4024 lines
106 KiB
C
4024 lines
106 KiB
C
/* Convert RTL to assembler code and output it, for GNU compiler.
|
||
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
|
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1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
|
||
|
||
This file is part of GCC.
|
||
|
||
GCC is free software; you can redistribute it and/or modify it under
|
||
the terms of the GNU General Public License as published by the Free
|
||
Software Foundation; either version 2, or (at your option) any later
|
||
version.
|
||
|
||
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
||
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GCC; see the file COPYING. If not, write to the Free
|
||
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|
||
02111-1307, USA. */
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||
|
||
/* $FreeBSD$ */
|
||
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||
/* This is the final pass of the compiler.
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It looks at the rtl code for a function and outputs assembler code.
|
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|
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Call `final_start_function' to output the assembler code for function entry,
|
||
`final' to output assembler code for some RTL code,
|
||
`final_end_function' to output assembler code for function exit.
|
||
If a function is compiled in several pieces, each piece is
|
||
output separately with `final'.
|
||
|
||
Some optimizations are also done at this level.
|
||
Move instructions that were made unnecessary by good register allocation
|
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are detected and omitted from the output. (Though most of these
|
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are removed by the last jump pass.)
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|
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Instructions to set the condition codes are omitted when it can be
|
||
seen that the condition codes already had the desired values.
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||
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||
In some cases it is sufficient if the inherited condition codes
|
||
have related values, but this may require the following insn
|
||
(the one that tests the condition codes) to be modified.
|
||
|
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The code for the function prologue and epilogue are generated
|
||
directly in assembler by the target functions function_prologue and
|
||
function_epilogue. Those instructions never exist as rtl. */
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||
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#include "config.h"
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||
#include "system.h"
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||
|
||
#include "tree.h"
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||
#include "rtl.h"
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||
#include "tm_p.h"
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||
#include "regs.h"
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||
#include "insn-config.h"
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||
#include "insn-attr.h"
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||
#include "recog.h"
|
||
#include "conditions.h"
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||
#include "flags.h"
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||
#include "real.h"
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||
#include "hard-reg-set.h"
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||
#include "output.h"
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||
#include "except.h"
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||
#include "function.h"
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||
#include "toplev.h"
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||
#include "reload.h"
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||
#include "intl.h"
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||
#include "basic-block.h"
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||
#include "target.h"
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||
#include "debug.h"
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||
#include "expr.h"
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||
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||
#ifdef XCOFF_DEBUGGING_INFO
|
||
#include "xcoffout.h" /* Needed for external data
|
||
declarations for e.g. AIX 4.x. */
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||
#endif
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||
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#if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
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||
#include "dwarf2out.h"
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||
#endif
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||
/* If we aren't using cc0, CC_STATUS_INIT shouldn't exist. So define a
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||
null default for it to save conditionalization later. */
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#ifndef CC_STATUS_INIT
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#define CC_STATUS_INIT
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#endif
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||
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||
/* How to start an assembler comment. */
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#ifndef ASM_COMMENT_START
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#define ASM_COMMENT_START ";#"
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||
#endif
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||
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/* Is the given character a logical line separator for the assembler? */
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||
#ifndef IS_ASM_LOGICAL_LINE_SEPARATOR
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#define IS_ASM_LOGICAL_LINE_SEPARATOR(C) ((C) == ';')
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#endif
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||
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||
#ifndef JUMP_TABLES_IN_TEXT_SECTION
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||
#define JUMP_TABLES_IN_TEXT_SECTION 0
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||
#endif
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||
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||
/* Last insn processed by final_scan_insn. */
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||
static rtx debug_insn;
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||
rtx current_output_insn;
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||
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||
/* Line number of last NOTE. */
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||
static int last_linenum;
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||
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||
/* Highest line number in current block. */
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||
static int high_block_linenum;
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||
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||
/* Likewise for function. */
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||
static int high_function_linenum;
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||
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||
/* Filename of last NOTE. */
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||
static const char *last_filename;
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/* Number of instrumented arcs when profile_arc_flag is set. */
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extern int count_instrumented_edges;
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||
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extern int length_unit_log; /* This is defined in insn-attrtab.c. */
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||
/* Nonzero while outputting an `asm' with operands.
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||
This means that inconsistencies are the user's fault, so don't abort.
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||
The precise value is the insn being output, to pass to error_for_asm. */
|
||
static rtx this_is_asm_operands;
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||
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||
/* Number of operands of this insn, for an `asm' with operands. */
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||
static unsigned int insn_noperands;
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||
|
||
/* Compare optimization flag. */
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||
|
||
static rtx last_ignored_compare = 0;
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||
|
||
/* Flag indicating this insn is the start of a new basic block. */
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||
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||
static int new_block = 1;
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||
|
||
/* Assign a unique number to each insn that is output.
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||
This can be used to generate unique local labels. */
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||
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static int insn_counter = 0;
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||
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||
#ifdef HAVE_cc0
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/* This variable contains machine-dependent flags (defined in tm.h)
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||
set and examined by output routines
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||
that describe how to interpret the condition codes properly. */
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||
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||
CC_STATUS cc_status;
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||
|
||
/* During output of an insn, this contains a copy of cc_status
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from before the insn. */
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||
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||
CC_STATUS cc_prev_status;
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||
#endif
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||
|
||
/* Indexed by hardware reg number, is 1 if that register is ever
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||
used in the current function.
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||
|
||
In life_analysis, or in stupid_life_analysis, this is set
|
||
up to record the hard regs used explicitly. Reload adds
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||
in the hard regs used for holding pseudo regs. Final uses
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||
it to generate the code in the function prologue and epilogue
|
||
to save and restore registers as needed. */
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||
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||
char regs_ever_live[FIRST_PSEUDO_REGISTER];
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||
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/* Nonzero means current function must be given a frame pointer.
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Set in stmt.c if anything is allocated on the stack there.
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Set in reload1.c if anything is allocated on the stack there. */
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||
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||
int frame_pointer_needed;
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||
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||
/* Number of unmatched NOTE_INSN_BLOCK_BEG notes we have seen. */
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||
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||
static int block_depth;
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||
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||
/* Nonzero if have enabled APP processing of our assembler output. */
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static int app_on;
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||
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/* If we are outputting an insn sequence, this contains the sequence rtx.
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Zero otherwise. */
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||
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||
rtx final_sequence;
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||
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#ifdef ASSEMBLER_DIALECT
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||
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/* Number of the assembler dialect to use, starting at 0. */
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||
static int dialect_number;
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||
#endif
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||
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||
/* Indexed by line number, nonzero if there is a note for that line. */
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||
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||
static char *line_note_exists;
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||
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||
#ifdef HAVE_conditional_execution
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||
/* Nonnull if the insn currently being emitted was a COND_EXEC pattern. */
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||
rtx current_insn_predicate;
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||
#endif
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||
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||
#ifdef HAVE_ATTR_length
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||
static int asm_insn_count PARAMS ((rtx));
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||
#endif
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static void profile_function PARAMS ((FILE *));
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static void profile_after_prologue PARAMS ((FILE *));
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||
static void notice_source_line PARAMS ((rtx));
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||
static rtx walk_alter_subreg PARAMS ((rtx *));
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||
static void output_asm_name PARAMS ((void));
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||
static tree get_mem_expr_from_op PARAMS ((rtx, int *));
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||
static void output_asm_operand_names PARAMS ((rtx *, int *, int));
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||
static void output_operand PARAMS ((rtx, int));
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||
#ifdef LEAF_REGISTERS
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static void leaf_renumber_regs PARAMS ((rtx));
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||
#endif
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||
#ifdef HAVE_cc0
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||
static int alter_cond PARAMS ((rtx));
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||
#endif
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#ifndef ADDR_VEC_ALIGN
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static int final_addr_vec_align PARAMS ((rtx));
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||
#endif
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||
#ifdef HAVE_ATTR_length
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||
static int align_fuzz PARAMS ((rtx, rtx, int, unsigned));
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||
#endif
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/* Initialize data in final at the beginning of a compilation. */
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||
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||
void
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||
init_final (filename)
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||
const char *filename ATTRIBUTE_UNUSED;
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||
{
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||
app_on = 0;
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final_sequence = 0;
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||
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||
#ifdef ASSEMBLER_DIALECT
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dialect_number = ASSEMBLER_DIALECT;
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||
#endif
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}
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/* Called at end of source file,
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to output the block-profiling table for this entire compilation. */
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void
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end_final (filename)
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||
const char *filename;
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||
{
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||
if (profile_arc_flag)
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||
{
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||
char name[20];
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||
int align = exact_log2 (BIGGEST_ALIGNMENT / BITS_PER_UNIT);
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int size, rounded;
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||
int long_bytes = LONG_TYPE_SIZE / BITS_PER_UNIT;
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||
int gcov_type_bytes = GCOV_TYPE_SIZE / BITS_PER_UNIT;
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int pointer_bytes = POINTER_SIZE / BITS_PER_UNIT;
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||
unsigned int align2 = LONG_TYPE_SIZE;
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size = gcov_type_bytes * count_instrumented_edges;
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rounded = size;
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||
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rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
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||
rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
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||
* (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
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||
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||
/* ??? This _really_ ought to be done with a structure layout
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||
and with assemble_constructor. If long_bytes != pointer_bytes
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||
we'll be emitting unaligned data at some point. */
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||
if (long_bytes != pointer_bytes)
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||
abort ();
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||
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||
data_section ();
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/* Output the main header, of 11 words:
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||
0: 1 if this file is initialized, else 0.
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||
1: address of file name (LPBX1).
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||
2: address of table of counts (LPBX2).
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||
3: number of counts in the table.
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||
4: always 0, for compatibility with Sun.
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||
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||
The following are GNU extensions:
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||
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||
5: address of table of start addrs of basic blocks (LPBX3).
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||
6: Number of bytes in this header.
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||
7: address of table of function names (LPBX4).
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8: address of table of line numbers (LPBX5) or 0.
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9: address of table of file names (LPBX6) or 0.
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||
10: space reserved for basic block profiling. */
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ASM_OUTPUT_ALIGN (asm_out_file, align);
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ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 0);
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/* Zero word. */
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assemble_integer (const0_rtx, long_bytes, align2, 1);
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||
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/* Address of filename. */
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ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 1);
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||
assemble_integer (gen_rtx_SYMBOL_REF (Pmode, name), pointer_bytes,
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align2, 1);
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||
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/* Address of count table. */
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||
ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 2);
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assemble_integer (gen_rtx_SYMBOL_REF (Pmode, name), pointer_bytes,
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align2, 1);
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||
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/* Count of the # of instrumented arcs. */
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||
assemble_integer (GEN_INT (count_instrumented_edges),
|
||
long_bytes, align2, 1);
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||
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||
/* Zero word (link field). */
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||
assemble_integer (const0_rtx, pointer_bytes, align2, 1);
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||
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assemble_integer (const0_rtx, pointer_bytes, align2, 1);
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||
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||
/* Byte count for extended structure. */
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||
assemble_integer (GEN_INT (11 * UNITS_PER_WORD), long_bytes, align2, 1);
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||
|
||
/* Address of function name table. */
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||
assemble_integer (const0_rtx, pointer_bytes, align2, 1);
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||
|
||
/* Address of line number and filename tables if debugging. */
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||
assemble_integer (const0_rtx, pointer_bytes, align2, 1);
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||
assemble_integer (const0_rtx, pointer_bytes, align2, 1);
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||
|
||
/* Space for extension ptr (link field). */
|
||
assemble_integer (const0_rtx, UNITS_PER_WORD, align2, 1);
|
||
|
||
/* Output the file name changing the suffix to .d for
|
||
Sun tcov compatibility. */
|
||
ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 1);
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||
{
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||
char *cwd = getpwd ();
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||
int len = strlen (filename) + strlen (cwd) + 1;
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||
char *data_file = (char *) alloca (len + 4);
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||
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||
strcpy (data_file, cwd);
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||
strcat (data_file, "/");
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||
strcat (data_file, filename);
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||
strip_off_ending (data_file, len);
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||
strcat (data_file, ".da");
|
||
assemble_string (data_file, strlen (data_file) + 1);
|
||
}
|
||
|
||
/* Make space for the table of counts. */
|
||
if (size == 0)
|
||
{
|
||
/* Realign data section. */
|
||
ASM_OUTPUT_ALIGN (asm_out_file, align);
|
||
ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LPBX", 2);
|
||
if (size != 0)
|
||
assemble_zeros (size);
|
||
}
|
||
else
|
||
{
|
||
ASM_GENERATE_INTERNAL_LABEL (name, "LPBX", 2);
|
||
#ifdef ASM_OUTPUT_SHARED_LOCAL
|
||
if (flag_shared_data)
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||
ASM_OUTPUT_SHARED_LOCAL (asm_out_file, name, size, rounded);
|
||
else
|
||
#endif
|
||
#ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
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||
ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name,
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||
size, BIGGEST_ALIGNMENT);
|
||
#else
|
||
#ifdef ASM_OUTPUT_ALIGNED_LOCAL
|
||
ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size,
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||
BIGGEST_ALIGNMENT);
|
||
#else
|
||
ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
|
||
#endif
|
||
#endif
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Default target function prologue and epilogue assembler output.
|
||
|
||
If not overridden for epilogue code, then the function body itself
|
||
contains return instructions wherever needed. */
|
||
void
|
||
default_function_pro_epilogue (file, size)
|
||
FILE *file ATTRIBUTE_UNUSED;
|
||
HOST_WIDE_INT size ATTRIBUTE_UNUSED;
|
||
{
|
||
}
|
||
|
||
/* Default target hook that outputs nothing to a stream. */
|
||
void
|
||
no_asm_to_stream (file)
|
||
FILE *file ATTRIBUTE_UNUSED;
|
||
{
|
||
}
|
||
|
||
/* Enable APP processing of subsequent output.
|
||
Used before the output from an `asm' statement. */
|
||
|
||
void
|
||
app_enable ()
|
||
{
|
||
if (! app_on)
|
||
{
|
||
fputs (ASM_APP_ON, asm_out_file);
|
||
app_on = 1;
|
||
}
|
||
}
|
||
|
||
/* Disable APP processing of subsequent output.
|
||
Called from varasm.c before most kinds of output. */
|
||
|
||
void
|
||
app_disable ()
|
||
{
|
||
if (app_on)
|
||
{
|
||
fputs (ASM_APP_OFF, asm_out_file);
|
||
app_on = 0;
|
||
}
|
||
}
|
||
|
||
/* Return the number of slots filled in the current
|
||
delayed branch sequence (we don't count the insn needing the
|
||
delay slot). Zero if not in a delayed branch sequence. */
|
||
|
||
#ifdef DELAY_SLOTS
|
||
int
|
||
dbr_sequence_length ()
|
||
{
|
||
if (final_sequence != 0)
|
||
return XVECLEN (final_sequence, 0) - 1;
|
||
else
|
||
return 0;
|
||
}
|
||
#endif
|
||
|
||
/* The next two pages contain routines used to compute the length of an insn
|
||
and to shorten branches. */
|
||
|
||
/* Arrays for insn lengths, and addresses. The latter is referenced by
|
||
`insn_current_length'. */
|
||
|
||
static int *insn_lengths;
|
||
|
||
#ifdef HAVE_ATTR_length
|
||
varray_type insn_addresses_;
|
||
#endif
|
||
|
||
/* Max uid for which the above arrays are valid. */
|
||
static int insn_lengths_max_uid;
|
||
|
||
/* Address of insn being processed. Used by `insn_current_length'. */
|
||
int insn_current_address;
|
||
|
||
/* Address of insn being processed in previous iteration. */
|
||
int insn_last_address;
|
||
|
||
/* known invariant alignment of insn being processed. */
|
||
int insn_current_align;
|
||
|
||
/* After shorten_branches, for any insn, uid_align[INSN_UID (insn)]
|
||
gives the next following alignment insn that increases the known
|
||
alignment, or NULL_RTX if there is no such insn.
|
||
For any alignment obtained this way, we can again index uid_align with
|
||
its uid to obtain the next following align that in turn increases the
|
||
alignment, till we reach NULL_RTX; the sequence obtained this way
|
||
for each insn we'll call the alignment chain of this insn in the following
|
||
comments. */
|
||
|
||
struct label_alignment
|
||
{
|
||
short alignment;
|
||
short max_skip;
|
||
};
|
||
|
||
static rtx *uid_align;
|
||
static int *uid_shuid;
|
||
static struct label_alignment *label_align;
|
||
|
||
/* Indicate that branch shortening hasn't yet been done. */
|
||
|
||
void
|
||
init_insn_lengths ()
|
||
{
|
||
if (uid_shuid)
|
||
{
|
||
free (uid_shuid);
|
||
uid_shuid = 0;
|
||
}
|
||
if (insn_lengths)
|
||
{
|
||
free (insn_lengths);
|
||
insn_lengths = 0;
|
||
insn_lengths_max_uid = 0;
|
||
}
|
||
#ifdef HAVE_ATTR_length
|
||
INSN_ADDRESSES_FREE ();
|
||
#endif
|
||
if (uid_align)
|
||
{
|
||
free (uid_align);
|
||
uid_align = 0;
|
||
}
|
||
}
|
||
|
||
/* Obtain the current length of an insn. If branch shortening has been done,
|
||
get its actual length. Otherwise, get its maximum length. */
|
||
|
||
int
|
||
get_attr_length (insn)
|
||
rtx insn ATTRIBUTE_UNUSED;
|
||
{
|
||
#ifdef HAVE_ATTR_length
|
||
rtx body;
|
||
int i;
|
||
int length = 0;
|
||
|
||
if (insn_lengths_max_uid > INSN_UID (insn))
|
||
return insn_lengths[INSN_UID (insn)];
|
||
else
|
||
switch (GET_CODE (insn))
|
||
{
|
||
case NOTE:
|
||
case BARRIER:
|
||
case CODE_LABEL:
|
||
return 0;
|
||
|
||
case CALL_INSN:
|
||
length = insn_default_length (insn);
|
||
break;
|
||
|
||
case JUMP_INSN:
|
||
body = PATTERN (insn);
|
||
if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
|
||
{
|
||
/* Alignment is machine-dependent and should be handled by
|
||
ADDR_VEC_ALIGN. */
|
||
}
|
||
else
|
||
length = insn_default_length (insn);
|
||
break;
|
||
|
||
case INSN:
|
||
body = PATTERN (insn);
|
||
if (GET_CODE (body) == USE || GET_CODE (body) == CLOBBER)
|
||
return 0;
|
||
|
||
else if (GET_CODE (body) == ASM_INPUT || asm_noperands (body) >= 0)
|
||
length = asm_insn_count (body) * insn_default_length (insn);
|
||
else if (GET_CODE (body) == SEQUENCE)
|
||
for (i = 0; i < XVECLEN (body, 0); i++)
|
||
length += get_attr_length (XVECEXP (body, 0, i));
|
||
else
|
||
length = insn_default_length (insn);
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
#ifdef ADJUST_INSN_LENGTH
|
||
ADJUST_INSN_LENGTH (insn, length);
|
||
#endif
|
||
return length;
|
||
#else /* not HAVE_ATTR_length */
|
||
return 0;
|
||
#endif /* not HAVE_ATTR_length */
|
||
}
|
||
|
||
/* Code to handle alignment inside shorten_branches. */
|
||
|
||
/* Here is an explanation how the algorithm in align_fuzz can give
|
||
proper results:
|
||
|
||
Call a sequence of instructions beginning with alignment point X
|
||
and continuing until the next alignment point `block X'. When `X'
|
||
is used in an expression, it means the alignment value of the
|
||
alignment point.
|
||
|
||
Call the distance between the start of the first insn of block X, and
|
||
the end of the last insn of block X `IX', for the `inner size of X'.
|
||
This is clearly the sum of the instruction lengths.
|
||
|
||
Likewise with the next alignment-delimited block following X, which we
|
||
shall call block Y.
|
||
|
||
Call the distance between the start of the first insn of block X, and
|
||
the start of the first insn of block Y `OX', for the `outer size of X'.
|
||
|
||
The estimated padding is then OX - IX.
|
||
|
||
OX can be safely estimated as
|
||
|
||
if (X >= Y)
|
||
OX = round_up(IX, Y)
|
||
else
|
||
OX = round_up(IX, X) + Y - X
|
||
|
||
Clearly est(IX) >= real(IX), because that only depends on the
|
||
instruction lengths, and those being overestimated is a given.
|
||
|
||
Clearly round_up(foo, Z) >= round_up(bar, Z) if foo >= bar, so
|
||
we needn't worry about that when thinking about OX.
|
||
|
||
When X >= Y, the alignment provided by Y adds no uncertainty factor
|
||
for branch ranges starting before X, so we can just round what we have.
|
||
But when X < Y, we don't know anything about the, so to speak,
|
||
`middle bits', so we have to assume the worst when aligning up from an
|
||
address mod X to one mod Y, which is Y - X. */
|
||
|
||
#ifndef LABEL_ALIGN
|
||
#define LABEL_ALIGN(LABEL) align_labels_log
|
||
#endif
|
||
|
||
#ifndef LABEL_ALIGN_MAX_SKIP
|
||
#define LABEL_ALIGN_MAX_SKIP align_labels_max_skip
|
||
#endif
|
||
|
||
#ifndef LOOP_ALIGN
|
||
#define LOOP_ALIGN(LABEL) align_loops_log
|
||
#endif
|
||
|
||
#ifndef LOOP_ALIGN_MAX_SKIP
|
||
#define LOOP_ALIGN_MAX_SKIP align_loops_max_skip
|
||
#endif
|
||
|
||
#ifndef LABEL_ALIGN_AFTER_BARRIER
|
||
#define LABEL_ALIGN_AFTER_BARRIER(LABEL) 0
|
||
#endif
|
||
|
||
#ifndef LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP
|
||
#define LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP 0
|
||
#endif
|
||
|
||
#ifndef JUMP_ALIGN
|
||
#define JUMP_ALIGN(LABEL) align_jumps_log
|
||
#endif
|
||
|
||
#ifndef JUMP_ALIGN_MAX_SKIP
|
||
#define JUMP_ALIGN_MAX_SKIP align_jumps_max_skip
|
||
#endif
|
||
|
||
#ifndef ADDR_VEC_ALIGN
|
||
static int
|
||
final_addr_vec_align (addr_vec)
|
||
rtx addr_vec;
|
||
{
|
||
int align = GET_MODE_SIZE (GET_MODE (PATTERN (addr_vec)));
|
||
|
||
if (align > BIGGEST_ALIGNMENT / BITS_PER_UNIT)
|
||
align = BIGGEST_ALIGNMENT / BITS_PER_UNIT;
|
||
return exact_log2 (align);
|
||
|
||
}
|
||
|
||
#define ADDR_VEC_ALIGN(ADDR_VEC) final_addr_vec_align (ADDR_VEC)
|
||
#endif
|
||
|
||
#ifndef INSN_LENGTH_ALIGNMENT
|
||
#define INSN_LENGTH_ALIGNMENT(INSN) length_unit_log
|
||
#endif
|
||
|
||
#define INSN_SHUID(INSN) (uid_shuid[INSN_UID (INSN)])
|
||
|
||
static int min_labelno, max_labelno;
|
||
|
||
#define LABEL_TO_ALIGNMENT(LABEL) \
|
||
(label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].alignment)
|
||
|
||
#define LABEL_TO_MAX_SKIP(LABEL) \
|
||
(label_align[CODE_LABEL_NUMBER (LABEL) - min_labelno].max_skip)
|
||
|
||
/* For the benefit of port specific code do this also as a function. */
|
||
|
||
int
|
||
label_to_alignment (label)
|
||
rtx label;
|
||
{
|
||
return LABEL_TO_ALIGNMENT (label);
|
||
}
|
||
|
||
#ifdef HAVE_ATTR_length
|
||
/* The differences in addresses
|
||
between a branch and its target might grow or shrink depending on
|
||
the alignment the start insn of the range (the branch for a forward
|
||
branch or the label for a backward branch) starts out on; if these
|
||
differences are used naively, they can even oscillate infinitely.
|
||
We therefore want to compute a 'worst case' address difference that
|
||
is independent of the alignment the start insn of the range end
|
||
up on, and that is at least as large as the actual difference.
|
||
The function align_fuzz calculates the amount we have to add to the
|
||
naively computed difference, by traversing the part of the alignment
|
||
chain of the start insn of the range that is in front of the end insn
|
||
of the range, and considering for each alignment the maximum amount
|
||
that it might contribute to a size increase.
|
||
|
||
For casesi tables, we also want to know worst case minimum amounts of
|
||
address difference, in case a machine description wants to introduce
|
||
some common offset that is added to all offsets in a table.
|
||
For this purpose, align_fuzz with a growth argument of 0 computes the
|
||
appropriate adjustment. */
|
||
|
||
/* Compute the maximum delta by which the difference of the addresses of
|
||
START and END might grow / shrink due to a different address for start
|
||
which changes the size of alignment insns between START and END.
|
||
KNOWN_ALIGN_LOG is the alignment known for START.
|
||
GROWTH should be ~0 if the objective is to compute potential code size
|
||
increase, and 0 if the objective is to compute potential shrink.
|
||
The return value is undefined for any other value of GROWTH. */
|
||
|
||
static int
|
||
align_fuzz (start, end, known_align_log, growth)
|
||
rtx start, end;
|
||
int known_align_log;
|
||
unsigned growth;
|
||
{
|
||
int uid = INSN_UID (start);
|
||
rtx align_label;
|
||
int known_align = 1 << known_align_log;
|
||
int end_shuid = INSN_SHUID (end);
|
||
int fuzz = 0;
|
||
|
||
for (align_label = uid_align[uid]; align_label; align_label = uid_align[uid])
|
||
{
|
||
int align_addr, new_align;
|
||
|
||
uid = INSN_UID (align_label);
|
||
align_addr = INSN_ADDRESSES (uid) - insn_lengths[uid];
|
||
if (uid_shuid[uid] > end_shuid)
|
||
break;
|
||
known_align_log = LABEL_TO_ALIGNMENT (align_label);
|
||
new_align = 1 << known_align_log;
|
||
if (new_align < known_align)
|
||
continue;
|
||
fuzz += (-align_addr ^ growth) & (new_align - known_align);
|
||
known_align = new_align;
|
||
}
|
||
return fuzz;
|
||
}
|
||
|
||
/* Compute a worst-case reference address of a branch so that it
|
||
can be safely used in the presence of aligned labels. Since the
|
||
size of the branch itself is unknown, the size of the branch is
|
||
not included in the range. I.e. for a forward branch, the reference
|
||
address is the end address of the branch as known from the previous
|
||
branch shortening pass, minus a value to account for possible size
|
||
increase due to alignment. For a backward branch, it is the start
|
||
address of the branch as known from the current pass, plus a value
|
||
to account for possible size increase due to alignment.
|
||
NB.: Therefore, the maximum offset allowed for backward branches needs
|
||
to exclude the branch size. */
|
||
|
||
int
|
||
insn_current_reference_address (branch)
|
||
rtx branch;
|
||
{
|
||
rtx dest, seq;
|
||
int seq_uid;
|
||
|
||
if (! INSN_ADDRESSES_SET_P ())
|
||
return 0;
|
||
|
||
seq = NEXT_INSN (PREV_INSN (branch));
|
||
seq_uid = INSN_UID (seq);
|
||
if (GET_CODE (branch) != JUMP_INSN)
|
||
/* This can happen for example on the PA; the objective is to know the
|
||
offset to address something in front of the start of the function.
|
||
Thus, we can treat it like a backward branch.
|
||
We assume here that FUNCTION_BOUNDARY / BITS_PER_UNIT is larger than
|
||
any alignment we'd encounter, so we skip the call to align_fuzz. */
|
||
return insn_current_address;
|
||
dest = JUMP_LABEL (branch);
|
||
|
||
/* BRANCH has no proper alignment chain set, so use SEQ.
|
||
BRANCH also has no INSN_SHUID. */
|
||
if (INSN_SHUID (seq) < INSN_SHUID (dest))
|
||
{
|
||
/* Forward branch. */
|
||
return (insn_last_address + insn_lengths[seq_uid]
|
||
- align_fuzz (seq, dest, length_unit_log, ~0));
|
||
}
|
||
else
|
||
{
|
||
/* Backward branch. */
|
||
return (insn_current_address
|
||
+ align_fuzz (dest, seq, length_unit_log, ~0));
|
||
}
|
||
}
|
||
#endif /* HAVE_ATTR_length */
|
||
|
||
void
|
||
compute_alignments ()
|
||
{
|
||
int i;
|
||
int log, max_skip, max_log;
|
||
|
||
if (label_align)
|
||
{
|
||
free (label_align);
|
||
label_align = 0;
|
||
}
|
||
|
||
max_labelno = max_label_num ();
|
||
min_labelno = get_first_label_num ();
|
||
label_align = (struct label_alignment *)
|
||
xcalloc (max_labelno - min_labelno + 1, sizeof (struct label_alignment));
|
||
|
||
/* If not optimizing or optimizing for size, don't assign any alignments. */
|
||
if (! optimize || optimize_size)
|
||
return;
|
||
|
||
for (i = 0; i < n_basic_blocks; i++)
|
||
{
|
||
basic_block bb = BASIC_BLOCK (i);
|
||
rtx label = bb->head;
|
||
int fallthru_frequency = 0, branch_frequency = 0, has_fallthru = 0;
|
||
edge e;
|
||
|
||
if (GET_CODE (label) != CODE_LABEL)
|
||
continue;
|
||
max_log = LABEL_ALIGN (label);
|
||
max_skip = LABEL_ALIGN_MAX_SKIP;
|
||
|
||
for (e = bb->pred; e; e = e->pred_next)
|
||
{
|
||
if (e->flags & EDGE_FALLTHRU)
|
||
has_fallthru = 1, fallthru_frequency += EDGE_FREQUENCY (e);
|
||
else
|
||
branch_frequency += EDGE_FREQUENCY (e);
|
||
}
|
||
|
||
/* There are two purposes to align block with no fallthru incoming edge:
|
||
1) to avoid fetch stalls when branch destination is near cache boundary
|
||
2) to improve cache efficiency in case the previous block is not executed
|
||
(so it does not need to be in the cache).
|
||
|
||
We to catch first case, we align frequently executed blocks.
|
||
To catch the second, we align blocks that are executed more frequently
|
||
than the predecessor and the predecessor is likely to not be executed
|
||
when function is called. */
|
||
|
||
if (!has_fallthru
|
||
&& (branch_frequency > BB_FREQ_MAX / 10
|
||
|| (bb->frequency > BASIC_BLOCK (i - 1)->frequency * 10
|
||
&& (BASIC_BLOCK (i - 1)->frequency
|
||
<= ENTRY_BLOCK_PTR->frequency / 2))))
|
||
{
|
||
log = JUMP_ALIGN (label);
|
||
if (max_log < log)
|
||
{
|
||
max_log = log;
|
||
max_skip = JUMP_ALIGN_MAX_SKIP;
|
||
}
|
||
}
|
||
/* In case block is frequent and reached mostly by non-fallthru edge,
|
||
align it. It is most likely an first block of loop. */
|
||
if (has_fallthru
|
||
&& branch_frequency + fallthru_frequency > BB_FREQ_MAX / 10
|
||
&& branch_frequency > fallthru_frequency * 5)
|
||
{
|
||
log = LOOP_ALIGN (label);
|
||
if (max_log < log)
|
||
{
|
||
max_log = log;
|
||
max_skip = LOOP_ALIGN_MAX_SKIP;
|
||
}
|
||
}
|
||
LABEL_TO_ALIGNMENT (label) = max_log;
|
||
LABEL_TO_MAX_SKIP (label) = max_skip;
|
||
}
|
||
}
|
||
|
||
/* Make a pass over all insns and compute their actual lengths by shortening
|
||
any branches of variable length if possible. */
|
||
|
||
/* Give a default value for the lowest address in a function. */
|
||
|
||
#ifndef FIRST_INSN_ADDRESS
|
||
#define FIRST_INSN_ADDRESS 0
|
||
#endif
|
||
|
||
/* shorten_branches might be called multiple times: for example, the SH
|
||
port splits out-of-range conditional branches in MACHINE_DEPENDENT_REORG.
|
||
In order to do this, it needs proper length information, which it obtains
|
||
by calling shorten_branches. This cannot be collapsed with
|
||
shorten_branches itself into a single pass unless we also want to integrate
|
||
reorg.c, since the branch splitting exposes new instructions with delay
|
||
slots. */
|
||
|
||
void
|
||
shorten_branches (first)
|
||
rtx first ATTRIBUTE_UNUSED;
|
||
{
|
||
rtx insn;
|
||
int max_uid;
|
||
int i;
|
||
int max_log;
|
||
int max_skip;
|
||
#ifdef HAVE_ATTR_length
|
||
#define MAX_CODE_ALIGN 16
|
||
rtx seq;
|
||
int something_changed = 1;
|
||
char *varying_length;
|
||
rtx body;
|
||
int uid;
|
||
rtx align_tab[MAX_CODE_ALIGN];
|
||
|
||
#endif
|
||
|
||
/* Compute maximum UID and allocate label_align / uid_shuid. */
|
||
max_uid = get_max_uid ();
|
||
|
||
uid_shuid = (int *) xmalloc (max_uid * sizeof *uid_shuid);
|
||
|
||
if (max_labelno != max_label_num ())
|
||
{
|
||
int old = max_labelno;
|
||
int n_labels;
|
||
int n_old_labels;
|
||
|
||
max_labelno = max_label_num ();
|
||
|
||
n_labels = max_labelno - min_labelno + 1;
|
||
n_old_labels = old - min_labelno + 1;
|
||
|
||
label_align = (struct label_alignment *) xrealloc
|
||
(label_align, n_labels * sizeof (struct label_alignment));
|
||
|
||
/* Range of labels grows monotonically in the function. Abort here
|
||
means that the initialization of array got lost. */
|
||
if (n_old_labels > n_labels)
|
||
abort ();
|
||
|
||
memset (label_align + n_old_labels, 0,
|
||
(n_labels - n_old_labels) * sizeof (struct label_alignment));
|
||
}
|
||
|
||
/* Initialize label_align and set up uid_shuid to be strictly
|
||
monotonically rising with insn order. */
|
||
/* We use max_log here to keep track of the maximum alignment we want to
|
||
impose on the next CODE_LABEL (or the current one if we are processing
|
||
the CODE_LABEL itself). */
|
||
|
||
max_log = 0;
|
||
max_skip = 0;
|
||
|
||
for (insn = get_insns (), i = 1; insn; insn = NEXT_INSN (insn))
|
||
{
|
||
int log;
|
||
|
||
INSN_SHUID (insn) = i++;
|
||
if (INSN_P (insn))
|
||
{
|
||
/* reorg might make the first insn of a loop being run once only,
|
||
and delete the label in front of it. Then we want to apply
|
||
the loop alignment to the new label created by reorg, which
|
||
is separated by the former loop start insn from the
|
||
NOTE_INSN_LOOP_BEG. */
|
||
}
|
||
else if (GET_CODE (insn) == CODE_LABEL)
|
||
{
|
||
rtx next;
|
||
|
||
/* Merge in alignments computed by compute_alignments. */
|
||
log = LABEL_TO_ALIGNMENT (insn);
|
||
if (max_log < log)
|
||
{
|
||
max_log = log;
|
||
max_skip = LABEL_TO_MAX_SKIP (insn);
|
||
}
|
||
|
||
log = LABEL_ALIGN (insn);
|
||
if (max_log < log)
|
||
{
|
||
max_log = log;
|
||
max_skip = LABEL_ALIGN_MAX_SKIP;
|
||
}
|
||
next = NEXT_INSN (insn);
|
||
/* ADDR_VECs only take room if read-only data goes into the text
|
||
section. */
|
||
if (JUMP_TABLES_IN_TEXT_SECTION
|
||
#if !defined(READONLY_DATA_SECTION)
|
||
|| 1
|
||
#endif
|
||
)
|
||
if (next && GET_CODE (next) == JUMP_INSN)
|
||
{
|
||
rtx nextbody = PATTERN (next);
|
||
if (GET_CODE (nextbody) == ADDR_VEC
|
||
|| GET_CODE (nextbody) == ADDR_DIFF_VEC)
|
||
{
|
||
log = ADDR_VEC_ALIGN (next);
|
||
if (max_log < log)
|
||
{
|
||
max_log = log;
|
||
max_skip = LABEL_ALIGN_MAX_SKIP;
|
||
}
|
||
}
|
||
}
|
||
LABEL_TO_ALIGNMENT (insn) = max_log;
|
||
LABEL_TO_MAX_SKIP (insn) = max_skip;
|
||
max_log = 0;
|
||
max_skip = 0;
|
||
}
|
||
else if (GET_CODE (insn) == BARRIER)
|
||
{
|
||
rtx label;
|
||
|
||
for (label = insn; label && ! INSN_P (label);
|
||
label = NEXT_INSN (label))
|
||
if (GET_CODE (label) == CODE_LABEL)
|
||
{
|
||
log = LABEL_ALIGN_AFTER_BARRIER (insn);
|
||
if (max_log < log)
|
||
{
|
||
max_log = log;
|
||
max_skip = LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
#ifdef HAVE_ATTR_length
|
||
|
||
/* Allocate the rest of the arrays. */
|
||
insn_lengths = (int *) xmalloc (max_uid * sizeof (*insn_lengths));
|
||
insn_lengths_max_uid = max_uid;
|
||
/* Syntax errors can lead to labels being outside of the main insn stream.
|
||
Initialize insn_addresses, so that we get reproducible results. */
|
||
INSN_ADDRESSES_ALLOC (max_uid);
|
||
|
||
varying_length = (char *) xcalloc (max_uid, sizeof (char));
|
||
|
||
/* Initialize uid_align. We scan instructions
|
||
from end to start, and keep in align_tab[n] the last seen insn
|
||
that does an alignment of at least n+1, i.e. the successor
|
||
in the alignment chain for an insn that does / has a known
|
||
alignment of n. */
|
||
uid_align = (rtx *) xcalloc (max_uid, sizeof *uid_align);
|
||
|
||
for (i = MAX_CODE_ALIGN; --i >= 0;)
|
||
align_tab[i] = NULL_RTX;
|
||
seq = get_last_insn ();
|
||
for (; seq; seq = PREV_INSN (seq))
|
||
{
|
||
int uid = INSN_UID (seq);
|
||
int log;
|
||
log = (GET_CODE (seq) == CODE_LABEL ? LABEL_TO_ALIGNMENT (seq) : 0);
|
||
uid_align[uid] = align_tab[0];
|
||
if (log)
|
||
{
|
||
/* Found an alignment label. */
|
||
uid_align[uid] = align_tab[log];
|
||
for (i = log - 1; i >= 0; i--)
|
||
align_tab[i] = seq;
|
||
}
|
||
}
|
||
#ifdef CASE_VECTOR_SHORTEN_MODE
|
||
if (optimize)
|
||
{
|
||
/* Look for ADDR_DIFF_VECs, and initialize their minimum and maximum
|
||
label fields. */
|
||
|
||
int min_shuid = INSN_SHUID (get_insns ()) - 1;
|
||
int max_shuid = INSN_SHUID (get_last_insn ()) + 1;
|
||
int rel;
|
||
|
||
for (insn = first; insn != 0; insn = NEXT_INSN (insn))
|
||
{
|
||
rtx min_lab = NULL_RTX, max_lab = NULL_RTX, pat;
|
||
int len, i, min, max, insn_shuid;
|
||
int min_align;
|
||
addr_diff_vec_flags flags;
|
||
|
||
if (GET_CODE (insn) != JUMP_INSN
|
||
|| GET_CODE (PATTERN (insn)) != ADDR_DIFF_VEC)
|
||
continue;
|
||
pat = PATTERN (insn);
|
||
len = XVECLEN (pat, 1);
|
||
if (len <= 0)
|
||
abort ();
|
||
min_align = MAX_CODE_ALIGN;
|
||
for (min = max_shuid, max = min_shuid, i = len - 1; i >= 0; i--)
|
||
{
|
||
rtx lab = XEXP (XVECEXP (pat, 1, i), 0);
|
||
int shuid = INSN_SHUID (lab);
|
||
if (shuid < min)
|
||
{
|
||
min = shuid;
|
||
min_lab = lab;
|
||
}
|
||
if (shuid > max)
|
||
{
|
||
max = shuid;
|
||
max_lab = lab;
|
||
}
|
||
if (min_align > LABEL_TO_ALIGNMENT (lab))
|
||
min_align = LABEL_TO_ALIGNMENT (lab);
|
||
}
|
||
XEXP (pat, 2) = gen_rtx_LABEL_REF (VOIDmode, min_lab);
|
||
XEXP (pat, 3) = gen_rtx_LABEL_REF (VOIDmode, max_lab);
|
||
insn_shuid = INSN_SHUID (insn);
|
||
rel = INSN_SHUID (XEXP (XEXP (pat, 0), 0));
|
||
flags.min_align = min_align;
|
||
flags.base_after_vec = rel > insn_shuid;
|
||
flags.min_after_vec = min > insn_shuid;
|
||
flags.max_after_vec = max > insn_shuid;
|
||
flags.min_after_base = min > rel;
|
||
flags.max_after_base = max > rel;
|
||
ADDR_DIFF_VEC_FLAGS (pat) = flags;
|
||
}
|
||
}
|
||
#endif /* CASE_VECTOR_SHORTEN_MODE */
|
||
|
||
/* Compute initial lengths, addresses, and varying flags for each insn. */
|
||
for (insn_current_address = FIRST_INSN_ADDRESS, insn = first;
|
||
insn != 0;
|
||
insn_current_address += insn_lengths[uid], insn = NEXT_INSN (insn))
|
||
{
|
||
uid = INSN_UID (insn);
|
||
|
||
insn_lengths[uid] = 0;
|
||
|
||
if (GET_CODE (insn) == CODE_LABEL)
|
||
{
|
||
int log = LABEL_TO_ALIGNMENT (insn);
|
||
if (log)
|
||
{
|
||
int align = 1 << log;
|
||
int new_address = (insn_current_address + align - 1) & -align;
|
||
insn_lengths[uid] = new_address - insn_current_address;
|
||
}
|
||
}
|
||
|
||
INSN_ADDRESSES (uid) = insn_current_address;
|
||
|
||
if (GET_CODE (insn) == NOTE || GET_CODE (insn) == BARRIER
|
||
|| GET_CODE (insn) == CODE_LABEL)
|
||
continue;
|
||
if (INSN_DELETED_P (insn))
|
||
continue;
|
||
|
||
body = PATTERN (insn);
|
||
if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
|
||
{
|
||
/* This only takes room if read-only data goes into the text
|
||
section. */
|
||
if (JUMP_TABLES_IN_TEXT_SECTION
|
||
#if !defined(READONLY_DATA_SECTION)
|
||
|| 1
|
||
#endif
|
||
)
|
||
insn_lengths[uid] = (XVECLEN (body,
|
||
GET_CODE (body) == ADDR_DIFF_VEC)
|
||
* GET_MODE_SIZE (GET_MODE (body)));
|
||
/* Alignment is handled by ADDR_VEC_ALIGN. */
|
||
}
|
||
else if (GET_CODE (body) == ASM_INPUT || asm_noperands (body) >= 0)
|
||
insn_lengths[uid] = asm_insn_count (body) * insn_default_length (insn);
|
||
else if (GET_CODE (body) == SEQUENCE)
|
||
{
|
||
int i;
|
||
int const_delay_slots;
|
||
#ifdef DELAY_SLOTS
|
||
const_delay_slots = const_num_delay_slots (XVECEXP (body, 0, 0));
|
||
#else
|
||
const_delay_slots = 0;
|
||
#endif
|
||
/* Inside a delay slot sequence, we do not do any branch shortening
|
||
if the shortening could change the number of delay slots
|
||
of the branch. */
|
||
for (i = 0; i < XVECLEN (body, 0); i++)
|
||
{
|
||
rtx inner_insn = XVECEXP (body, 0, i);
|
||
int inner_uid = INSN_UID (inner_insn);
|
||
int inner_length;
|
||
|
||
if (GET_CODE (body) == ASM_INPUT
|
||
|| asm_noperands (PATTERN (XVECEXP (body, 0, i))) >= 0)
|
||
inner_length = (asm_insn_count (PATTERN (inner_insn))
|
||
* insn_default_length (inner_insn));
|
||
else
|
||
inner_length = insn_default_length (inner_insn);
|
||
|
||
insn_lengths[inner_uid] = inner_length;
|
||
if (const_delay_slots)
|
||
{
|
||
if ((varying_length[inner_uid]
|
||
= insn_variable_length_p (inner_insn)) != 0)
|
||
varying_length[uid] = 1;
|
||
INSN_ADDRESSES (inner_uid) = (insn_current_address
|
||
+ insn_lengths[uid]);
|
||
}
|
||
else
|
||
varying_length[inner_uid] = 0;
|
||
insn_lengths[uid] += inner_length;
|
||
}
|
||
}
|
||
else if (GET_CODE (body) != USE && GET_CODE (body) != CLOBBER)
|
||
{
|
||
insn_lengths[uid] = insn_default_length (insn);
|
||
varying_length[uid] = insn_variable_length_p (insn);
|
||
}
|
||
|
||
/* If needed, do any adjustment. */
|
||
#ifdef ADJUST_INSN_LENGTH
|
||
ADJUST_INSN_LENGTH (insn, insn_lengths[uid]);
|
||
if (insn_lengths[uid] < 0)
|
||
fatal_insn ("negative insn length", insn);
|
||
#endif
|
||
}
|
||
|
||
/* Now loop over all the insns finding varying length insns. For each,
|
||
get the current insn length. If it has changed, reflect the change.
|
||
When nothing changes for a full pass, we are done. */
|
||
|
||
while (something_changed)
|
||
{
|
||
something_changed = 0;
|
||
insn_current_align = MAX_CODE_ALIGN - 1;
|
||
for (insn_current_address = FIRST_INSN_ADDRESS, insn = first;
|
||
insn != 0;
|
||
insn = NEXT_INSN (insn))
|
||
{
|
||
int new_length;
|
||
#ifdef ADJUST_INSN_LENGTH
|
||
int tmp_length;
|
||
#endif
|
||
int length_align;
|
||
|
||
uid = INSN_UID (insn);
|
||
|
||
if (GET_CODE (insn) == CODE_LABEL)
|
||
{
|
||
int log = LABEL_TO_ALIGNMENT (insn);
|
||
if (log > insn_current_align)
|
||
{
|
||
int align = 1 << log;
|
||
int new_address= (insn_current_address + align - 1) & -align;
|
||
insn_lengths[uid] = new_address - insn_current_address;
|
||
insn_current_align = log;
|
||
insn_current_address = new_address;
|
||
}
|
||
else
|
||
insn_lengths[uid] = 0;
|
||
INSN_ADDRESSES (uid) = insn_current_address;
|
||
continue;
|
||
}
|
||
|
||
length_align = INSN_LENGTH_ALIGNMENT (insn);
|
||
if (length_align < insn_current_align)
|
||
insn_current_align = length_align;
|
||
|
||
insn_last_address = INSN_ADDRESSES (uid);
|
||
INSN_ADDRESSES (uid) = insn_current_address;
|
||
|
||
#ifdef CASE_VECTOR_SHORTEN_MODE
|
||
if (optimize && GET_CODE (insn) == JUMP_INSN
|
||
&& GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC)
|
||
{
|
||
rtx body = PATTERN (insn);
|
||
int old_length = insn_lengths[uid];
|
||
rtx rel_lab = XEXP (XEXP (body, 0), 0);
|
||
rtx min_lab = XEXP (XEXP (body, 2), 0);
|
||
rtx max_lab = XEXP (XEXP (body, 3), 0);
|
||
int rel_addr = INSN_ADDRESSES (INSN_UID (rel_lab));
|
||
int min_addr = INSN_ADDRESSES (INSN_UID (min_lab));
|
||
int max_addr = INSN_ADDRESSES (INSN_UID (max_lab));
|
||
rtx prev;
|
||
int rel_align = 0;
|
||
addr_diff_vec_flags flags;
|
||
|
||
/* Avoid automatic aggregate initialization. */
|
||
flags = ADDR_DIFF_VEC_FLAGS (body);
|
||
|
||
/* Try to find a known alignment for rel_lab. */
|
||
for (prev = rel_lab;
|
||
prev
|
||
&& ! insn_lengths[INSN_UID (prev)]
|
||
&& ! (varying_length[INSN_UID (prev)] & 1);
|
||
prev = PREV_INSN (prev))
|
||
if (varying_length[INSN_UID (prev)] & 2)
|
||
{
|
||
rel_align = LABEL_TO_ALIGNMENT (prev);
|
||
break;
|
||
}
|
||
|
||
/* See the comment on addr_diff_vec_flags in rtl.h for the
|
||
meaning of the flags values. base: REL_LAB vec: INSN */
|
||
/* Anything after INSN has still addresses from the last
|
||
pass; adjust these so that they reflect our current
|
||
estimate for this pass. */
|
||
if (flags.base_after_vec)
|
||
rel_addr += insn_current_address - insn_last_address;
|
||
if (flags.min_after_vec)
|
||
min_addr += insn_current_address - insn_last_address;
|
||
if (flags.max_after_vec)
|
||
max_addr += insn_current_address - insn_last_address;
|
||
/* We want to know the worst case, i.e. lowest possible value
|
||
for the offset of MIN_LAB. If MIN_LAB is after REL_LAB,
|
||
its offset is positive, and we have to be wary of code shrink;
|
||
otherwise, it is negative, and we have to be vary of code
|
||
size increase. */
|
||
if (flags.min_after_base)
|
||
{
|
||
/* If INSN is between REL_LAB and MIN_LAB, the size
|
||
changes we are about to make can change the alignment
|
||
within the observed offset, therefore we have to break
|
||
it up into two parts that are independent. */
|
||
if (! flags.base_after_vec && flags.min_after_vec)
|
||
{
|
||
min_addr -= align_fuzz (rel_lab, insn, rel_align, 0);
|
||
min_addr -= align_fuzz (insn, min_lab, 0, 0);
|
||
}
|
||
else
|
||
min_addr -= align_fuzz (rel_lab, min_lab, rel_align, 0);
|
||
}
|
||
else
|
||
{
|
||
if (flags.base_after_vec && ! flags.min_after_vec)
|
||
{
|
||
min_addr -= align_fuzz (min_lab, insn, 0, ~0);
|
||
min_addr -= align_fuzz (insn, rel_lab, 0, ~0);
|
||
}
|
||
else
|
||
min_addr -= align_fuzz (min_lab, rel_lab, 0, ~0);
|
||
}
|
||
/* Likewise, determine the highest lowest possible value
|
||
for the offset of MAX_LAB. */
|
||
if (flags.max_after_base)
|
||
{
|
||
if (! flags.base_after_vec && flags.max_after_vec)
|
||
{
|
||
max_addr += align_fuzz (rel_lab, insn, rel_align, ~0);
|
||
max_addr += align_fuzz (insn, max_lab, 0, ~0);
|
||
}
|
||
else
|
||
max_addr += align_fuzz (rel_lab, max_lab, rel_align, ~0);
|
||
}
|
||
else
|
||
{
|
||
if (flags.base_after_vec && ! flags.max_after_vec)
|
||
{
|
||
max_addr += align_fuzz (max_lab, insn, 0, 0);
|
||
max_addr += align_fuzz (insn, rel_lab, 0, 0);
|
||
}
|
||
else
|
||
max_addr += align_fuzz (max_lab, rel_lab, 0, 0);
|
||
}
|
||
PUT_MODE (body, CASE_VECTOR_SHORTEN_MODE (min_addr - rel_addr,
|
||
max_addr - rel_addr,
|
||
body));
|
||
if (JUMP_TABLES_IN_TEXT_SECTION
|
||
#if !defined(READONLY_DATA_SECTION)
|
||
|| 1
|
||
#endif
|
||
)
|
||
{
|
||
insn_lengths[uid]
|
||
= (XVECLEN (body, 1) * GET_MODE_SIZE (GET_MODE (body)));
|
||
insn_current_address += insn_lengths[uid];
|
||
if (insn_lengths[uid] != old_length)
|
||
something_changed = 1;
|
||
}
|
||
|
||
continue;
|
||
}
|
||
#endif /* CASE_VECTOR_SHORTEN_MODE */
|
||
|
||
if (! (varying_length[uid]))
|
||
{
|
||
if (GET_CODE (insn) == INSN
|
||
&& GET_CODE (PATTERN (insn)) == SEQUENCE)
|
||
{
|
||
int i;
|
||
|
||
body = PATTERN (insn);
|
||
for (i = 0; i < XVECLEN (body, 0); i++)
|
||
{
|
||
rtx inner_insn = XVECEXP (body, 0, i);
|
||
int inner_uid = INSN_UID (inner_insn);
|
||
|
||
INSN_ADDRESSES (inner_uid) = insn_current_address;
|
||
|
||
insn_current_address += insn_lengths[inner_uid];
|
||
}
|
||
}
|
||
else
|
||
insn_current_address += insn_lengths[uid];
|
||
|
||
continue;
|
||
}
|
||
|
||
if (GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == SEQUENCE)
|
||
{
|
||
int i;
|
||
|
||
body = PATTERN (insn);
|
||
new_length = 0;
|
||
for (i = 0; i < XVECLEN (body, 0); i++)
|
||
{
|
||
rtx inner_insn = XVECEXP (body, 0, i);
|
||
int inner_uid = INSN_UID (inner_insn);
|
||
int inner_length;
|
||
|
||
INSN_ADDRESSES (inner_uid) = insn_current_address;
|
||
|
||
/* insn_current_length returns 0 for insns with a
|
||
non-varying length. */
|
||
if (! varying_length[inner_uid])
|
||
inner_length = insn_lengths[inner_uid];
|
||
else
|
||
inner_length = insn_current_length (inner_insn);
|
||
|
||
if (inner_length != insn_lengths[inner_uid])
|
||
{
|
||
insn_lengths[inner_uid] = inner_length;
|
||
something_changed = 1;
|
||
}
|
||
insn_current_address += insn_lengths[inner_uid];
|
||
new_length += inner_length;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
new_length = insn_current_length (insn);
|
||
insn_current_address += new_length;
|
||
}
|
||
|
||
#ifdef ADJUST_INSN_LENGTH
|
||
/* If needed, do any adjustment. */
|
||
tmp_length = new_length;
|
||
ADJUST_INSN_LENGTH (insn, new_length);
|
||
insn_current_address += (new_length - tmp_length);
|
||
#endif
|
||
|
||
if (new_length != insn_lengths[uid])
|
||
{
|
||
insn_lengths[uid] = new_length;
|
||
something_changed = 1;
|
||
}
|
||
}
|
||
/* For a non-optimizing compile, do only a single pass. */
|
||
if (!optimize)
|
||
break;
|
||
}
|
||
|
||
free (varying_length);
|
||
|
||
#endif /* HAVE_ATTR_length */
|
||
}
|
||
|
||
#ifdef HAVE_ATTR_length
|
||
/* Given the body of an INSN known to be generated by an ASM statement, return
|
||
the number of machine instructions likely to be generated for this insn.
|
||
This is used to compute its length. */
|
||
|
||
static int
|
||
asm_insn_count (body)
|
||
rtx body;
|
||
{
|
||
const char *template;
|
||
int count = 1;
|
||
|
||
if (GET_CODE (body) == ASM_INPUT)
|
||
template = XSTR (body, 0);
|
||
else
|
||
template = decode_asm_operands (body, NULL, NULL, NULL, NULL);
|
||
|
||
for (; *template; template++)
|
||
if (IS_ASM_LOGICAL_LINE_SEPARATOR (*template) || *template == '\n')
|
||
count++;
|
||
|
||
return count;
|
||
}
|
||
#endif
|
||
|
||
/* Output assembler code for the start of a function,
|
||
and initialize some of the variables in this file
|
||
for the new function. The label for the function and associated
|
||
assembler pseudo-ops have already been output in `assemble_start_function'.
|
||
|
||
FIRST is the first insn of the rtl for the function being compiled.
|
||
FILE is the file to write assembler code to.
|
||
OPTIMIZE is nonzero if we should eliminate redundant
|
||
test and compare insns. */
|
||
|
||
void
|
||
final_start_function (first, file, optimize)
|
||
rtx first;
|
||
FILE *file;
|
||
int optimize ATTRIBUTE_UNUSED;
|
||
{
|
||
block_depth = 0;
|
||
|
||
this_is_asm_operands = 0;
|
||
|
||
#ifdef NON_SAVING_SETJMP
|
||
/* A function that calls setjmp should save and restore all the
|
||
call-saved registers on a system where longjmp clobbers them. */
|
||
if (NON_SAVING_SETJMP && current_function_calls_setjmp)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
||
if (!call_used_regs[i])
|
||
regs_ever_live[i] = 1;
|
||
}
|
||
#endif
|
||
|
||
if (NOTE_LINE_NUMBER (first) != NOTE_INSN_DELETED)
|
||
notice_source_line (first);
|
||
high_block_linenum = high_function_linenum = last_linenum;
|
||
|
||
(*debug_hooks->begin_prologue) (last_linenum, last_filename);
|
||
|
||
#if defined (DWARF2_UNWIND_INFO) || defined (IA64_UNWIND_INFO)
|
||
if (write_symbols != DWARF2_DEBUG && write_symbols != VMS_AND_DWARF2_DEBUG)
|
||
dwarf2out_begin_prologue (0, NULL);
|
||
#endif
|
||
|
||
#ifdef LEAF_REG_REMAP
|
||
if (current_function_uses_only_leaf_regs)
|
||
leaf_renumber_regs (first);
|
||
#endif
|
||
|
||
/* The Sun386i and perhaps other machines don't work right
|
||
if the profiling code comes after the prologue. */
|
||
#ifdef PROFILE_BEFORE_PROLOGUE
|
||
if (current_function_profile)
|
||
profile_function (file);
|
||
#endif /* PROFILE_BEFORE_PROLOGUE */
|
||
|
||
#if defined (DWARF2_UNWIND_INFO) && defined (HAVE_prologue)
|
||
if (dwarf2out_do_frame ())
|
||
dwarf2out_frame_debug (NULL_RTX);
|
||
#endif
|
||
|
||
/* If debugging, assign block numbers to all of the blocks in this
|
||
function. */
|
||
if (write_symbols)
|
||
{
|
||
remove_unnecessary_notes ();
|
||
reorder_blocks ();
|
||
number_blocks (current_function_decl);
|
||
/* We never actually put out begin/end notes for the top-level
|
||
block in the function. But, conceptually, that block is
|
||
always needed. */
|
||
TREE_ASM_WRITTEN (DECL_INITIAL (current_function_decl)) = 1;
|
||
}
|
||
|
||
/* First output the function prologue: code to set up the stack frame. */
|
||
(*targetm.asm_out.function_prologue) (file, get_frame_size ());
|
||
|
||
#ifdef VMS_DEBUGGING_INFO
|
||
/* Output label after the prologue of the function. */
|
||
if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
|
||
vmsdbgout_after_prologue ();
|
||
#endif
|
||
|
||
/* If the machine represents the prologue as RTL, the profiling code must
|
||
be emitted when NOTE_INSN_PROLOGUE_END is scanned. */
|
||
#ifdef HAVE_prologue
|
||
if (! HAVE_prologue)
|
||
#endif
|
||
profile_after_prologue (file);
|
||
}
|
||
|
||
static void
|
||
profile_after_prologue (file)
|
||
FILE *file ATTRIBUTE_UNUSED;
|
||
{
|
||
#ifndef PROFILE_BEFORE_PROLOGUE
|
||
if (current_function_profile)
|
||
profile_function (file);
|
||
#endif /* not PROFILE_BEFORE_PROLOGUE */
|
||
}
|
||
|
||
static void
|
||
profile_function (file)
|
||
FILE *file ATTRIBUTE_UNUSED;
|
||
{
|
||
#ifndef NO_PROFILE_COUNTERS
|
||
int align = MIN (BIGGEST_ALIGNMENT, LONG_TYPE_SIZE);
|
||
#endif
|
||
#if defined(ASM_OUTPUT_REG_PUSH)
|
||
#if defined(STRUCT_VALUE_INCOMING_REGNUM) || defined(STRUCT_VALUE_REGNUM)
|
||
int sval = current_function_returns_struct;
|
||
#endif
|
||
#if defined(STATIC_CHAIN_INCOMING_REGNUM) || defined(STATIC_CHAIN_REGNUM)
|
||
int cxt = current_function_needs_context;
|
||
#endif
|
||
#endif /* ASM_OUTPUT_REG_PUSH */
|
||
|
||
#ifndef NO_PROFILE_COUNTERS
|
||
data_section ();
|
||
ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
|
||
ASM_OUTPUT_INTERNAL_LABEL (file, "LP", current_function_profile_label_no);
|
||
assemble_integer (const0_rtx, LONG_TYPE_SIZE / BITS_PER_UNIT, align, 1);
|
||
#endif
|
||
|
||
function_section (current_function_decl);
|
||
|
||
#if defined(STRUCT_VALUE_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
|
||
if (sval)
|
||
ASM_OUTPUT_REG_PUSH (file, STRUCT_VALUE_INCOMING_REGNUM);
|
||
#else
|
||
#if defined(STRUCT_VALUE_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
|
||
if (sval)
|
||
{
|
||
ASM_OUTPUT_REG_PUSH (file, STRUCT_VALUE_REGNUM);
|
||
}
|
||
#endif
|
||
#endif
|
||
|
||
#if defined(STATIC_CHAIN_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
|
||
if (cxt)
|
||
ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_INCOMING_REGNUM);
|
||
#else
|
||
#if defined(STATIC_CHAIN_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
|
||
if (cxt)
|
||
{
|
||
ASM_OUTPUT_REG_PUSH (file, STATIC_CHAIN_REGNUM);
|
||
}
|
||
#endif
|
||
#endif
|
||
|
||
FUNCTION_PROFILER (file, current_function_profile_label_no);
|
||
|
||
#if defined(STATIC_CHAIN_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
|
||
if (cxt)
|
||
ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_INCOMING_REGNUM);
|
||
#else
|
||
#if defined(STATIC_CHAIN_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
|
||
if (cxt)
|
||
{
|
||
ASM_OUTPUT_REG_POP (file, STATIC_CHAIN_REGNUM);
|
||
}
|
||
#endif
|
||
#endif
|
||
|
||
#if defined(STRUCT_VALUE_INCOMING_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
|
||
if (sval)
|
||
ASM_OUTPUT_REG_POP (file, STRUCT_VALUE_INCOMING_REGNUM);
|
||
#else
|
||
#if defined(STRUCT_VALUE_REGNUM) && defined(ASM_OUTPUT_REG_PUSH)
|
||
if (sval)
|
||
{
|
||
ASM_OUTPUT_REG_POP (file, STRUCT_VALUE_REGNUM);
|
||
}
|
||
#endif
|
||
#endif
|
||
}
|
||
|
||
/* Output assembler code for the end of a function.
|
||
For clarity, args are same as those of `final_start_function'
|
||
even though not all of them are needed. */
|
||
|
||
void
|
||
final_end_function ()
|
||
{
|
||
app_disable ();
|
||
|
||
(*debug_hooks->end_function) (high_function_linenum);
|
||
|
||
/* Finally, output the function epilogue:
|
||
code to restore the stack frame and return to the caller. */
|
||
(*targetm.asm_out.function_epilogue) (asm_out_file, get_frame_size ());
|
||
|
||
/* And debug output. */
|
||
(*debug_hooks->end_epilogue) ();
|
||
|
||
#if defined (DWARF2_UNWIND_INFO)
|
||
if (write_symbols != DWARF2_DEBUG && write_symbols != VMS_AND_DWARF2_DEBUG
|
||
&& dwarf2out_do_frame ())
|
||
dwarf2out_end_epilogue ();
|
||
#endif
|
||
}
|
||
|
||
/* Output assembler code for some insns: all or part of a function.
|
||
For description of args, see `final_start_function', above.
|
||
|
||
PRESCAN is 1 if we are not really outputting,
|
||
just scanning as if we were outputting.
|
||
Prescanning deletes and rearranges insns just like ordinary output.
|
||
PRESCAN is -2 if we are outputting after having prescanned.
|
||
In this case, don't try to delete or rearrange insns
|
||
because that has already been done.
|
||
Prescanning is done only on certain machines. */
|
||
|
||
void
|
||
final (first, file, optimize, prescan)
|
||
rtx first;
|
||
FILE *file;
|
||
int optimize;
|
||
int prescan;
|
||
{
|
||
rtx insn;
|
||
int max_line = 0;
|
||
int max_uid = 0;
|
||
|
||
last_ignored_compare = 0;
|
||
new_block = 1;
|
||
|
||
/* Make a map indicating which line numbers appear in this function.
|
||
When producing SDB debugging info, delete troublesome line number
|
||
notes from inlined functions in other files as well as duplicate
|
||
line number notes. */
|
||
#ifdef SDB_DEBUGGING_INFO
|
||
if (write_symbols == SDB_DEBUG)
|
||
{
|
||
rtx last = 0;
|
||
for (insn = first; insn; insn = NEXT_INSN (insn))
|
||
if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
|
||
{
|
||
if ((RTX_INTEGRATED_P (insn)
|
||
&& strcmp (NOTE_SOURCE_FILE (insn), main_input_filename) != 0)
|
||
|| (last != 0
|
||
&& NOTE_LINE_NUMBER (insn) == NOTE_LINE_NUMBER (last)
|
||
&& NOTE_SOURCE_FILE (insn) == NOTE_SOURCE_FILE (last)))
|
||
{
|
||
delete_insn (insn); /* Use delete_note. */
|
||
continue;
|
||
}
|
||
last = insn;
|
||
if (NOTE_LINE_NUMBER (insn) > max_line)
|
||
max_line = NOTE_LINE_NUMBER (insn);
|
||
}
|
||
}
|
||
else
|
||
#endif
|
||
{
|
||
for (insn = first; insn; insn = NEXT_INSN (insn))
|
||
if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > max_line)
|
||
max_line = NOTE_LINE_NUMBER (insn);
|
||
}
|
||
|
||
line_note_exists = (char *) xcalloc (max_line + 1, sizeof (char));
|
||
|
||
for (insn = first; insn; insn = NEXT_INSN (insn))
|
||
{
|
||
if (INSN_UID (insn) > max_uid) /* find largest UID */
|
||
max_uid = INSN_UID (insn);
|
||
if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
|
||
line_note_exists[NOTE_LINE_NUMBER (insn)] = 1;
|
||
#ifdef HAVE_cc0
|
||
/* If CC tracking across branches is enabled, record the insn which
|
||
jumps to each branch only reached from one place. */
|
||
if (optimize && GET_CODE (insn) == JUMP_INSN)
|
||
{
|
||
rtx lab = JUMP_LABEL (insn);
|
||
if (lab && LABEL_NUSES (lab) == 1)
|
||
{
|
||
LABEL_REFS (lab) = insn;
|
||
}
|
||
}
|
||
#endif
|
||
}
|
||
|
||
init_recog ();
|
||
|
||
CC_STATUS_INIT;
|
||
|
||
/* Output the insns. */
|
||
for (insn = NEXT_INSN (first); insn;)
|
||
{
|
||
#ifdef HAVE_ATTR_length
|
||
if ((unsigned) INSN_UID (insn) >= INSN_ADDRESSES_SIZE ())
|
||
{
|
||
#ifdef STACK_REGS
|
||
/* Irritatingly, the reg-stack pass is creating new instructions
|
||
and because of REG_DEAD note abuse it has to run after
|
||
shorten_branches. Fake address of -1 then. */
|
||
insn_current_address = -1;
|
||
#else
|
||
/* This can be triggered by bugs elsewhere in the compiler if
|
||
new insns are created after init_insn_lengths is called. */
|
||
abort ();
|
||
#endif
|
||
}
|
||
else
|
||
insn_current_address = INSN_ADDRESSES (INSN_UID (insn));
|
||
#endif /* HAVE_ATTR_length */
|
||
|
||
insn = final_scan_insn (insn, file, optimize, prescan, 0);
|
||
}
|
||
|
||
free (line_note_exists);
|
||
line_note_exists = NULL;
|
||
}
|
||
|
||
const char *
|
||
get_insn_template (code, insn)
|
||
int code;
|
||
rtx insn;
|
||
{
|
||
const void *output = insn_data[code].output;
|
||
switch (insn_data[code].output_format)
|
||
{
|
||
case INSN_OUTPUT_FORMAT_SINGLE:
|
||
return (const char *) output;
|
||
case INSN_OUTPUT_FORMAT_MULTI:
|
||
return ((const char *const *) output)[which_alternative];
|
||
case INSN_OUTPUT_FORMAT_FUNCTION:
|
||
if (insn == NULL)
|
||
abort ();
|
||
return (*(insn_output_fn) output) (recog_data.operand, insn);
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
|
||
/* The final scan for one insn, INSN.
|
||
Args are same as in `final', except that INSN
|
||
is the insn being scanned.
|
||
Value returned is the next insn to be scanned.
|
||
|
||
NOPEEPHOLES is the flag to disallow peephole processing (currently
|
||
used for within delayed branch sequence output). */
|
||
|
||
rtx
|
||
final_scan_insn (insn, file, optimize, prescan, nopeepholes)
|
||
rtx insn;
|
||
FILE *file;
|
||
int optimize ATTRIBUTE_UNUSED;
|
||
int prescan;
|
||
int nopeepholes ATTRIBUTE_UNUSED;
|
||
{
|
||
#ifdef HAVE_cc0
|
||
rtx set;
|
||
#endif
|
||
|
||
insn_counter++;
|
||
|
||
/* Ignore deleted insns. These can occur when we split insns (due to a
|
||
template of "#") while not optimizing. */
|
||
if (INSN_DELETED_P (insn))
|
||
return NEXT_INSN (insn);
|
||
|
||
switch (GET_CODE (insn))
|
||
{
|
||
case NOTE:
|
||
if (prescan > 0)
|
||
break;
|
||
|
||
switch (NOTE_LINE_NUMBER (insn))
|
||
{
|
||
case NOTE_INSN_DELETED:
|
||
case NOTE_INSN_LOOP_BEG:
|
||
case NOTE_INSN_LOOP_END:
|
||
case NOTE_INSN_LOOP_END_TOP_COND:
|
||
case NOTE_INSN_LOOP_CONT:
|
||
case NOTE_INSN_LOOP_VTOP:
|
||
case NOTE_INSN_FUNCTION_END:
|
||
case NOTE_INSN_REPEATED_LINE_NUMBER:
|
||
case NOTE_INSN_RANGE_BEG:
|
||
case NOTE_INSN_RANGE_END:
|
||
case NOTE_INSN_LIVE:
|
||
case NOTE_INSN_EXPECTED_VALUE:
|
||
break;
|
||
|
||
case NOTE_INSN_BASIC_BLOCK:
|
||
#ifdef IA64_UNWIND_INFO
|
||
IA64_UNWIND_EMIT (asm_out_file, insn);
|
||
#endif
|
||
if (flag_debug_asm)
|
||
fprintf (asm_out_file, "\t%s basic block %d\n",
|
||
ASM_COMMENT_START, NOTE_BASIC_BLOCK (insn)->index);
|
||
break;
|
||
|
||
case NOTE_INSN_EH_REGION_BEG:
|
||
ASM_OUTPUT_DEBUG_LABEL (asm_out_file, "LEHB",
|
||
NOTE_EH_HANDLER (insn));
|
||
break;
|
||
|
||
case NOTE_INSN_EH_REGION_END:
|
||
ASM_OUTPUT_DEBUG_LABEL (asm_out_file, "LEHE",
|
||
NOTE_EH_HANDLER (insn));
|
||
break;
|
||
|
||
case NOTE_INSN_PROLOGUE_END:
|
||
(*targetm.asm_out.function_end_prologue) (file);
|
||
profile_after_prologue (file);
|
||
break;
|
||
|
||
case NOTE_INSN_EPILOGUE_BEG:
|
||
(*targetm.asm_out.function_begin_epilogue) (file);
|
||
break;
|
||
|
||
case NOTE_INSN_FUNCTION_BEG:
|
||
app_disable ();
|
||
(*debug_hooks->end_prologue) (last_linenum);
|
||
break;
|
||
|
||
case NOTE_INSN_BLOCK_BEG:
|
||
if (debug_info_level == DINFO_LEVEL_NORMAL
|
||
|| debug_info_level == DINFO_LEVEL_VERBOSE
|
||
|| write_symbols == DWARF_DEBUG
|
||
|| write_symbols == DWARF2_DEBUG
|
||
|| write_symbols == VMS_AND_DWARF2_DEBUG
|
||
|| write_symbols == VMS_DEBUG)
|
||
{
|
||
int n = BLOCK_NUMBER (NOTE_BLOCK (insn));
|
||
|
||
app_disable ();
|
||
++block_depth;
|
||
high_block_linenum = last_linenum;
|
||
|
||
/* Output debugging info about the symbol-block beginning. */
|
||
(*debug_hooks->begin_block) (last_linenum, n);
|
||
|
||
/* Mark this block as output. */
|
||
TREE_ASM_WRITTEN (NOTE_BLOCK (insn)) = 1;
|
||
}
|
||
break;
|
||
|
||
case NOTE_INSN_BLOCK_END:
|
||
if (debug_info_level == DINFO_LEVEL_NORMAL
|
||
|| debug_info_level == DINFO_LEVEL_VERBOSE
|
||
|| write_symbols == DWARF_DEBUG
|
||
|| write_symbols == DWARF2_DEBUG
|
||
|| write_symbols == VMS_AND_DWARF2_DEBUG
|
||
|| write_symbols == VMS_DEBUG)
|
||
{
|
||
int n = BLOCK_NUMBER (NOTE_BLOCK (insn));
|
||
|
||
app_disable ();
|
||
|
||
/* End of a symbol-block. */
|
||
--block_depth;
|
||
if (block_depth < 0)
|
||
abort ();
|
||
|
||
(*debug_hooks->end_block) (high_block_linenum, n);
|
||
}
|
||
break;
|
||
|
||
case NOTE_INSN_DELETED_LABEL:
|
||
/* Emit the label. We may have deleted the CODE_LABEL because
|
||
the label could be proved to be unreachable, though still
|
||
referenced (in the form of having its address taken. */
|
||
ASM_OUTPUT_DEBUG_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
|
||
break;
|
||
|
||
case 0:
|
||
break;
|
||
|
||
default:
|
||
if (NOTE_LINE_NUMBER (insn) <= 0)
|
||
abort ();
|
||
|
||
/* This note is a line-number. */
|
||
{
|
||
rtx note;
|
||
int note_after = 0;
|
||
|
||
/* If there is anything real after this note, output it.
|
||
If another line note follows, omit this one. */
|
||
for (note = NEXT_INSN (insn); note; note = NEXT_INSN (note))
|
||
{
|
||
if (GET_CODE (note) != NOTE && GET_CODE (note) != CODE_LABEL)
|
||
break;
|
||
|
||
/* These types of notes can be significant
|
||
so make sure the preceding line number stays. */
|
||
else if (GET_CODE (note) == NOTE
|
||
&& (NOTE_LINE_NUMBER (note) == NOTE_INSN_BLOCK_BEG
|
||
|| NOTE_LINE_NUMBER (note) == NOTE_INSN_BLOCK_END
|
||
|| NOTE_LINE_NUMBER (note) == NOTE_INSN_FUNCTION_BEG))
|
||
break;
|
||
else if (GET_CODE (note) == NOTE && NOTE_LINE_NUMBER (note) > 0)
|
||
{
|
||
/* Another line note follows; we can delete this note
|
||
if no intervening line numbers have notes elsewhere. */
|
||
int num;
|
||
for (num = NOTE_LINE_NUMBER (insn) + 1;
|
||
num < NOTE_LINE_NUMBER (note);
|
||
num++)
|
||
if (line_note_exists[num])
|
||
break;
|
||
|
||
if (num >= NOTE_LINE_NUMBER (note))
|
||
note_after = 1;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Output this line note if it is the first or the last line
|
||
note in a row. */
|
||
if (!note_after)
|
||
{
|
||
notice_source_line (insn);
|
||
(*debug_hooks->source_line) (last_linenum, last_filename);
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
break;
|
||
|
||
case BARRIER:
|
||
#if defined (DWARF2_UNWIND_INFO)
|
||
if (dwarf2out_do_frame ())
|
||
dwarf2out_frame_debug (insn);
|
||
#endif
|
||
break;
|
||
|
||
case CODE_LABEL:
|
||
/* The target port might emit labels in the output function for
|
||
some insn, e.g. sh.c output_branchy_insn. */
|
||
if (CODE_LABEL_NUMBER (insn) <= max_labelno)
|
||
{
|
||
int align = LABEL_TO_ALIGNMENT (insn);
|
||
#ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
|
||
int max_skip = LABEL_TO_MAX_SKIP (insn);
|
||
#endif
|
||
|
||
if (align && NEXT_INSN (insn))
|
||
{
|
||
#ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
|
||
ASM_OUTPUT_MAX_SKIP_ALIGN (file, align, max_skip);
|
||
#else
|
||
ASM_OUTPUT_ALIGN (file, align);
|
||
#endif
|
||
}
|
||
}
|
||
#ifdef HAVE_cc0
|
||
CC_STATUS_INIT;
|
||
/* If this label is reached from only one place, set the condition
|
||
codes from the instruction just before the branch. */
|
||
|
||
/* Disabled because some insns set cc_status in the C output code
|
||
and NOTICE_UPDATE_CC alone can set incorrect status. */
|
||
if (0 /* optimize && LABEL_NUSES (insn) == 1*/)
|
||
{
|
||
rtx jump = LABEL_REFS (insn);
|
||
rtx barrier = prev_nonnote_insn (insn);
|
||
rtx prev;
|
||
/* If the LABEL_REFS field of this label has been set to point
|
||
at a branch, the predecessor of the branch is a regular
|
||
insn, and that branch is the only way to reach this label,
|
||
set the condition codes based on the branch and its
|
||
predecessor. */
|
||
if (barrier && GET_CODE (barrier) == BARRIER
|
||
&& jump && GET_CODE (jump) == JUMP_INSN
|
||
&& (prev = prev_nonnote_insn (jump))
|
||
&& GET_CODE (prev) == INSN)
|
||
{
|
||
NOTICE_UPDATE_CC (PATTERN (prev), prev);
|
||
NOTICE_UPDATE_CC (PATTERN (jump), jump);
|
||
}
|
||
}
|
||
#endif
|
||
if (prescan > 0)
|
||
break;
|
||
new_block = 1;
|
||
|
||
#ifdef FINAL_PRESCAN_LABEL
|
||
FINAL_PRESCAN_INSN (insn, NULL, 0);
|
||
#endif
|
||
|
||
if (LABEL_NAME (insn))
|
||
(*debug_hooks->label) (insn);
|
||
|
||
if (app_on)
|
||
{
|
||
fputs (ASM_APP_OFF, file);
|
||
app_on = 0;
|
||
}
|
||
if (NEXT_INSN (insn) != 0
|
||
&& GET_CODE (NEXT_INSN (insn)) == JUMP_INSN)
|
||
{
|
||
rtx nextbody = PATTERN (NEXT_INSN (insn));
|
||
|
||
/* If this label is followed by a jump-table,
|
||
make sure we put the label in the read-only section. Also
|
||
possibly write the label and jump table together. */
|
||
|
||
if (GET_CODE (nextbody) == ADDR_VEC
|
||
|| GET_CODE (nextbody) == ADDR_DIFF_VEC)
|
||
{
|
||
#if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
|
||
/* In this case, the case vector is being moved by the
|
||
target, so don't output the label at all. Leave that
|
||
to the back end macros. */
|
||
#else
|
||
if (! JUMP_TABLES_IN_TEXT_SECTION)
|
||
{
|
||
int log_align;
|
||
|
||
readonly_data_section ();
|
||
|
||
#ifdef ADDR_VEC_ALIGN
|
||
log_align = ADDR_VEC_ALIGN (NEXT_INSN (insn));
|
||
#else
|
||
log_align = exact_log2 (BIGGEST_ALIGNMENT / BITS_PER_UNIT);
|
||
#endif
|
||
ASM_OUTPUT_ALIGN (file, log_align);
|
||
}
|
||
else
|
||
function_section (current_function_decl);
|
||
|
||
#ifdef ASM_OUTPUT_CASE_LABEL
|
||
ASM_OUTPUT_CASE_LABEL (file, "L", CODE_LABEL_NUMBER (insn),
|
||
NEXT_INSN (insn));
|
||
#else
|
||
if (LABEL_ALTERNATE_NAME (insn))
|
||
ASM_OUTPUT_ALTERNATE_LABEL_NAME (file, insn);
|
||
else
|
||
ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
|
||
#endif
|
||
#endif
|
||
break;
|
||
}
|
||
}
|
||
if (LABEL_ALTERNATE_NAME (insn))
|
||
ASM_OUTPUT_ALTERNATE_LABEL_NAME (file, insn);
|
||
else
|
||
ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
|
||
break;
|
||
|
||
default:
|
||
{
|
||
rtx body = PATTERN (insn);
|
||
int insn_code_number;
|
||
const char *template;
|
||
rtx note;
|
||
|
||
/* An INSN, JUMP_INSN or CALL_INSN.
|
||
First check for special kinds that recog doesn't recognize. */
|
||
|
||
if (GET_CODE (body) == USE /* These are just declarations */
|
||
|| GET_CODE (body) == CLOBBER)
|
||
break;
|
||
|
||
#ifdef HAVE_cc0
|
||
/* If there is a REG_CC_SETTER note on this insn, it means that
|
||
the setting of the condition code was done in the delay slot
|
||
of the insn that branched here. So recover the cc status
|
||
from the insn that set it. */
|
||
|
||
note = find_reg_note (insn, REG_CC_SETTER, NULL_RTX);
|
||
if (note)
|
||
{
|
||
NOTICE_UPDATE_CC (PATTERN (XEXP (note, 0)), XEXP (note, 0));
|
||
cc_prev_status = cc_status;
|
||
}
|
||
#endif
|
||
|
||
/* Detect insns that are really jump-tables
|
||
and output them as such. */
|
||
|
||
if (GET_CODE (body) == ADDR_VEC || GET_CODE (body) == ADDR_DIFF_VEC)
|
||
{
|
||
#if !(defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC))
|
||
int vlen, idx;
|
||
#endif
|
||
|
||
if (prescan > 0)
|
||
break;
|
||
|
||
if (app_on)
|
||
{
|
||
fputs (ASM_APP_OFF, file);
|
||
app_on = 0;
|
||
}
|
||
|
||
#if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
|
||
if (GET_CODE (body) == ADDR_VEC)
|
||
{
|
||
#ifdef ASM_OUTPUT_ADDR_VEC
|
||
ASM_OUTPUT_ADDR_VEC (PREV_INSN (insn), body);
|
||
#else
|
||
abort ();
|
||
#endif
|
||
}
|
||
else
|
||
{
|
||
#ifdef ASM_OUTPUT_ADDR_DIFF_VEC
|
||
ASM_OUTPUT_ADDR_DIFF_VEC (PREV_INSN (insn), body);
|
||
#else
|
||
abort ();
|
||
#endif
|
||
}
|
||
#else
|
||
vlen = XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC);
|
||
for (idx = 0; idx < vlen; idx++)
|
||
{
|
||
if (GET_CODE (body) == ADDR_VEC)
|
||
{
|
||
#ifdef ASM_OUTPUT_ADDR_VEC_ELT
|
||
ASM_OUTPUT_ADDR_VEC_ELT
|
||
(file, CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 0, idx), 0)));
|
||
#else
|
||
abort ();
|
||
#endif
|
||
}
|
||
else
|
||
{
|
||
#ifdef ASM_OUTPUT_ADDR_DIFF_ELT
|
||
ASM_OUTPUT_ADDR_DIFF_ELT
|
||
(file,
|
||
body,
|
||
CODE_LABEL_NUMBER (XEXP (XVECEXP (body, 1, idx), 0)),
|
||
CODE_LABEL_NUMBER (XEXP (XEXP (body, 0), 0)));
|
||
#else
|
||
abort ();
|
||
#endif
|
||
}
|
||
}
|
||
#ifdef ASM_OUTPUT_CASE_END
|
||
ASM_OUTPUT_CASE_END (file,
|
||
CODE_LABEL_NUMBER (PREV_INSN (insn)),
|
||
insn);
|
||
#endif
|
||
#endif
|
||
|
||
function_section (current_function_decl);
|
||
|
||
break;
|
||
}
|
||
|
||
if (GET_CODE (body) == ASM_INPUT)
|
||
{
|
||
const char *string = XSTR (body, 0);
|
||
|
||
/* There's no telling what that did to the condition codes. */
|
||
CC_STATUS_INIT;
|
||
if (prescan > 0)
|
||
break;
|
||
|
||
if (string[0])
|
||
{
|
||
if (! app_on)
|
||
{
|
||
fputs (ASM_APP_ON, file);
|
||
app_on = 1;
|
||
}
|
||
fprintf (asm_out_file, "\t%s\n", string);
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* Detect `asm' construct with operands. */
|
||
if (asm_noperands (body) >= 0)
|
||
{
|
||
unsigned int noperands = asm_noperands (body);
|
||
rtx *ops = (rtx *) alloca (noperands * sizeof (rtx));
|
||
const char *string;
|
||
|
||
/* There's no telling what that did to the condition codes. */
|
||
CC_STATUS_INIT;
|
||
if (prescan > 0)
|
||
break;
|
||
|
||
/* Get out the operand values. */
|
||
string = decode_asm_operands (body, ops, NULL, NULL, NULL);
|
||
/* Inhibit aborts on what would otherwise be compiler bugs. */
|
||
insn_noperands = noperands;
|
||
this_is_asm_operands = insn;
|
||
|
||
/* Output the insn using them. */
|
||
if (string[0])
|
||
{
|
||
if (! app_on)
|
||
{
|
||
fputs (ASM_APP_ON, file);
|
||
app_on = 1;
|
||
}
|
||
output_asm_insn (string, ops);
|
||
}
|
||
|
||
this_is_asm_operands = 0;
|
||
break;
|
||
}
|
||
|
||
if (prescan <= 0 && app_on)
|
||
{
|
||
fputs (ASM_APP_OFF, file);
|
||
app_on = 0;
|
||
}
|
||
|
||
if (GET_CODE (body) == SEQUENCE)
|
||
{
|
||
/* A delayed-branch sequence */
|
||
int i;
|
||
rtx next;
|
||
|
||
if (prescan > 0)
|
||
break;
|
||
final_sequence = body;
|
||
|
||
/* The first insn in this SEQUENCE might be a JUMP_INSN that will
|
||
force the restoration of a comparison that was previously
|
||
thought unnecessary. If that happens, cancel this sequence
|
||
and cause that insn to be restored. */
|
||
|
||
next = final_scan_insn (XVECEXP (body, 0, 0), file, 0, prescan, 1);
|
||
if (next != XVECEXP (body, 0, 1))
|
||
{
|
||
final_sequence = 0;
|
||
return next;
|
||
}
|
||
|
||
for (i = 1; i < XVECLEN (body, 0); i++)
|
||
{
|
||
rtx insn = XVECEXP (body, 0, i);
|
||
rtx next = NEXT_INSN (insn);
|
||
/* We loop in case any instruction in a delay slot gets
|
||
split. */
|
||
do
|
||
insn = final_scan_insn (insn, file, 0, prescan, 1);
|
||
while (insn != next);
|
||
}
|
||
#ifdef DBR_OUTPUT_SEQEND
|
||
DBR_OUTPUT_SEQEND (file);
|
||
#endif
|
||
final_sequence = 0;
|
||
|
||
/* If the insn requiring the delay slot was a CALL_INSN, the
|
||
insns in the delay slot are actually executed before the
|
||
called function. Hence we don't preserve any CC-setting
|
||
actions in these insns and the CC must be marked as being
|
||
clobbered by the function. */
|
||
if (GET_CODE (XVECEXP (body, 0, 0)) == CALL_INSN)
|
||
{
|
||
CC_STATUS_INIT;
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* We have a real machine instruction as rtl. */
|
||
|
||
body = PATTERN (insn);
|
||
|
||
#ifdef HAVE_cc0
|
||
set = single_set (insn);
|
||
|
||
/* Check for redundant test and compare instructions
|
||
(when the condition codes are already set up as desired).
|
||
This is done only when optimizing; if not optimizing,
|
||
it should be possible for the user to alter a variable
|
||
with the debugger in between statements
|
||
and the next statement should reexamine the variable
|
||
to compute the condition codes. */
|
||
|
||
if (optimize)
|
||
{
|
||
#if 0
|
||
rtx set = single_set (insn);
|
||
#endif
|
||
|
||
if (set
|
||
&& GET_CODE (SET_DEST (set)) == CC0
|
||
&& insn != last_ignored_compare)
|
||
{
|
||
if (GET_CODE (SET_SRC (set)) == SUBREG)
|
||
SET_SRC (set) = alter_subreg (&SET_SRC (set));
|
||
else if (GET_CODE (SET_SRC (set)) == COMPARE)
|
||
{
|
||
if (GET_CODE (XEXP (SET_SRC (set), 0)) == SUBREG)
|
||
XEXP (SET_SRC (set), 0)
|
||
= alter_subreg (&XEXP (SET_SRC (set), 0));
|
||
if (GET_CODE (XEXP (SET_SRC (set), 1)) == SUBREG)
|
||
XEXP (SET_SRC (set), 1)
|
||
= alter_subreg (&XEXP (SET_SRC (set), 1));
|
||
}
|
||
if ((cc_status.value1 != 0
|
||
&& rtx_equal_p (SET_SRC (set), cc_status.value1))
|
||
|| (cc_status.value2 != 0
|
||
&& rtx_equal_p (SET_SRC (set), cc_status.value2)))
|
||
{
|
||
/* Don't delete insn if it has an addressing side-effect. */
|
||
if (! FIND_REG_INC_NOTE (insn, NULL_RTX)
|
||
/* or if anything in it is volatile. */
|
||
&& ! volatile_refs_p (PATTERN (insn)))
|
||
{
|
||
/* We don't really delete the insn; just ignore it. */
|
||
last_ignored_compare = insn;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
#endif
|
||
|
||
#ifndef STACK_REGS
|
||
/* Don't bother outputting obvious no-ops, even without -O.
|
||
This optimization is fast and doesn't interfere with debugging.
|
||
Don't do this if the insn is in a delay slot, since this
|
||
will cause an improper number of delay insns to be written. */
|
||
if (final_sequence == 0
|
||
&& prescan >= 0
|
||
&& GET_CODE (insn) == INSN && GET_CODE (body) == SET
|
||
&& GET_CODE (SET_SRC (body)) == REG
|
||
&& GET_CODE (SET_DEST (body)) == REG
|
||
&& REGNO (SET_SRC (body)) == REGNO (SET_DEST (body)))
|
||
break;
|
||
#endif
|
||
|
||
#ifdef HAVE_cc0
|
||
/* If this is a conditional branch, maybe modify it
|
||
if the cc's are in a nonstandard state
|
||
so that it accomplishes the same thing that it would
|
||
do straightforwardly if the cc's were set up normally. */
|
||
|
||
if (cc_status.flags != 0
|
||
&& GET_CODE (insn) == JUMP_INSN
|
||
&& GET_CODE (body) == SET
|
||
&& SET_DEST (body) == pc_rtx
|
||
&& GET_CODE (SET_SRC (body)) == IF_THEN_ELSE
|
||
&& GET_RTX_CLASS (GET_CODE (XEXP (SET_SRC (body), 0))) == '<'
|
||
&& XEXP (XEXP (SET_SRC (body), 0), 0) == cc0_rtx
|
||
/* This is done during prescan; it is not done again
|
||
in final scan when prescan has been done. */
|
||
&& prescan >= 0)
|
||
{
|
||
/* This function may alter the contents of its argument
|
||
and clear some of the cc_status.flags bits.
|
||
It may also return 1 meaning condition now always true
|
||
or -1 meaning condition now always false
|
||
or 2 meaning condition nontrivial but altered. */
|
||
int result = alter_cond (XEXP (SET_SRC (body), 0));
|
||
/* If condition now has fixed value, replace the IF_THEN_ELSE
|
||
with its then-operand or its else-operand. */
|
||
if (result == 1)
|
||
SET_SRC (body) = XEXP (SET_SRC (body), 1);
|
||
if (result == -1)
|
||
SET_SRC (body) = XEXP (SET_SRC (body), 2);
|
||
|
||
/* The jump is now either unconditional or a no-op.
|
||
If it has become a no-op, don't try to output it.
|
||
(It would not be recognized.) */
|
||
if (SET_SRC (body) == pc_rtx)
|
||
{
|
||
delete_insn (insn);
|
||
break;
|
||
}
|
||
else if (GET_CODE (SET_SRC (body)) == RETURN)
|
||
/* Replace (set (pc) (return)) with (return). */
|
||
PATTERN (insn) = body = SET_SRC (body);
|
||
|
||
/* Rerecognize the instruction if it has changed. */
|
||
if (result != 0)
|
||
INSN_CODE (insn) = -1;
|
||
}
|
||
|
||
/* Make same adjustments to instructions that examine the
|
||
condition codes without jumping and instructions that
|
||
handle conditional moves (if this machine has either one). */
|
||
|
||
if (cc_status.flags != 0
|
||
&& set != 0)
|
||
{
|
||
rtx cond_rtx, then_rtx, else_rtx;
|
||
|
||
if (GET_CODE (insn) != JUMP_INSN
|
||
&& GET_CODE (SET_SRC (set)) == IF_THEN_ELSE)
|
||
{
|
||
cond_rtx = XEXP (SET_SRC (set), 0);
|
||
then_rtx = XEXP (SET_SRC (set), 1);
|
||
else_rtx = XEXP (SET_SRC (set), 2);
|
||
}
|
||
else
|
||
{
|
||
cond_rtx = SET_SRC (set);
|
||
then_rtx = const_true_rtx;
|
||
else_rtx = const0_rtx;
|
||
}
|
||
|
||
switch (GET_CODE (cond_rtx))
|
||
{
|
||
case GTU:
|
||
case GT:
|
||
case LTU:
|
||
case LT:
|
||
case GEU:
|
||
case GE:
|
||
case LEU:
|
||
case LE:
|
||
case EQ:
|
||
case NE:
|
||
{
|
||
int result;
|
||
if (XEXP (cond_rtx, 0) != cc0_rtx)
|
||
break;
|
||
result = alter_cond (cond_rtx);
|
||
if (result == 1)
|
||
validate_change (insn, &SET_SRC (set), then_rtx, 0);
|
||
else if (result == -1)
|
||
validate_change (insn, &SET_SRC (set), else_rtx, 0);
|
||
else if (result == 2)
|
||
INSN_CODE (insn) = -1;
|
||
if (SET_DEST (set) == SET_SRC (set))
|
||
delete_insn (insn);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
#endif
|
||
|
||
#ifdef HAVE_peephole
|
||
/* Do machine-specific peephole optimizations if desired. */
|
||
|
||
if (optimize && !flag_no_peephole && !nopeepholes)
|
||
{
|
||
rtx next = peephole (insn);
|
||
/* When peepholing, if there were notes within the peephole,
|
||
emit them before the peephole. */
|
||
if (next != 0 && next != NEXT_INSN (insn))
|
||
{
|
||
rtx prev = PREV_INSN (insn);
|
||
|
||
for (note = NEXT_INSN (insn); note != next;
|
||
note = NEXT_INSN (note))
|
||
final_scan_insn (note, file, optimize, prescan, nopeepholes);
|
||
|
||
/* In case this is prescan, put the notes
|
||
in proper position for later rescan. */
|
||
note = NEXT_INSN (insn);
|
||
PREV_INSN (note) = prev;
|
||
NEXT_INSN (prev) = note;
|
||
NEXT_INSN (PREV_INSN (next)) = insn;
|
||
PREV_INSN (insn) = PREV_INSN (next);
|
||
NEXT_INSN (insn) = next;
|
||
PREV_INSN (next) = insn;
|
||
}
|
||
|
||
/* PEEPHOLE might have changed this. */
|
||
body = PATTERN (insn);
|
||
}
|
||
#endif
|
||
|
||
/* Try to recognize the instruction.
|
||
If successful, verify that the operands satisfy the
|
||
constraints for the instruction. Crash if they don't,
|
||
since `reload' should have changed them so that they do. */
|
||
|
||
insn_code_number = recog_memoized (insn);
|
||
cleanup_subreg_operands (insn);
|
||
|
||
/* Dump the insn in the assembly for debugging. */
|
||
if (flag_dump_rtl_in_asm)
|
||
{
|
||
print_rtx_head = ASM_COMMENT_START;
|
||
print_rtl_single (asm_out_file, insn);
|
||
print_rtx_head = "";
|
||
}
|
||
|
||
if (! constrain_operands_cached (1))
|
||
fatal_insn_not_found (insn);
|
||
|
||
/* Some target machines need to prescan each insn before
|
||
it is output. */
|
||
|
||
#ifdef FINAL_PRESCAN_INSN
|
||
FINAL_PRESCAN_INSN (insn, recog_data.operand, recog_data.n_operands);
|
||
#endif
|
||
|
||
#ifdef HAVE_conditional_execution
|
||
if (GET_CODE (PATTERN (insn)) == COND_EXEC)
|
||
current_insn_predicate = COND_EXEC_TEST (PATTERN (insn));
|
||
else
|
||
current_insn_predicate = NULL_RTX;
|
||
#endif
|
||
|
||
#ifdef HAVE_cc0
|
||
cc_prev_status = cc_status;
|
||
|
||
/* Update `cc_status' for this instruction.
|
||
The instruction's output routine may change it further.
|
||
If the output routine for a jump insn needs to depend
|
||
on the cc status, it should look at cc_prev_status. */
|
||
|
||
NOTICE_UPDATE_CC (body, insn);
|
||
#endif
|
||
|
||
current_output_insn = debug_insn = insn;
|
||
|
||
#if defined (DWARF2_UNWIND_INFO)
|
||
if (GET_CODE (insn) == CALL_INSN && dwarf2out_do_frame ())
|
||
dwarf2out_frame_debug (insn);
|
||
#endif
|
||
|
||
/* Find the proper template for this insn. */
|
||
template = get_insn_template (insn_code_number, insn);
|
||
|
||
/* If the C code returns 0, it means that it is a jump insn
|
||
which follows a deleted test insn, and that test insn
|
||
needs to be reinserted. */
|
||
if (template == 0)
|
||
{
|
||
rtx prev;
|
||
|
||
if (prev_nonnote_insn (insn) != last_ignored_compare)
|
||
abort ();
|
||
new_block = 0;
|
||
|
||
/* We have already processed the notes between the setter and
|
||
the user. Make sure we don't process them again, this is
|
||
particularly important if one of the notes is a block
|
||
scope note or an EH note. */
|
||
for (prev = insn;
|
||
prev != last_ignored_compare;
|
||
prev = PREV_INSN (prev))
|
||
{
|
||
if (GET_CODE (prev) == NOTE)
|
||
delete_insn (prev); /* Use delete_note. */
|
||
}
|
||
|
||
return prev;
|
||
}
|
||
|
||
/* If the template is the string "#", it means that this insn must
|
||
be split. */
|
||
if (template[0] == '#' && template[1] == '\0')
|
||
{
|
||
rtx new = try_split (body, insn, 0);
|
||
|
||
/* If we didn't split the insn, go away. */
|
||
if (new == insn && PATTERN (new) == body)
|
||
fatal_insn ("could not split insn", insn);
|
||
|
||
#ifdef HAVE_ATTR_length
|
||
/* This instruction should have been split in shorten_branches,
|
||
to ensure that we would have valid length info for the
|
||
splitees. */
|
||
abort ();
|
||
#endif
|
||
|
||
new_block = 0;
|
||
return new;
|
||
}
|
||
|
||
if (prescan > 0)
|
||
break;
|
||
|
||
#ifdef IA64_UNWIND_INFO
|
||
IA64_UNWIND_EMIT (asm_out_file, insn);
|
||
#endif
|
||
/* Output assembler code from the template. */
|
||
|
||
output_asm_insn (template, recog_data.operand);
|
||
|
||
#if defined (DWARF2_UNWIND_INFO)
|
||
#if defined (HAVE_prologue)
|
||
if (GET_CODE (insn) == INSN && dwarf2out_do_frame ())
|
||
dwarf2out_frame_debug (insn);
|
||
#else
|
||
if (!ACCUMULATE_OUTGOING_ARGS
|
||
&& GET_CODE (insn) == INSN
|
||
&& dwarf2out_do_frame ())
|
||
dwarf2out_frame_debug (insn);
|
||
#endif
|
||
#endif
|
||
|
||
#if 0
|
||
/* It's not at all clear why we did this and doing so interferes
|
||
with tests we'd like to do to use REG_WAS_0 notes, so let's try
|
||
with this out. */
|
||
|
||
/* Mark this insn as having been output. */
|
||
INSN_DELETED_P (insn) = 1;
|
||
#endif
|
||
|
||
/* Emit information for vtable gc. */
|
||
note = find_reg_note (insn, REG_VTABLE_REF, NULL_RTX);
|
||
if (note)
|
||
assemble_vtable_entry (XEXP (XEXP (note, 0), 0),
|
||
INTVAL (XEXP (XEXP (note, 0), 1)));
|
||
|
||
current_output_insn = debug_insn = 0;
|
||
}
|
||
}
|
||
return NEXT_INSN (insn);
|
||
}
|
||
|
||
/* Output debugging info to the assembler file FILE
|
||
based on the NOTE-insn INSN, assumed to be a line number. */
|
||
|
||
static void
|
||
notice_source_line (insn)
|
||
rtx insn;
|
||
{
|
||
const char *filename = NOTE_SOURCE_FILE (insn);
|
||
|
||
last_filename = filename;
|
||
last_linenum = NOTE_LINE_NUMBER (insn);
|
||
high_block_linenum = MAX (last_linenum, high_block_linenum);
|
||
high_function_linenum = MAX (last_linenum, high_function_linenum);
|
||
}
|
||
|
||
/* For each operand in INSN, simplify (subreg (reg)) so that it refers
|
||
directly to the desired hard register. */
|
||
|
||
void
|
||
cleanup_subreg_operands (insn)
|
||
rtx insn;
|
||
{
|
||
int i;
|
||
extract_insn_cached (insn);
|
||
for (i = 0; i < recog_data.n_operands; i++)
|
||
{
|
||
/* The following test cannot use recog_data.operand when tesing
|
||
for a SUBREG: the underlying object might have been changed
|
||
already if we are inside a match_operator expression that
|
||
matches the else clause. Instead we test the underlying
|
||
expression directly. */
|
||
if (GET_CODE (*recog_data.operand_loc[i]) == SUBREG)
|
||
recog_data.operand[i] = alter_subreg (recog_data.operand_loc[i]);
|
||
else if (GET_CODE (recog_data.operand[i]) == PLUS
|
||
|| GET_CODE (recog_data.operand[i]) == MULT
|
||
|| GET_CODE (recog_data.operand[i]) == MEM)
|
||
recog_data.operand[i] = walk_alter_subreg (recog_data.operand_loc[i]);
|
||
}
|
||
|
||
for (i = 0; i < recog_data.n_dups; i++)
|
||
{
|
||
if (GET_CODE (*recog_data.dup_loc[i]) == SUBREG)
|
||
*recog_data.dup_loc[i] = alter_subreg (recog_data.dup_loc[i]);
|
||
else if (GET_CODE (*recog_data.dup_loc[i]) == PLUS
|
||
|| GET_CODE (*recog_data.dup_loc[i]) == MULT
|
||
|| GET_CODE (*recog_data.dup_loc[i]) == MEM)
|
||
*recog_data.dup_loc[i] = walk_alter_subreg (recog_data.dup_loc[i]);
|
||
}
|
||
}
|
||
|
||
/* If X is a SUBREG, replace it with a REG or a MEM,
|
||
based on the thing it is a subreg of. */
|
||
|
||
rtx
|
||
alter_subreg (xp)
|
||
rtx *xp;
|
||
{
|
||
rtx x = *xp;
|
||
rtx y = SUBREG_REG (x);
|
||
|
||
/* simplify_subreg does not remove subreg from volatile references.
|
||
We are required to. */
|
||
if (GET_CODE (y) == MEM)
|
||
*xp = adjust_address (y, GET_MODE (x), SUBREG_BYTE (x));
|
||
else
|
||
{
|
||
rtx new = simplify_subreg (GET_MODE (x), y, GET_MODE (y),
|
||
SUBREG_BYTE (x));
|
||
|
||
if (new != 0)
|
||
*xp = new;
|
||
/* Simplify_subreg can't handle some REG cases, but we have to. */
|
||
else if (GET_CODE (y) == REG)
|
||
{
|
||
unsigned int regno = subreg_hard_regno (x, 1);
|
||
PUT_CODE (x, REG);
|
||
REGNO (x) = regno;
|
||
ORIGINAL_REGNO (x) = ORIGINAL_REGNO (y);
|
||
/* This field has a different meaning for REGs and SUBREGs. Make
|
||
sure to clear it! */
|
||
x->used = 0;
|
||
}
|
||
else
|
||
abort ();
|
||
}
|
||
|
||
return *xp;
|
||
}
|
||
|
||
/* Do alter_subreg on all the SUBREGs contained in X. */
|
||
|
||
static rtx
|
||
walk_alter_subreg (xp)
|
||
rtx *xp;
|
||
{
|
||
rtx x = *xp;
|
||
switch (GET_CODE (x))
|
||
{
|
||
case PLUS:
|
||
case MULT:
|
||
XEXP (x, 0) = walk_alter_subreg (&XEXP (x, 0));
|
||
XEXP (x, 1) = walk_alter_subreg (&XEXP (x, 1));
|
||
break;
|
||
|
||
case MEM:
|
||
XEXP (x, 0) = walk_alter_subreg (&XEXP (x, 0));
|
||
break;
|
||
|
||
case SUBREG:
|
||
return alter_subreg (xp);
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return *xp;
|
||
}
|
||
|
||
#ifdef HAVE_cc0
|
||
|
||
/* Given BODY, the body of a jump instruction, alter the jump condition
|
||
as required by the bits that are set in cc_status.flags.
|
||
Not all of the bits there can be handled at this level in all cases.
|
||
|
||
The value is normally 0.
|
||
1 means that the condition has become always true.
|
||
-1 means that the condition has become always false.
|
||
2 means that COND has been altered. */
|
||
|
||
static int
|
||
alter_cond (cond)
|
||
rtx cond;
|
||
{
|
||
int value = 0;
|
||
|
||
if (cc_status.flags & CC_REVERSED)
|
||
{
|
||
value = 2;
|
||
PUT_CODE (cond, swap_condition (GET_CODE (cond)));
|
||
}
|
||
|
||
if (cc_status.flags & CC_INVERTED)
|
||
{
|
||
value = 2;
|
||
PUT_CODE (cond, reverse_condition (GET_CODE (cond)));
|
||
}
|
||
|
||
if (cc_status.flags & CC_NOT_POSITIVE)
|
||
switch (GET_CODE (cond))
|
||
{
|
||
case LE:
|
||
case LEU:
|
||
case GEU:
|
||
/* Jump becomes unconditional. */
|
||
return 1;
|
||
|
||
case GT:
|
||
case GTU:
|
||
case LTU:
|
||
/* Jump becomes no-op. */
|
||
return -1;
|
||
|
||
case GE:
|
||
PUT_CODE (cond, EQ);
|
||
value = 2;
|
||
break;
|
||
|
||
case LT:
|
||
PUT_CODE (cond, NE);
|
||
value = 2;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
if (cc_status.flags & CC_NOT_NEGATIVE)
|
||
switch (GET_CODE (cond))
|
||
{
|
||
case GE:
|
||
case GEU:
|
||
/* Jump becomes unconditional. */
|
||
return 1;
|
||
|
||
case LT:
|
||
case LTU:
|
||
/* Jump becomes no-op. */
|
||
return -1;
|
||
|
||
case LE:
|
||
case LEU:
|
||
PUT_CODE (cond, EQ);
|
||
value = 2;
|
||
break;
|
||
|
||
case GT:
|
||
case GTU:
|
||
PUT_CODE (cond, NE);
|
||
value = 2;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
if (cc_status.flags & CC_NO_OVERFLOW)
|
||
switch (GET_CODE (cond))
|
||
{
|
||
case GEU:
|
||
/* Jump becomes unconditional. */
|
||
return 1;
|
||
|
||
case LEU:
|
||
PUT_CODE (cond, EQ);
|
||
value = 2;
|
||
break;
|
||
|
||
case GTU:
|
||
PUT_CODE (cond, NE);
|
||
value = 2;
|
||
break;
|
||
|
||
case LTU:
|
||
/* Jump becomes no-op. */
|
||
return -1;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
if (cc_status.flags & (CC_Z_IN_NOT_N | CC_Z_IN_N))
|
||
switch (GET_CODE (cond))
|
||
{
|
||
default:
|
||
abort ();
|
||
|
||
case NE:
|
||
PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? GE : LT);
|
||
value = 2;
|
||
break;
|
||
|
||
case EQ:
|
||
PUT_CODE (cond, cc_status.flags & CC_Z_IN_N ? LT : GE);
|
||
value = 2;
|
||
break;
|
||
}
|
||
|
||
if (cc_status.flags & CC_NOT_SIGNED)
|
||
/* The flags are valid if signed condition operators are converted
|
||
to unsigned. */
|
||
switch (GET_CODE (cond))
|
||
{
|
||
case LE:
|
||
PUT_CODE (cond, LEU);
|
||
value = 2;
|
||
break;
|
||
|
||
case LT:
|
||
PUT_CODE (cond, LTU);
|
||
value = 2;
|
||
break;
|
||
|
||
case GT:
|
||
PUT_CODE (cond, GTU);
|
||
value = 2;
|
||
break;
|
||
|
||
case GE:
|
||
PUT_CODE (cond, GEU);
|
||
value = 2;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return value;
|
||
}
|
||
#endif
|
||
|
||
/* Report inconsistency between the assembler template and the operands.
|
||
In an `asm', it's the user's fault; otherwise, the compiler's fault. */
|
||
|
||
void
|
||
output_operand_lossage VPARAMS ((const char *msgid, ...))
|
||
{
|
||
char *fmt_string;
|
||
char *new_message;
|
||
const char *pfx_str;
|
||
VA_OPEN (ap, msgid);
|
||
VA_FIXEDARG (ap, const char *, msgid);
|
||
|
||
pfx_str = this_is_asm_operands ? _("invalid `asm': ") : "output_operand: ";
|
||
asprintf (&fmt_string, "%s%s", pfx_str, _(msgid));
|
||
vasprintf (&new_message, fmt_string, ap);
|
||
|
||
if (this_is_asm_operands)
|
||
error_for_asm (this_is_asm_operands, "%s", new_message);
|
||
else
|
||
internal_error ("%s", new_message);
|
||
|
||
free (fmt_string);
|
||
free (new_message);
|
||
VA_CLOSE (ap);
|
||
}
|
||
|
||
/* Output of assembler code from a template, and its subroutines. */
|
||
|
||
/* Annotate the assembly with a comment describing the pattern and
|
||
alternative used. */
|
||
|
||
static void
|
||
output_asm_name ()
|
||
{
|
||
if (debug_insn)
|
||
{
|
||
int num = INSN_CODE (debug_insn);
|
||
fprintf (asm_out_file, "\t%s %d\t%s",
|
||
ASM_COMMENT_START, INSN_UID (debug_insn),
|
||
insn_data[num].name);
|
||
if (insn_data[num].n_alternatives > 1)
|
||
fprintf (asm_out_file, "/%d", which_alternative + 1);
|
||
#ifdef HAVE_ATTR_length
|
||
fprintf (asm_out_file, "\t[length = %d]",
|
||
get_attr_length (debug_insn));
|
||
#endif
|
||
/* Clear this so only the first assembler insn
|
||
of any rtl insn will get the special comment for -dp. */
|
||
debug_insn = 0;
|
||
}
|
||
}
|
||
|
||
/* If OP is a REG or MEM and we can find a MEM_EXPR corresponding to it
|
||
or its address, return that expr . Set *PADDRESSP to 1 if the expr
|
||
corresponds to the address of the object and 0 if to the object. */
|
||
|
||
static tree
|
||
get_mem_expr_from_op (op, paddressp)
|
||
rtx op;
|
||
int *paddressp;
|
||
{
|
||
tree expr;
|
||
int inner_addressp;
|
||
|
||
*paddressp = 0;
|
||
|
||
if (GET_CODE (op) == REG && ORIGINAL_REGNO (op) >= FIRST_PSEUDO_REGISTER)
|
||
return REGNO_DECL (ORIGINAL_REGNO (op));
|
||
else if (GET_CODE (op) != MEM)
|
||
return 0;
|
||
|
||
if (MEM_EXPR (op) != 0)
|
||
return MEM_EXPR (op);
|
||
|
||
/* Otherwise we have an address, so indicate it and look at the address. */
|
||
*paddressp = 1;
|
||
op = XEXP (op, 0);
|
||
|
||
/* First check if we have a decl for the address, then look at the right side
|
||
if it is a PLUS. Otherwise, strip off arithmetic and keep looking.
|
||
But don't allow the address to itself be indirect. */
|
||
if ((expr = get_mem_expr_from_op (op, &inner_addressp)) && ! inner_addressp)
|
||
return expr;
|
||
else if (GET_CODE (op) == PLUS
|
||
&& (expr = get_mem_expr_from_op (XEXP (op, 1), &inner_addressp)))
|
||
return expr;
|
||
|
||
while (GET_RTX_CLASS (GET_CODE (op)) == '1'
|
||
|| GET_RTX_CLASS (GET_CODE (op)) == '2')
|
||
op = XEXP (op, 0);
|
||
|
||
expr = get_mem_expr_from_op (op, &inner_addressp);
|
||
return inner_addressp ? 0 : expr;
|
||
}
|
||
|
||
/* Output operand names for assembler instructions. OPERANDS is the
|
||
operand vector, OPORDER is the order to write the operands, and NOPS
|
||
is the number of operands to write. */
|
||
|
||
static void
|
||
output_asm_operand_names (operands, oporder, nops)
|
||
rtx *operands;
|
||
int *oporder;
|
||
int nops;
|
||
{
|
||
int wrote = 0;
|
||
int i;
|
||
|
||
for (i = 0; i < nops; i++)
|
||
{
|
||
int addressp;
|
||
tree expr = get_mem_expr_from_op (operands[oporder[i]], &addressp);
|
||
|
||
if (expr)
|
||
{
|
||
fprintf (asm_out_file, "%c%s %s",
|
||
wrote ? ',' : '\t', wrote ? "" : ASM_COMMENT_START,
|
||
addressp ? "*" : "");
|
||
print_mem_expr (asm_out_file, expr);
|
||
wrote = 1;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Output text from TEMPLATE to the assembler output file,
|
||
obeying %-directions to substitute operands taken from
|
||
the vector OPERANDS.
|
||
|
||
%N (for N a digit) means print operand N in usual manner.
|
||
%lN means require operand N to be a CODE_LABEL or LABEL_REF
|
||
and print the label name with no punctuation.
|
||
%cN means require operand N to be a constant
|
||
and print the constant expression with no punctuation.
|
||
%aN means expect operand N to be a memory address
|
||
(not a memory reference!) and print a reference
|
||
to that address.
|
||
%nN means expect operand N to be a constant
|
||
and print a constant expression for minus the value
|
||
of the operand, with no other punctuation. */
|
||
|
||
void
|
||
output_asm_insn (template, operands)
|
||
const char *template;
|
||
rtx *operands;
|
||
{
|
||
const char *p;
|
||
int c;
|
||
#ifdef ASSEMBLER_DIALECT
|
||
int dialect = 0;
|
||
#endif
|
||
int oporder[MAX_RECOG_OPERANDS];
|
||
char opoutput[MAX_RECOG_OPERANDS];
|
||
int ops = 0;
|
||
|
||
/* An insn may return a null string template
|
||
in a case where no assembler code is needed. */
|
||
if (*template == 0)
|
||
return;
|
||
|
||
memset (opoutput, 0, sizeof opoutput);
|
||
p = template;
|
||
putc ('\t', asm_out_file);
|
||
|
||
#ifdef ASM_OUTPUT_OPCODE
|
||
ASM_OUTPUT_OPCODE (asm_out_file, p);
|
||
#endif
|
||
|
||
while ((c = *p++))
|
||
switch (c)
|
||
{
|
||
case '\n':
|
||
if (flag_verbose_asm)
|
||
output_asm_operand_names (operands, oporder, ops);
|
||
if (flag_print_asm_name)
|
||
output_asm_name ();
|
||
|
||
ops = 0;
|
||
memset (opoutput, 0, sizeof opoutput);
|
||
|
||
putc (c, asm_out_file);
|
||
#ifdef ASM_OUTPUT_OPCODE
|
||
while ((c = *p) == '\t')
|
||
{
|
||
putc (c, asm_out_file);
|
||
p++;
|
||
}
|
||
ASM_OUTPUT_OPCODE (asm_out_file, p);
|
||
#endif
|
||
break;
|
||
|
||
#ifdef ASSEMBLER_DIALECT
|
||
case '{':
|
||
{
|
||
int i;
|
||
|
||
if (dialect)
|
||
output_operand_lossage ("nested assembly dialect alternatives");
|
||
else
|
||
dialect = 1;
|
||
|
||
/* If we want the first dialect, do nothing. Otherwise, skip
|
||
DIALECT_NUMBER of strings ending with '|'. */
|
||
for (i = 0; i < dialect_number; i++)
|
||
{
|
||
while (*p && *p != '}' && *p++ != '|')
|
||
;
|
||
if (*p == '}')
|
||
break;
|
||
if (*p == '|')
|
||
p++;
|
||
}
|
||
|
||
if (*p == '\0')
|
||
output_operand_lossage ("unterminated assembly dialect alternative");
|
||
}
|
||
break;
|
||
|
||
case '|':
|
||
if (dialect)
|
||
{
|
||
/* Skip to close brace. */
|
||
do
|
||
{
|
||
if (*p == '\0')
|
||
{
|
||
output_operand_lossage ("unterminated assembly dialect alternative");
|
||
break;
|
||
}
|
||
}
|
||
while (*p++ != '}');
|
||
dialect = 0;
|
||
}
|
||
else
|
||
putc (c, asm_out_file);
|
||
break;
|
||
|
||
case '}':
|
||
if (! dialect)
|
||
putc (c, asm_out_file);
|
||
dialect = 0;
|
||
break;
|
||
#endif
|
||
|
||
case '%':
|
||
/* %% outputs a single %. */
|
||
if (*p == '%')
|
||
{
|
||
p++;
|
||
putc (c, asm_out_file);
|
||
}
|
||
/* %= outputs a number which is unique to each insn in the entire
|
||
compilation. This is useful for making local labels that are
|
||
referred to more than once in a given insn. */
|
||
else if (*p == '=')
|
||
{
|
||
p++;
|
||
fprintf (asm_out_file, "%d", insn_counter);
|
||
}
|
||
/* % followed by a letter and some digits
|
||
outputs an operand in a special way depending on the letter.
|
||
Letters `acln' are implemented directly.
|
||
Other letters are passed to `output_operand' so that
|
||
the PRINT_OPERAND macro can define them. */
|
||
else if (ISALPHA (*p))
|
||
{
|
||
int letter = *p++;
|
||
c = atoi (p);
|
||
|
||
if (! ISDIGIT (*p))
|
||
output_operand_lossage ("operand number missing after %%-letter");
|
||
else if (this_is_asm_operands
|
||
&& (c < 0 || (unsigned int) c >= insn_noperands))
|
||
output_operand_lossage ("operand number out of range");
|
||
else if (letter == 'l')
|
||
output_asm_label (operands[c]);
|
||
else if (letter == 'a')
|
||
output_address (operands[c]);
|
||
else if (letter == 'c')
|
||
{
|
||
if (CONSTANT_ADDRESS_P (operands[c]))
|
||
output_addr_const (asm_out_file, operands[c]);
|
||
else
|
||
output_operand (operands[c], 'c');
|
||
}
|
||
else if (letter == 'n')
|
||
{
|
||
if (GET_CODE (operands[c]) == CONST_INT)
|
||
fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC,
|
||
- INTVAL (operands[c]));
|
||
else
|
||
{
|
||
putc ('-', asm_out_file);
|
||
output_addr_const (asm_out_file, operands[c]);
|
||
}
|
||
}
|
||
else
|
||
output_operand (operands[c], letter);
|
||
|
||
if (!opoutput[c])
|
||
oporder[ops++] = c;
|
||
opoutput[c] = 1;
|
||
|
||
while (ISDIGIT (c = *p))
|
||
p++;
|
||
}
|
||
/* % followed by a digit outputs an operand the default way. */
|
||
else if (ISDIGIT (*p))
|
||
{
|
||
c = atoi (p);
|
||
if (this_is_asm_operands
|
||
&& (c < 0 || (unsigned int) c >= insn_noperands))
|
||
output_operand_lossage ("operand number out of range");
|
||
else
|
||
output_operand (operands[c], 0);
|
||
|
||
if (!opoutput[c])
|
||
oporder[ops++] = c;
|
||
opoutput[c] = 1;
|
||
|
||
while (ISDIGIT (c = *p))
|
||
p++;
|
||
}
|
||
/* % followed by punctuation: output something for that
|
||
punctuation character alone, with no operand.
|
||
The PRINT_OPERAND macro decides what is actually done. */
|
||
#ifdef PRINT_OPERAND_PUNCT_VALID_P
|
||
else if (PRINT_OPERAND_PUNCT_VALID_P ((unsigned char) *p))
|
||
output_operand (NULL_RTX, *p++);
|
||
#endif
|
||
else
|
||
output_operand_lossage ("invalid %%-code");
|
||
break;
|
||
|
||
default:
|
||
putc (c, asm_out_file);
|
||
}
|
||
|
||
/* Write out the variable names for operands, if we know them. */
|
||
if (flag_verbose_asm)
|
||
output_asm_operand_names (operands, oporder, ops);
|
||
if (flag_print_asm_name)
|
||
output_asm_name ();
|
||
|
||
putc ('\n', asm_out_file);
|
||
}
|
||
|
||
/* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
|
||
|
||
void
|
||
output_asm_label (x)
|
||
rtx x;
|
||
{
|
||
char buf[256];
|
||
|
||
if (GET_CODE (x) == LABEL_REF)
|
||
x = XEXP (x, 0);
|
||
if (GET_CODE (x) == CODE_LABEL
|
||
|| (GET_CODE (x) == NOTE
|
||
&& NOTE_LINE_NUMBER (x) == NOTE_INSN_DELETED_LABEL))
|
||
ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
|
||
else
|
||
output_operand_lossage ("`%%l' operand isn't a label");
|
||
|
||
assemble_name (asm_out_file, buf);
|
||
}
|
||
|
||
/* Print operand X using machine-dependent assembler syntax.
|
||
The macro PRINT_OPERAND is defined just to control this function.
|
||
CODE is a non-digit that preceded the operand-number in the % spec,
|
||
such as 'z' if the spec was `%z3'. CODE is 0 if there was no char
|
||
between the % and the digits.
|
||
When CODE is a non-letter, X is 0.
|
||
|
||
The meanings of the letters are machine-dependent and controlled
|
||
by PRINT_OPERAND. */
|
||
|
||
static void
|
||
output_operand (x, code)
|
||
rtx x;
|
||
int code ATTRIBUTE_UNUSED;
|
||
{
|
||
if (x && GET_CODE (x) == SUBREG)
|
||
x = alter_subreg (&x);
|
||
|
||
/* If X is a pseudo-register, abort now rather than writing trash to the
|
||
assembler file. */
|
||
|
||
if (x && GET_CODE (x) == REG && REGNO (x) >= FIRST_PSEUDO_REGISTER)
|
||
abort ();
|
||
|
||
PRINT_OPERAND (asm_out_file, x, code);
|
||
}
|
||
|
||
/* Print a memory reference operand for address X
|
||
using machine-dependent assembler syntax.
|
||
The macro PRINT_OPERAND_ADDRESS exists just to control this function. */
|
||
|
||
void
|
||
output_address (x)
|
||
rtx x;
|
||
{
|
||
walk_alter_subreg (&x);
|
||
PRINT_OPERAND_ADDRESS (asm_out_file, x);
|
||
}
|
||
|
||
/* Print an integer constant expression in assembler syntax.
|
||
Addition and subtraction are the only arithmetic
|
||
that may appear in these expressions. */
|
||
|
||
void
|
||
output_addr_const (file, x)
|
||
FILE *file;
|
||
rtx x;
|
||
{
|
||
char buf[256];
|
||
|
||
restart:
|
||
switch (GET_CODE (x))
|
||
{
|
||
case PC:
|
||
putc ('.', file);
|
||
break;
|
||
|
||
case SYMBOL_REF:
|
||
#ifdef ASM_OUTPUT_SYMBOL_REF
|
||
ASM_OUTPUT_SYMBOL_REF (file, x);
|
||
#else
|
||
assemble_name (file, XSTR (x, 0));
|
||
#endif
|
||
break;
|
||
|
||
case LABEL_REF:
|
||
x = XEXP (x, 0);
|
||
/* Fall through. */
|
||
case CODE_LABEL:
|
||
ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (x));
|
||
#ifdef ASM_OUTPUT_LABEL_REF
|
||
ASM_OUTPUT_LABEL_REF (file, buf);
|
||
#else
|
||
assemble_name (file, buf);
|
||
#endif
|
||
break;
|
||
|
||
case CONST_INT:
|
||
fprintf (file, HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
|
||
break;
|
||
|
||
case CONST:
|
||
/* This used to output parentheses around the expression,
|
||
but that does not work on the 386 (either ATT or BSD assembler). */
|
||
output_addr_const (file, XEXP (x, 0));
|
||
break;
|
||
|
||
case CONST_DOUBLE:
|
||
if (GET_MODE (x) == VOIDmode)
|
||
{
|
||
/* We can use %d if the number is one word and positive. */
|
||
if (CONST_DOUBLE_HIGH (x))
|
||
fprintf (file, HOST_WIDE_INT_PRINT_DOUBLE_HEX,
|
||
CONST_DOUBLE_HIGH (x), CONST_DOUBLE_LOW (x));
|
||
else if (CONST_DOUBLE_LOW (x) < 0)
|
||
fprintf (file, HOST_WIDE_INT_PRINT_HEX, CONST_DOUBLE_LOW (x));
|
||
else
|
||
fprintf (file, HOST_WIDE_INT_PRINT_DEC, CONST_DOUBLE_LOW (x));
|
||
}
|
||
else
|
||
/* We can't handle floating point constants;
|
||
PRINT_OPERAND must handle them. */
|
||
output_operand_lossage ("floating constant misused");
|
||
break;
|
||
|
||
case PLUS:
|
||
/* Some assemblers need integer constants to appear last (eg masm). */
|
||
if (GET_CODE (XEXP (x, 0)) == CONST_INT)
|
||
{
|
||
output_addr_const (file, XEXP (x, 1));
|
||
if (INTVAL (XEXP (x, 0)) >= 0)
|
||
fprintf (file, "+");
|
||
output_addr_const (file, XEXP (x, 0));
|
||
}
|
||
else
|
||
{
|
||
output_addr_const (file, XEXP (x, 0));
|
||
if (GET_CODE (XEXP (x, 1)) != CONST_INT
|
||
|| INTVAL (XEXP (x, 1)) >= 0)
|
||
fprintf (file, "+");
|
||
output_addr_const (file, XEXP (x, 1));
|
||
}
|
||
break;
|
||
|
||
case MINUS:
|
||
/* Avoid outputting things like x-x or x+5-x,
|
||
since some assemblers can't handle that. */
|
||
x = simplify_subtraction (x);
|
||
if (GET_CODE (x) != MINUS)
|
||
goto restart;
|
||
|
||
output_addr_const (file, XEXP (x, 0));
|
||
fprintf (file, "-");
|
||
if ((GET_CODE (XEXP (x, 1)) == CONST_INT && INTVAL (XEXP (x, 1)) >= 0)
|
||
|| GET_CODE (XEXP (x, 1)) == PC
|
||
|| GET_CODE (XEXP (x, 1)) == SYMBOL_REF)
|
||
output_addr_const (file, XEXP (x, 1));
|
||
else
|
||
{
|
||
fputs (targetm.asm_out.open_paren, file);
|
||
output_addr_const (file, XEXP (x, 1));
|
||
fputs (targetm.asm_out.close_paren, file);
|
||
}
|
||
break;
|
||
|
||
case ZERO_EXTEND:
|
||
case SIGN_EXTEND:
|
||
case SUBREG:
|
||
output_addr_const (file, XEXP (x, 0));
|
||
break;
|
||
|
||
default:
|
||
#ifdef OUTPUT_ADDR_CONST_EXTRA
|
||
OUTPUT_ADDR_CONST_EXTRA (file, x, fail);
|
||
break;
|
||
|
||
fail:
|
||
#endif
|
||
output_operand_lossage ("invalid expression as operand");
|
||
}
|
||
}
|
||
|
||
/* A poor man's fprintf, with the added features of %I, %R, %L, and %U.
|
||
%R prints the value of REGISTER_PREFIX.
|
||
%L prints the value of LOCAL_LABEL_PREFIX.
|
||
%U prints the value of USER_LABEL_PREFIX.
|
||
%I prints the value of IMMEDIATE_PREFIX.
|
||
%O runs ASM_OUTPUT_OPCODE to transform what follows in the string.
|
||
Also supported are %d, %x, %s, %e, %f, %g and %%.
|
||
|
||
We handle alternate assembler dialects here, just like output_asm_insn. */
|
||
|
||
void
|
||
asm_fprintf VPARAMS ((FILE *file, const char *p, ...))
|
||
{
|
||
char buf[10];
|
||
char *q, c;
|
||
|
||
VA_OPEN (argptr, p);
|
||
VA_FIXEDARG (argptr, FILE *, file);
|
||
VA_FIXEDARG (argptr, const char *, p);
|
||
|
||
buf[0] = '%';
|
||
|
||
while ((c = *p++))
|
||
switch (c)
|
||
{
|
||
#ifdef ASSEMBLER_DIALECT
|
||
case '{':
|
||
{
|
||
int i;
|
||
|
||
/* If we want the first dialect, do nothing. Otherwise, skip
|
||
DIALECT_NUMBER of strings ending with '|'. */
|
||
for (i = 0; i < dialect_number; i++)
|
||
{
|
||
while (*p && *p++ != '|')
|
||
;
|
||
|
||
if (*p == '|')
|
||
p++;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case '|':
|
||
/* Skip to close brace. */
|
||
while (*p && *p++ != '}')
|
||
;
|
||
break;
|
||
|
||
case '}':
|
||
break;
|
||
#endif
|
||
|
||
case '%':
|
||
c = *p++;
|
||
q = &buf[1];
|
||
while (ISDIGIT (c) || c == '.')
|
||
{
|
||
*q++ = c;
|
||
c = *p++;
|
||
}
|
||
switch (c)
|
||
{
|
||
case '%':
|
||
fprintf (file, "%%");
|
||
break;
|
||
|
||
case 'd': case 'i': case 'u':
|
||
case 'x': case 'p': case 'X':
|
||
case 'o':
|
||
*q++ = c;
|
||
*q = 0;
|
||
fprintf (file, buf, va_arg (argptr, int));
|
||
break;
|
||
|
||
case 'w':
|
||
/* This is a prefix to the 'd', 'i', 'u', 'x', 'p', and 'X' cases,
|
||
but we do not check for those cases. It means that the value
|
||
is a HOST_WIDE_INT, which may be either `int' or `long'. */
|
||
|
||
#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
|
||
#else
|
||
#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
|
||
*q++ = 'l';
|
||
#else
|
||
*q++ = 'l';
|
||
*q++ = 'l';
|
||
#endif
|
||
#endif
|
||
|
||
*q++ = *p++;
|
||
*q = 0;
|
||
fprintf (file, buf, va_arg (argptr, HOST_WIDE_INT));
|
||
break;
|
||
|
||
case 'l':
|
||
*q++ = c;
|
||
*q++ = *p++;
|
||
*q = 0;
|
||
fprintf (file, buf, va_arg (argptr, long));
|
||
break;
|
||
|
||
case 'e':
|
||
case 'f':
|
||
case 'g':
|
||
*q++ = c;
|
||
*q = 0;
|
||
fprintf (file, buf, va_arg (argptr, double));
|
||
break;
|
||
|
||
case 's':
|
||
*q++ = c;
|
||
*q = 0;
|
||
fprintf (file, buf, va_arg (argptr, char *));
|
||
break;
|
||
|
||
case 'O':
|
||
#ifdef ASM_OUTPUT_OPCODE
|
||
ASM_OUTPUT_OPCODE (asm_out_file, p);
|
||
#endif
|
||
break;
|
||
|
||
case 'R':
|
||
#ifdef REGISTER_PREFIX
|
||
fprintf (file, "%s", REGISTER_PREFIX);
|
||
#endif
|
||
break;
|
||
|
||
case 'I':
|
||
#ifdef IMMEDIATE_PREFIX
|
||
fprintf (file, "%s", IMMEDIATE_PREFIX);
|
||
#endif
|
||
break;
|
||
|
||
case 'L':
|
||
#ifdef LOCAL_LABEL_PREFIX
|
||
fprintf (file, "%s", LOCAL_LABEL_PREFIX);
|
||
#endif
|
||
break;
|
||
|
||
case 'U':
|
||
fputs (user_label_prefix, file);
|
||
break;
|
||
|
||
#ifdef ASM_FPRINTF_EXTENSIONS
|
||
/* Upper case letters are reserved for general use by asm_fprintf
|
||
and so are not available to target specific code. In order to
|
||
prevent the ASM_FPRINTF_EXTENSIONS macro from using them then,
|
||
they are defined here. As they get turned into real extensions
|
||
to asm_fprintf they should be removed from this list. */
|
||
case 'A': case 'B': case 'C': case 'D': case 'E':
|
||
case 'F': case 'G': case 'H': case 'J': case 'K':
|
||
case 'M': case 'N': case 'P': case 'Q': case 'S':
|
||
case 'T': case 'V': case 'W': case 'Y': case 'Z':
|
||
break;
|
||
|
||
ASM_FPRINTF_EXTENSIONS (file, argptr, p)
|
||
#endif
|
||
default:
|
||
abort ();
|
||
}
|
||
break;
|
||
|
||
default:
|
||
fputc (c, file);
|
||
}
|
||
VA_CLOSE (argptr);
|
||
}
|
||
|
||
/* Split up a CONST_DOUBLE or integer constant rtx
|
||
into two rtx's for single words,
|
||
storing in *FIRST the word that comes first in memory in the target
|
||
and in *SECOND the other. */
|
||
|
||
void
|
||
split_double (value, first, second)
|
||
rtx value;
|
||
rtx *first, *second;
|
||
{
|
||
if (GET_CODE (value) == CONST_INT)
|
||
{
|
||
if (HOST_BITS_PER_WIDE_INT >= (2 * BITS_PER_WORD))
|
||
{
|
||
/* In this case the CONST_INT holds both target words.
|
||
Extract the bits from it into two word-sized pieces.
|
||
Sign extend each half to HOST_WIDE_INT. */
|
||
unsigned HOST_WIDE_INT low, high;
|
||
unsigned HOST_WIDE_INT mask, sign_bit, sign_extend;
|
||
|
||
/* Set sign_bit to the most significant bit of a word. */
|
||
sign_bit = 1;
|
||
sign_bit <<= BITS_PER_WORD - 1;
|
||
|
||
/* Set mask so that all bits of the word are set. We could
|
||
have used 1 << BITS_PER_WORD instead of basing the
|
||
calculation on sign_bit. However, on machines where
|
||
HOST_BITS_PER_WIDE_INT == BITS_PER_WORD, it could cause a
|
||
compiler warning, even though the code would never be
|
||
executed. */
|
||
mask = sign_bit << 1;
|
||
mask--;
|
||
|
||
/* Set sign_extend as any remaining bits. */
|
||
sign_extend = ~mask;
|
||
|
||
/* Pick the lower word and sign-extend it. */
|
||
low = INTVAL (value);
|
||
low &= mask;
|
||
if (low & sign_bit)
|
||
low |= sign_extend;
|
||
|
||
/* Pick the higher word, shifted to the least significant
|
||
bits, and sign-extend it. */
|
||
high = INTVAL (value);
|
||
high >>= BITS_PER_WORD - 1;
|
||
high >>= 1;
|
||
high &= mask;
|
||
if (high & sign_bit)
|
||
high |= sign_extend;
|
||
|
||
/* Store the words in the target machine order. */
|
||
if (WORDS_BIG_ENDIAN)
|
||
{
|
||
*first = GEN_INT (high);
|
||
*second = GEN_INT (low);
|
||
}
|
||
else
|
||
{
|
||
*first = GEN_INT (low);
|
||
*second = GEN_INT (high);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* The rule for using CONST_INT for a wider mode
|
||
is that we regard the value as signed.
|
||
So sign-extend it. */
|
||
rtx high = (INTVAL (value) < 0 ? constm1_rtx : const0_rtx);
|
||
if (WORDS_BIG_ENDIAN)
|
||
{
|
||
*first = high;
|
||
*second = value;
|
||
}
|
||
else
|
||
{
|
||
*first = value;
|
||
*second = high;
|
||
}
|
||
}
|
||
}
|
||
else if (GET_CODE (value) != CONST_DOUBLE)
|
||
{
|
||
if (WORDS_BIG_ENDIAN)
|
||
{
|
||
*first = const0_rtx;
|
||
*second = value;
|
||
}
|
||
else
|
||
{
|
||
*first = value;
|
||
*second = const0_rtx;
|
||
}
|
||
}
|
||
else if (GET_MODE (value) == VOIDmode
|
||
/* This is the old way we did CONST_DOUBLE integers. */
|
||
|| GET_MODE_CLASS (GET_MODE (value)) == MODE_INT)
|
||
{
|
||
/* In an integer, the words are defined as most and least significant.
|
||
So order them by the target's convention. */
|
||
if (WORDS_BIG_ENDIAN)
|
||
{
|
||
*first = GEN_INT (CONST_DOUBLE_HIGH (value));
|
||
*second = GEN_INT (CONST_DOUBLE_LOW (value));
|
||
}
|
||
else
|
||
{
|
||
*first = GEN_INT (CONST_DOUBLE_LOW (value));
|
||
*second = GEN_INT (CONST_DOUBLE_HIGH (value));
|
||
}
|
||
}
|
||
else
|
||
{
|
||
#ifdef REAL_ARITHMETIC
|
||
REAL_VALUE_TYPE r;
|
||
long l[2];
|
||
REAL_VALUE_FROM_CONST_DOUBLE (r, value);
|
||
|
||
/* Note, this converts the REAL_VALUE_TYPE to the target's
|
||
format, splits up the floating point double and outputs
|
||
exactly 32 bits of it into each of l[0] and l[1] --
|
||
not necessarily BITS_PER_WORD bits. */
|
||
REAL_VALUE_TO_TARGET_DOUBLE (r, l);
|
||
|
||
/* If 32 bits is an entire word for the target, but not for the host,
|
||
then sign-extend on the host so that the number will look the same
|
||
way on the host that it would on the target. See for instance
|
||
simplify_unary_operation. The #if is needed to avoid compiler
|
||
warnings. */
|
||
|
||
#if HOST_BITS_PER_LONG > 32
|
||
if (BITS_PER_WORD < HOST_BITS_PER_LONG && BITS_PER_WORD == 32)
|
||
{
|
||
if (l[0] & ((long) 1 << 31))
|
||
l[0] |= ((long) (-1) << 32);
|
||
if (l[1] & ((long) 1 << 31))
|
||
l[1] |= ((long) (-1) << 32);
|
||
}
|
||
#endif
|
||
|
||
*first = GEN_INT ((HOST_WIDE_INT) l[0]);
|
||
*second = GEN_INT ((HOST_WIDE_INT) l[1]);
|
||
#else
|
||
if ((HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
|
||
|| HOST_BITS_PER_WIDE_INT != BITS_PER_WORD)
|
||
&& ! flag_pretend_float)
|
||
abort ();
|
||
|
||
if (
|
||
#ifdef HOST_WORDS_BIG_ENDIAN
|
||
WORDS_BIG_ENDIAN
|
||
#else
|
||
! WORDS_BIG_ENDIAN
|
||
#endif
|
||
)
|
||
{
|
||
/* Host and target agree => no need to swap. */
|
||
*first = GEN_INT (CONST_DOUBLE_LOW (value));
|
||
*second = GEN_INT (CONST_DOUBLE_HIGH (value));
|
||
}
|
||
else
|
||
{
|
||
*second = GEN_INT (CONST_DOUBLE_LOW (value));
|
||
*first = GEN_INT (CONST_DOUBLE_HIGH (value));
|
||
}
|
||
#endif /* no REAL_ARITHMETIC */
|
||
}
|
||
}
|
||
|
||
/* Return nonzero if this function has no function calls. */
|
||
|
||
int
|
||
leaf_function_p ()
|
||
{
|
||
rtx insn;
|
||
rtx link;
|
||
|
||
if (current_function_profile || profile_arc_flag)
|
||
return 0;
|
||
|
||
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
|
||
{
|
||
if (GET_CODE (insn) == CALL_INSN
|
||
&& ! SIBLING_CALL_P (insn))
|
||
return 0;
|
||
if (GET_CODE (insn) == INSN
|
||
&& GET_CODE (PATTERN (insn)) == SEQUENCE
|
||
&& GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == CALL_INSN
|
||
&& ! SIBLING_CALL_P (XVECEXP (PATTERN (insn), 0, 0)))
|
||
return 0;
|
||
}
|
||
for (link = current_function_epilogue_delay_list;
|
||
link;
|
||
link = XEXP (link, 1))
|
||
{
|
||
insn = XEXP (link, 0);
|
||
|
||
if (GET_CODE (insn) == CALL_INSN
|
||
&& ! SIBLING_CALL_P (insn))
|
||
return 0;
|
||
if (GET_CODE (insn) == INSN
|
||
&& GET_CODE (PATTERN (insn)) == SEQUENCE
|
||
&& GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == CALL_INSN
|
||
&& ! SIBLING_CALL_P (XVECEXP (PATTERN (insn), 0, 0)))
|
||
return 0;
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Return 1 if branch is an forward branch.
|
||
Uses insn_shuid array, so it works only in the final pass. May be used by
|
||
output templates to customary add branch prediction hints.
|
||
*/
|
||
int
|
||
final_forward_branch_p (insn)
|
||
rtx insn;
|
||
{
|
||
int insn_id, label_id;
|
||
if (!uid_shuid)
|
||
abort ();
|
||
insn_id = INSN_SHUID (insn);
|
||
label_id = INSN_SHUID (JUMP_LABEL (insn));
|
||
/* We've hit some insns that does not have id information available. */
|
||
if (!insn_id || !label_id)
|
||
abort ();
|
||
return insn_id < label_id;
|
||
}
|
||
|
||
/* On some machines, a function with no call insns
|
||
can run faster if it doesn't create its own register window.
|
||
When output, the leaf function should use only the "output"
|
||
registers. Ordinarily, the function would be compiled to use
|
||
the "input" registers to find its arguments; it is a candidate
|
||
for leaf treatment if it uses only the "input" registers.
|
||
Leaf function treatment means renumbering so the function
|
||
uses the "output" registers instead. */
|
||
|
||
#ifdef LEAF_REGISTERS
|
||
|
||
/* Return 1 if this function uses only the registers that can be
|
||
safely renumbered. */
|
||
|
||
int
|
||
only_leaf_regs_used ()
|
||
{
|
||
int i;
|
||
char *permitted_reg_in_leaf_functions = LEAF_REGISTERS;
|
||
|
||
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
||
if ((regs_ever_live[i] || global_regs[i])
|
||
&& ! permitted_reg_in_leaf_functions[i])
|
||
return 0;
|
||
|
||
if (current_function_uses_pic_offset_table
|
||
&& pic_offset_table_rtx != 0
|
||
&& GET_CODE (pic_offset_table_rtx) == REG
|
||
&& ! permitted_reg_in_leaf_functions[REGNO (pic_offset_table_rtx)])
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Scan all instructions and renumber all registers into those
|
||
available in leaf functions. */
|
||
|
||
static void
|
||
leaf_renumber_regs (first)
|
||
rtx first;
|
||
{
|
||
rtx insn;
|
||
|
||
/* Renumber only the actual patterns.
|
||
The reg-notes can contain frame pointer refs,
|
||
and renumbering them could crash, and should not be needed. */
|
||
for (insn = first; insn; insn = NEXT_INSN (insn))
|
||
if (INSN_P (insn))
|
||
leaf_renumber_regs_insn (PATTERN (insn));
|
||
for (insn = current_function_epilogue_delay_list;
|
||
insn;
|
||
insn = XEXP (insn, 1))
|
||
if (INSN_P (XEXP (insn, 0)))
|
||
leaf_renumber_regs_insn (PATTERN (XEXP (insn, 0)));
|
||
}
|
||
|
||
/* Scan IN_RTX and its subexpressions, and renumber all regs into those
|
||
available in leaf functions. */
|
||
|
||
void
|
||
leaf_renumber_regs_insn (in_rtx)
|
||
rtx in_rtx;
|
||
{
|
||
int i, j;
|
||
const char *format_ptr;
|
||
|
||
if (in_rtx == 0)
|
||
return;
|
||
|
||
/* Renumber all input-registers into output-registers.
|
||
renumbered_regs would be 1 for an output-register;
|
||
they */
|
||
|
||
if (GET_CODE (in_rtx) == REG)
|
||
{
|
||
int newreg;
|
||
|
||
/* Don't renumber the same reg twice. */
|
||
if (in_rtx->used)
|
||
return;
|
||
|
||
newreg = REGNO (in_rtx);
|
||
/* Don't try to renumber pseudo regs. It is possible for a pseudo reg
|
||
to reach here as part of a REG_NOTE. */
|
||
if (newreg >= FIRST_PSEUDO_REGISTER)
|
||
{
|
||
in_rtx->used = 1;
|
||
return;
|
||
}
|
||
newreg = LEAF_REG_REMAP (newreg);
|
||
if (newreg < 0)
|
||
abort ();
|
||
regs_ever_live[REGNO (in_rtx)] = 0;
|
||
regs_ever_live[newreg] = 1;
|
||
REGNO (in_rtx) = newreg;
|
||
in_rtx->used = 1;
|
||
}
|
||
|
||
if (INSN_P (in_rtx))
|
||
{
|
||
/* Inside a SEQUENCE, we find insns.
|
||
Renumber just the patterns of these insns,
|
||
just as we do for the top-level insns. */
|
||
leaf_renumber_regs_insn (PATTERN (in_rtx));
|
||
return;
|
||
}
|
||
|
||
format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx));
|
||
|
||
for (i = 0; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
|
||
switch (*format_ptr++)
|
||
{
|
||
case 'e':
|
||
leaf_renumber_regs_insn (XEXP (in_rtx, i));
|
||
break;
|
||
|
||
case 'E':
|
||
if (NULL != XVEC (in_rtx, i))
|
||
{
|
||
for (j = 0; j < XVECLEN (in_rtx, i); j++)
|
||
leaf_renumber_regs_insn (XVECEXP (in_rtx, i, j));
|
||
}
|
||
break;
|
||
|
||
case 'S':
|
||
case 's':
|
||
case '0':
|
||
case 'i':
|
||
case 'w':
|
||
case 'n':
|
||
case 'u':
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
#endif
|