704 lines
18 KiB
C
704 lines
18 KiB
C
/* RTL utility routines.
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Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002
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Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "rtl.h"
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#include "real.h"
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#include "ggc.h"
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#include "errors.h"
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/* Calculate the format for CONST_DOUBLE. This depends on the relative
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widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
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We need to go out to 0wwwww, since REAL_ARITHMETIC assumes 16-bits
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per element in REAL_VALUE_TYPE.
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This is duplicated in gengenrtl.c.
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A number of places assume that there are always at least two 'w'
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slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
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#ifdef REAL_ARITHMETIC
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# if MAX_LONG_DOUBLE_TYPE_SIZE == 96
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# define REAL_WIDTH \
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(11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
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# else
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# if MAX_LONG_DOUBLE_TYPE_SIZE == 128
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# define REAL_WIDTH \
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(19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
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# else
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# if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
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# define REAL_WIDTH \
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(7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
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# endif
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# endif
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# endif
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#endif /* REAL_ARITHMETIC */
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#ifndef REAL_WIDTH
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# if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
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# define REAL_WIDTH 2
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# else
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# if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
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# define REAL_WIDTH 3
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# else
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# if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
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# define REAL_WIDTH 4
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# endif
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# endif
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# endif
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#endif /* REAL_WIDTH */
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#if REAL_WIDTH == 1
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# define CONST_DOUBLE_FORMAT "0ww"
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#else
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# if REAL_WIDTH == 2
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# define CONST_DOUBLE_FORMAT "0ww"
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# else
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# if REAL_WIDTH == 3
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# define CONST_DOUBLE_FORMAT "0www"
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# else
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# if REAL_WIDTH == 4
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# define CONST_DOUBLE_FORMAT "0wwww"
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# else
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# if REAL_WIDTH == 5
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# define CONST_DOUBLE_FORMAT "0wwwww"
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# else
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# define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
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# endif
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# endif
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# endif
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# endif
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#endif
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/* Indexed by rtx code, gives number of operands for an rtx with that code.
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Does NOT include rtx header data (code and links). */
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) sizeof FORMAT - 1 ,
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const unsigned char rtx_length[NUM_RTX_CODE] = {
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#include "rtl.def"
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};
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#undef DEF_RTL_EXPR
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/* Indexed by rtx code, gives the name of that kind of rtx, as a C string. */
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) NAME ,
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const char * const rtx_name[NUM_RTX_CODE] = {
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#include "rtl.def" /* rtl expressions are documented here */
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};
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#undef DEF_RTL_EXPR
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/* Indexed by machine mode, gives the name of that machine mode.
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This name does not include the letters "mode". */
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#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) NAME,
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const char * const mode_name[NUM_MACHINE_MODES] = {
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#include "machmode.def"
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};
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#undef DEF_MACHMODE
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/* Indexed by machine mode, gives the class mode for GET_MODE_CLASS. */
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#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) CLASS,
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const enum mode_class mode_class[NUM_MACHINE_MODES] = {
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#include "machmode.def"
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};
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#undef DEF_MACHMODE
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/* Indexed by machine mode, gives the length of the mode, in bits.
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GET_MODE_BITSIZE uses this. */
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#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) BITSIZE,
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const unsigned short mode_bitsize[NUM_MACHINE_MODES] = {
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#include "machmode.def"
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};
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#undef DEF_MACHMODE
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/* Indexed by machine mode, gives the length of the mode, in bytes.
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GET_MODE_SIZE uses this. */
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#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) SIZE,
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const unsigned char mode_size[NUM_MACHINE_MODES] = {
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#include "machmode.def"
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};
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#undef DEF_MACHMODE
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/* Indexed by machine mode, gives the length of the mode's subunit.
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GET_MODE_UNIT_SIZE uses this. */
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#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) UNIT,
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const unsigned char mode_unit_size[NUM_MACHINE_MODES] = {
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#include "machmode.def" /* machine modes are documented here */
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};
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#undef DEF_MACHMODE
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/* Indexed by machine mode, gives next wider natural mode
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(QI -> HI -> SI -> DI, etc.) Widening multiply instructions
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use this. */
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#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) \
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(unsigned char) WIDER,
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const unsigned char mode_wider_mode[NUM_MACHINE_MODES] = {
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#include "machmode.def" /* machine modes are documented here */
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};
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#undef DEF_MACHMODE
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#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) \
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((BITSIZE) >= HOST_BITS_PER_WIDE_INT) ? ~(unsigned HOST_WIDE_INT) 0 : ((unsigned HOST_WIDE_INT) 1 << (BITSIZE)) - 1,
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/* Indexed by machine mode, gives mask of significant bits in mode. */
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const unsigned HOST_WIDE_INT mode_mask_array[NUM_MACHINE_MODES] = {
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#include "machmode.def"
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};
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#undef DEF_MACHMODE
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#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER, INNER) INNER,
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/* Indexed by machine mode, gives the mode of the inner elements in a
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vector type. */
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const enum machine_mode inner_mode_array[NUM_MACHINE_MODES] = {
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#include "machmode.def"
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};
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/* Indexed by mode class, gives the narrowest mode for each class.
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The Q modes are always of width 1 (2 for complex) - it is impossible
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for any mode to be narrower.
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Note that we use QImode instead of BImode for MODE_INT, since
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otherwise the middle end will try to use it for bitfields in
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structures and the like, which we do not want. Only the target
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md file should generate BImode widgets. */
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const enum machine_mode class_narrowest_mode[(int) MAX_MODE_CLASS] = {
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/* MODE_RANDOM */ VOIDmode,
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/* MODE_INT */ QImode,
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/* MODE_FLOAT */ QFmode,
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/* MODE_PARTIAL_INT */ PQImode,
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/* MODE_CC */ CCmode,
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/* MODE_COMPLEX_INT */ CQImode,
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/* MODE_COMPLEX_FLOAT */ QCmode,
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/* MODE_VECTOR_INT */ V2QImode,
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/* MODE_VECTOR_FLOAT */ V2SFmode
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};
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/* Indexed by rtx code, gives a sequence of operand-types for
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rtx's of that code. The sequence is a C string in which
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each character describes one operand. */
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const char * const rtx_format[NUM_RTX_CODE] = {
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/* "*" undefined.
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can cause a warning message
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"0" field is unused (or used in a phase-dependent manner)
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prints nothing
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"i" an integer
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prints the integer
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"n" like "i", but prints entries from `note_insn_name'
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"w" an integer of width HOST_BITS_PER_WIDE_INT
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prints the integer
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"s" a pointer to a string
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prints the string
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"S" like "s", but optional:
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the containing rtx may end before this operand
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"T" like "s", but treated specially by the RTL reader;
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only found in machine description patterns.
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"e" a pointer to an rtl expression
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prints the expression
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"E" a pointer to a vector that points to a number of rtl expressions
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prints a list of the rtl expressions
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"V" like "E", but optional:
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the containing rtx may end before this operand
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"u" a pointer to another insn
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prints the uid of the insn.
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"b" is a pointer to a bitmap header.
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"t" is a tree pointer. */
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) FORMAT ,
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#include "rtl.def" /* rtl expressions are defined here */
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#undef DEF_RTL_EXPR
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};
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/* Indexed by rtx code, gives a character representing the "class" of
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that rtx code. See rtl.def for documentation on the defined classes. */
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const char rtx_class[NUM_RTX_CODE] = {
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) CLASS,
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#include "rtl.def" /* rtl expressions are defined here */
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#undef DEF_RTL_EXPR
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};
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/* Names for kinds of NOTEs and REG_NOTEs. */
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const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS] =
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{
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"", "NOTE_INSN_DELETED",
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"NOTE_INSN_BLOCK_BEG", "NOTE_INSN_BLOCK_END",
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"NOTE_INSN_LOOP_BEG", "NOTE_INSN_LOOP_END",
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"NOTE_INSN_LOOP_CONT", "NOTE_INSN_LOOP_VTOP",
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"NOTE_INSN_LOOP_END_TOP_COND", "NOTE_INSN_FUNCTION_END",
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"NOTE_INSN_PROLOGUE_END", "NOTE_INSN_EPILOGUE_BEG",
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"NOTE_INSN_DELETED_LABEL", "NOTE_INSN_FUNCTION_BEG",
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"NOTE_INSN_EH_REGION_BEG", "NOTE_INSN_EH_REGION_END",
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"NOTE_INSN_REPEATED_LINE_NUMBER", "NOTE_INSN_RANGE_BEG",
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"NOTE_INSN_RANGE_END", "NOTE_INSN_LIVE",
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"NOTE_INSN_BASIC_BLOCK", "NOTE_INSN_EXPECTED_VALUE"
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};
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const char * const reg_note_name[] =
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{
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"", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_EQUAL",
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"REG_WAS_0", "REG_RETVAL", "REG_LIBCALL", "REG_NONNEG",
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"REG_NO_CONFLICT", "REG_UNUSED", "REG_CC_SETTER", "REG_CC_USER",
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"REG_LABEL", "REG_DEP_ANTI", "REG_DEP_OUTPUT", "REG_BR_PROB",
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"REG_EXEC_COUNT", "REG_NOALIAS", "REG_SAVE_AREA", "REG_BR_PRED",
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"REG_FRAME_RELATED_EXPR", "REG_EH_CONTEXT", "REG_EH_REGION",
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"REG_SAVE_NOTE", "REG_MAYBE_DEAD", "REG_NORETURN",
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"REG_NON_LOCAL_GOTO", "REG_SETJMP", "REG_ALWAYS_RETURN",
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"REG_VTABLE_REF"
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};
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/* Allocate an rtx vector of N elements.
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Store the length, and initialize all elements to zero. */
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rtvec
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rtvec_alloc (n)
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int n;
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{
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rtvec rt;
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rt = ggc_alloc_rtvec (n);
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/* clear out the vector */
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memset (&rt->elem[0], 0, n * sizeof (rtx));
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PUT_NUM_ELEM (rt, n);
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return rt;
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}
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/* Allocate an rtx of code CODE. The CODE is stored in the rtx;
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all the rest is initialized to zero. */
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rtx
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rtx_alloc (code)
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RTX_CODE code;
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{
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rtx rt;
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int n = GET_RTX_LENGTH (code);
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rt = ggc_alloc_rtx (n);
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/* We want to clear everything up to the FLD array. Normally, this
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is one int, but we don't want to assume that and it isn't very
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portable anyway; this is. */
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memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));
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PUT_CODE (rt, code);
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return rt;
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}
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/* Create a new copy of an rtx.
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Recursively copies the operands of the rtx,
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except for those few rtx codes that are sharable. */
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rtx
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copy_rtx (orig)
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rtx orig;
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{
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rtx copy;
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int i, j;
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RTX_CODE code;
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const char *format_ptr;
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code = GET_CODE (orig);
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switch (code)
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{
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case REG:
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case QUEUED:
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case CONST_INT:
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case CONST_DOUBLE:
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case CONST_VECTOR:
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case SYMBOL_REF:
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case CODE_LABEL:
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case PC:
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case CC0:
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case SCRATCH:
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/* SCRATCH must be shared because they represent distinct values. */
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case ADDRESSOF:
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return orig;
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case CONST:
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/* CONST can be shared if it contains a SYMBOL_REF. If it contains
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a LABEL_REF, it isn't sharable. */
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if (GET_CODE (XEXP (orig, 0)) == PLUS
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&& GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF
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&& GET_CODE (XEXP (XEXP (orig, 0), 1)) == CONST_INT)
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return orig;
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break;
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/* A MEM with a constant address is not sharable. The problem is that
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the constant address may need to be reloaded. If the mem is shared,
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then reloading one copy of this mem will cause all copies to appear
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to have been reloaded. */
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default:
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break;
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}
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copy = rtx_alloc (code);
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/* Copy the various flags, and other information. We assume that
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all fields need copying, and then clear the fields that should
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not be copied. That is the sensible default behavior, and forces
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us to explicitly document why we are *not* copying a flag. */
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memcpy (copy, orig, sizeof (struct rtx_def) - sizeof (rtunion));
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/* We do not copy the USED flag, which is used as a mark bit during
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walks over the RTL. */
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copy->used = 0;
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/* We do not copy FRAME_RELATED for INSNs. */
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if (GET_RTX_CLASS (code) == 'i')
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copy->frame_related = 0;
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copy->jump = orig->jump;
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copy->call = orig->call;
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format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
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for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
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{
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copy->fld[i] = orig->fld[i];
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switch (*format_ptr++)
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{
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case 'e':
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if (XEXP (orig, i) != NULL)
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XEXP (copy, i) = copy_rtx (XEXP (orig, i));
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break;
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case 'E':
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case 'V':
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if (XVEC (orig, i) != NULL)
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{
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XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
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for (j = 0; j < XVECLEN (copy, i); j++)
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XVECEXP (copy, i, j) = copy_rtx (XVECEXP (orig, i, j));
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}
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break;
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case 't':
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case 'w':
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case 'i':
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case 's':
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case 'S':
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case 'T':
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case 'u':
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case '0':
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/* These are left unchanged. */
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break;
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default:
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abort ();
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}
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}
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return copy;
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}
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/* Create a new copy of an rtx. Only copy just one level. */
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rtx
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shallow_copy_rtx (orig)
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rtx orig;
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{
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int i;
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RTX_CODE code = GET_CODE (orig);
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rtx copy = rtx_alloc (code);
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PUT_MODE (copy, GET_MODE (orig));
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copy->in_struct = orig->in_struct;
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copy->volatil = orig->volatil;
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copy->unchanging = orig->unchanging;
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copy->integrated = orig->integrated;
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copy->frame_related = orig->frame_related;
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for (i = 0; i < GET_RTX_LENGTH (code); i++)
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copy->fld[i] = orig->fld[i];
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return copy;
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}
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/* Return the alignment of MODE. This will be bounded by 1 and
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BIGGEST_ALIGNMENT. */
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unsigned int
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get_mode_alignment (mode)
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enum machine_mode mode;
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{
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unsigned int alignment;
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if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT
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|| GET_MODE_CLASS (mode) == MODE_COMPLEX_INT)
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alignment = GET_MODE_UNIT_SIZE (mode);
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else
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alignment = GET_MODE_SIZE (mode);
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/* Extract the LSB of the size. */
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alignment = alignment & -alignment;
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alignment *= BITS_PER_UNIT;
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alignment = MIN (BIGGEST_ALIGNMENT, MAX (1, alignment));
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return alignment;
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}
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/* This is 1 until after the rtl generation pass. */
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int rtx_equal_function_value_matters;
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/* Nonzero when we are generating CONCATs. */
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int generating_concat_p;
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/* Return 1 if X and Y are identical-looking rtx's.
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This is the Lisp function EQUAL for rtx arguments. */
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int
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rtx_equal_p (x, y)
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rtx x, y;
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{
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int i;
|
||
int j;
|
||
enum rtx_code code;
|
||
const char *fmt;
|
||
|
||
if (x == y)
|
||
return 1;
|
||
if (x == 0 || y == 0)
|
||
return 0;
|
||
|
||
code = GET_CODE (x);
|
||
/* Rtx's of different codes cannot be equal. */
|
||
if (code != GET_CODE (y))
|
||
return 0;
|
||
|
||
/* (MULT:SI x y) and (MULT:HI x y) are NOT equivalent.
|
||
(REG:SI x) and (REG:HI x) are NOT equivalent. */
|
||
|
||
if (GET_MODE (x) != GET_MODE (y))
|
||
return 0;
|
||
|
||
/* Some RTL can be compared nonrecursively. */
|
||
switch (code)
|
||
{
|
||
case REG:
|
||
/* Until rtl generation is complete, don't consider a reference
|
||
to the return register of the current function the same as
|
||
the return from a called function. This eases the job of
|
||
function integration. Once the distinction is no longer
|
||
needed, they can be considered equivalent. */
|
||
return (REGNO (x) == REGNO (y)
|
||
&& (! rtx_equal_function_value_matters
|
||
|| REG_FUNCTION_VALUE_P (x) == REG_FUNCTION_VALUE_P (y)));
|
||
|
||
case LABEL_REF:
|
||
return XEXP (x, 0) == XEXP (y, 0);
|
||
|
||
case SYMBOL_REF:
|
||
return XSTR (x, 0) == XSTR (y, 0);
|
||
|
||
case SCRATCH:
|
||
case CONST_DOUBLE:
|
||
case CONST_INT:
|
||
case CONST_VECTOR:
|
||
return 0;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
/* Compare the elements. If any pair of corresponding elements
|
||
fail to match, return 0 for the whole things. */
|
||
|
||
fmt = GET_RTX_FORMAT (code);
|
||
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
|
||
{
|
||
switch (fmt[i])
|
||
{
|
||
case 'w':
|
||
if (XWINT (x, i) != XWINT (y, i))
|
||
return 0;
|
||
break;
|
||
|
||
case 'n':
|
||
case 'i':
|
||
if (XINT (x, i) != XINT (y, i))
|
||
return 0;
|
||
break;
|
||
|
||
case 'V':
|
||
case 'E':
|
||
/* Two vectors must have the same length. */
|
||
if (XVECLEN (x, i) != XVECLEN (y, i))
|
||
return 0;
|
||
|
||
/* And the corresponding elements must match. */
|
||
for (j = 0; j < XVECLEN (x, i); j++)
|
||
if (rtx_equal_p (XVECEXP (x, i, j), XVECEXP (y, i, j)) == 0)
|
||
return 0;
|
||
break;
|
||
|
||
case 'e':
|
||
if (rtx_equal_p (XEXP (x, i), XEXP (y, i)) == 0)
|
||
return 0;
|
||
break;
|
||
|
||
case 'S':
|
||
case 's':
|
||
if ((XSTR (x, i) || XSTR (y, i))
|
||
&& (! XSTR (x, i) || ! XSTR (y, i)
|
||
|| strcmp (XSTR (x, i), XSTR (y, i))))
|
||
return 0;
|
||
break;
|
||
|
||
case 'u':
|
||
/* These are just backpointers, so they don't matter. */
|
||
break;
|
||
|
||
case '0':
|
||
case 't':
|
||
break;
|
||
|
||
/* It is believed that rtx's at this level will never
|
||
contain anything but integers and other rtx's,
|
||
except for within LABEL_REFs and SYMBOL_REFs. */
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
#if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
|
||
void
|
||
rtl_check_failed_bounds (r, n, file, line, func)
|
||
rtx r;
|
||
int n;
|
||
const char *file;
|
||
int line;
|
||
const char *func;
|
||
{
|
||
internal_error
|
||
("RTL check: access of elt %d of `%s' with last elt %d in %s, at %s:%d",
|
||
n, GET_RTX_NAME (GET_CODE (r)), GET_RTX_LENGTH (GET_CODE (r)) - 1,
|
||
func, trim_filename (file), line);
|
||
}
|
||
|
||
void
|
||
rtl_check_failed_type1 (r, n, c1, file, line, func)
|
||
rtx r;
|
||
int n;
|
||
int c1;
|
||
const char *file;
|
||
int line;
|
||
const char *func;
|
||
{
|
||
internal_error
|
||
("RTL check: expected elt %d type '%c', have '%c' (rtx %s) in %s, at %s:%d",
|
||
n, c1, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
|
||
func, trim_filename (file), line);
|
||
}
|
||
|
||
void
|
||
rtl_check_failed_type2 (r, n, c1, c2, file, line, func)
|
||
rtx r;
|
||
int n;
|
||
int c1;
|
||
int c2;
|
||
const char *file;
|
||
int line;
|
||
const char *func;
|
||
{
|
||
internal_error
|
||
("RTL check: expected elt %d type '%c' or '%c', have '%c' (rtx %s) in %s, at %s:%d",
|
||
n, c1, c2, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
|
||
func, trim_filename (file), line);
|
||
}
|
||
|
||
void
|
||
rtl_check_failed_code1 (r, code, file, line, func)
|
||
rtx r;
|
||
enum rtx_code code;
|
||
const char *file;
|
||
int line;
|
||
const char *func;
|
||
{
|
||
internal_error ("RTL check: expected code `%s', have `%s' in %s, at %s:%d",
|
||
GET_RTX_NAME (code), GET_RTX_NAME (GET_CODE (r)), func,
|
||
trim_filename (file), line);
|
||
}
|
||
|
||
void
|
||
rtl_check_failed_code2 (r, code1, code2, file, line, func)
|
||
rtx r;
|
||
enum rtx_code code1, code2;
|
||
const char *file;
|
||
int line;
|
||
const char *func;
|
||
{
|
||
internal_error
|
||
("RTL check: expected code `%s' or `%s', have `%s' in %s, at %s:%d",
|
||
GET_RTX_NAME (code1), GET_RTX_NAME (code2), GET_RTX_NAME (GET_CODE (r)),
|
||
func, trim_filename (file), line);
|
||
}
|
||
|
||
/* XXX Maybe print the vector? */
|
||
void
|
||
rtvec_check_failed_bounds (r, n, file, line, func)
|
||
rtvec r;
|
||
int n;
|
||
const char *file;
|
||
int line;
|
||
const char *func;
|
||
{
|
||
internal_error
|
||
("RTL check: access of elt %d of vector with last elt %d in %s, at %s:%d",
|
||
n, GET_NUM_ELEM (r) - 1, func, trim_filename (file), line);
|
||
}
|
||
#endif /* ENABLE_RTL_CHECKING */
|