a4cd5630b0
non-i386, non-unix, and generatable files have been trimmed, but can easily be added in later if needed. gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's handy to have both available for reference for such little cost. The freebsd-specific changes will then be committed, and once the dust has settled, the bmakefiles will be committed to use this code.
855 lines
31 KiB
C
855 lines
31 KiB
C
/* Definitions for code generation pass of GNU compiler.
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Copyright (C) 1987, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef __STDC__
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#ifndef const
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#define const
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#endif
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#endif
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/* The default branch cost is 1. */
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#ifndef BRANCH_COST
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#define BRANCH_COST 1
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#endif
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/* Macros to access the slots of a QUEUED rtx.
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Here rather than in rtl.h because only the expansion pass
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should ever encounter a QUEUED. */
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/* The variable for which an increment is queued. */
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#define QUEUED_VAR(P) XEXP (P, 0)
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/* If the increment has been emitted, this is the insn
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that does the increment. It is zero before the increment is emitted. */
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#define QUEUED_INSN(P) XEXP (P, 1)
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/* If a pre-increment copy has been generated, this is the copy
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(it is a temporary reg). Zero if no copy made yet. */
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#define QUEUED_COPY(P) XEXP (P, 2)
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/* This is the body to use for the insn to do the increment.
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It is used to emit the increment. */
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#define QUEUED_BODY(P) XEXP (P, 3)
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/* Next QUEUED in the queue. */
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#define QUEUED_NEXT(P) XEXP (P, 4)
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/* This is the 4th arg to `expand_expr'.
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EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
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EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
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EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
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is a constant that is not a legitimate address. */
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enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
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EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER};
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/* List of labels that must never be deleted. */
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extern rtx forced_labels;
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/* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
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So we can mark them all live at the end of the function, if stupid. */
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extern rtx save_expr_regs;
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extern int current_function_calls_alloca;
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extern int current_function_outgoing_args_size;
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/* This is the offset from the arg pointer to the place where the first
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anonymous arg can be found, if there is one. */
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extern rtx current_function_arg_offset_rtx;
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/* This is nonzero if the current function uses the constant pool. */
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extern int current_function_uses_const_pool;
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/* This is nonzero if the current function uses pic_offset_table_rtx. */
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extern int current_function_uses_pic_offset_table;
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/* The arg pointer hard register, or the pseudo into which it was copied. */
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extern rtx current_function_internal_arg_pointer;
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/* Nonzero means stack pops must not be deferred, and deferred stack
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pops must not be output. It is nonzero inside a function call,
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inside a conditional expression, inside a statement expression,
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and in other cases as well. */
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extern int inhibit_defer_pop;
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/* Number of function calls seen so far in current function. */
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extern int function_call_count;
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/* RTX for stack slot that holds the current handler for nonlocal gotos.
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Zero when function does not have nonlocal labels. */
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extern rtx nonlocal_goto_handler_slot;
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/* RTX for stack slot that holds the stack pointer value to restore
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for a nonlocal goto.
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Zero when function does not have nonlocal labels. */
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extern rtx nonlocal_goto_stack_level;
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/* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
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(labels to which there can be nonlocal gotos from nested functions)
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in this function. */
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#ifdef TREE_CODE /* Don't lose if tree.h not included. */
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extern tree nonlocal_labels;
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#endif
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#define NO_DEFER_POP (inhibit_defer_pop += 1)
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#define OK_DEFER_POP (inhibit_defer_pop -= 1)
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/* Number of units that we should eventually pop off the stack.
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These are the arguments to function calls that have already returned. */
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extern int pending_stack_adjust;
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/* A list of all cleanups which belong to the arguments of
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function calls being expanded by expand_call. */
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#ifdef TREE_CODE /* Don't lose if tree.h not included. */
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extern tree cleanups_this_call;
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#endif
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/* When temporaries are created by TARGET_EXPRs, they are created at
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this level of temp_slot_level, so that they can remain allocated
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until no longer needed. CLEANUP_POINT_EXPRs define the lifetime
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of TARGET_EXPRs. */
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extern int target_temp_slot_level;
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#ifdef TREE_CODE /* Don't lose if tree.h not included. */
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/* Structure to record the size of a sequence of arguments
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as the sum of a tree-expression and a constant. */
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struct args_size
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{
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int constant;
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tree var;
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};
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#endif
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/* Add the value of the tree INC to the `struct args_size' TO. */
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#define ADD_PARM_SIZE(TO, INC) \
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{ tree inc = (INC); \
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if (TREE_CODE (inc) == INTEGER_CST) \
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(TO).constant += TREE_INT_CST_LOW (inc); \
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else if ((TO).var == 0) \
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(TO).var = inc; \
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else \
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(TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
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#define SUB_PARM_SIZE(TO, DEC) \
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{ tree dec = (DEC); \
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if (TREE_CODE (dec) == INTEGER_CST) \
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(TO).constant -= TREE_INT_CST_LOW (dec); \
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else if ((TO).var == 0) \
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(TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
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else \
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(TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
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/* Convert the implicit sum in a `struct args_size' into an rtx. */
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#define ARGS_SIZE_RTX(SIZE) \
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((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
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: expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
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size_int ((SIZE).constant)), \
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NULL_RTX, VOIDmode, 0))
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/* Convert the implicit sum in a `struct args_size' into a tree. */
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#define ARGS_SIZE_TREE(SIZE) \
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((SIZE).var == 0 ? size_int ((SIZE).constant) \
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: size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
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/* Supply a default definition for FUNCTION_ARG_PADDING:
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usually pad upward, but pad short args downward on
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big-endian machines. */
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enum direction {none, upward, downward}; /* Value has this type. */
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#ifndef FUNCTION_ARG_PADDING
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#define FUNCTION_ARG_PADDING(MODE, TYPE) \
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(! BYTES_BIG_ENDIAN \
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? upward \
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: (((MODE) == BLKmode \
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? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
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&& int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
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: GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
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? downward : upward))
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#endif
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/* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
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FUNCTION_ARG_PADDING, which also pads the length, handle any needed
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alignment. */
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#ifndef FUNCTION_ARG_BOUNDARY
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#define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
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#endif
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/* Nonzero if we do not know how to pass TYPE solely in registers.
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We cannot do so in the following cases:
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- if the type has variable size
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- if the type is marked as addressable (it is required to be constructed
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into the stack)
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- if the padding and mode of the type is such that a copy into a register
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would put it into the wrong part of the register.
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Which padding can't be supported depends on the byte endianness.
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A value in a register is implicitly padded at the most significant end.
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On a big-endian machine, that is the lower end in memory.
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So a value padded in memory at the upper end can't go in a register.
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For a little-endian machine, the reverse is true. */
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#define MUST_PASS_IN_STACK(MODE,TYPE) \
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((TYPE) != 0 \
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&& (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
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|| TREE_ADDRESSABLE (TYPE) \
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|| ((MODE) == BLKmode \
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&& ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
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&& 0 == (int_size_in_bytes (TYPE) \
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% (PARM_BOUNDARY / BITS_PER_UNIT))) \
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&& (FUNCTION_ARG_PADDING (MODE, TYPE) \
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== (BYTES_BIG_ENDIAN ? upward : downward)))))
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/* Nonzero if type TYPE should be returned in memory.
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Most machines can use the following default definition. */
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#ifndef RETURN_IN_MEMORY
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#define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
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#endif
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/* Optabs are tables saying how to generate insn bodies
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for various machine modes and numbers of operands.
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Each optab applies to one operation.
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For example, add_optab applies to addition.
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The insn_code slot is the enum insn_code that says how to
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generate an insn for this operation on a particular machine mode.
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It is CODE_FOR_nothing if there is no such insn on the target machine.
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The `lib_call' slot is the name of the library function that
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can be used to perform the operation.
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A few optabs, such as move_optab and cmp_optab, are used
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by special code. */
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/* Everything that uses expr.h needs to define enum insn_code
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but we don't list it in the Makefile dependencies just for that. */
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#include "insn-codes.h"
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typedef struct optab
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{
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enum rtx_code code;
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struct {
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enum insn_code insn_code;
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rtx libfunc;
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} handlers [NUM_MACHINE_MODES];
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} * optab;
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/* Given an enum insn_code, access the function to construct
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the body of that kind of insn. */
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#ifdef FUNCTION_CONVERSION_BUG
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/* Some compilers fail to convert a function properly to a
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pointer-to-function when used as an argument.
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So produce the pointer-to-function directly.
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Luckily, these compilers seem to work properly when you
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call the pointer-to-function. */
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#define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
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#else
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#define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
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#endif
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extern rtx (*const insn_gen_function[]) ();
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extern optab add_optab;
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extern optab sub_optab;
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extern optab smul_optab; /* Signed and floating-point multiply */
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extern optab smul_highpart_optab; /* Signed multiply, return high word */
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extern optab umul_highpart_optab;
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extern optab smul_widen_optab; /* Signed multiply with result
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one machine mode wider than args */
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extern optab umul_widen_optab;
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extern optab sdiv_optab; /* Signed divide */
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extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
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extern optab udiv_optab;
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extern optab udivmod_optab;
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extern optab smod_optab; /* Signed remainder */
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extern optab umod_optab;
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extern optab flodiv_optab; /* Optab for floating divide. */
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extern optab ftrunc_optab; /* Convert float to integer in float fmt */
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extern optab and_optab; /* Logical and */
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extern optab ior_optab; /* Logical or */
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extern optab xor_optab; /* Logical xor */
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extern optab ashl_optab; /* Arithmetic shift left */
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extern optab ashr_optab; /* Arithmetic shift right */
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extern optab lshr_optab; /* Logical shift right */
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extern optab rotl_optab; /* Rotate left */
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extern optab rotr_optab; /* Rotate right */
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extern optab smin_optab; /* Signed and floating-point minimum value */
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extern optab smax_optab; /* Signed and floating-point maximum value */
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extern optab umin_optab; /* Unsigned minimum value */
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extern optab umax_optab; /* Unsigned maximum value */
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extern optab mov_optab; /* Move instruction. */
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extern optab movstrict_optab; /* Move, preserving high part of register. */
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extern optab cmp_optab; /* Compare insn; two operands. */
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extern optab tst_optab; /* tst insn; compare one operand against 0 */
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/* Unary operations */
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extern optab neg_optab; /* Negation */
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extern optab abs_optab; /* Abs value */
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extern optab one_cmpl_optab; /* Bitwise not */
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extern optab ffs_optab; /* Find first bit set */
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extern optab sqrt_optab; /* Square root */
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extern optab sin_optab; /* Sine */
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extern optab cos_optab; /* Cosine */
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extern optab strlen_optab; /* String length */
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/* Tables of patterns for extending one integer mode to another. */
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extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
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/* Tables of patterns for converting between fixed and floating point. */
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extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
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extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
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extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
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/* Contains the optab used for each rtx code. */
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extern optab code_to_optab[NUM_RTX_CODE + 1];
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/* Passed to expand_binop and expand_unop to say which options to try to use
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if the requested operation can't be open-coded on the requisite mode.
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Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
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Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
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OPTAB_MUST_WIDEN says try widening and don't try anything else. */
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enum optab_methods
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{
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OPTAB_DIRECT,
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OPTAB_LIB,
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OPTAB_WIDEN,
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OPTAB_LIB_WIDEN,
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OPTAB_MUST_WIDEN
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};
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/* SYMBOL_REF rtx's for the library functions that are called
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implicitly and not via optabs. */
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extern rtx extendsfdf2_libfunc;
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extern rtx extendsfxf2_libfunc;
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extern rtx extendsftf2_libfunc;
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extern rtx extenddfxf2_libfunc;
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extern rtx extenddftf2_libfunc;
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extern rtx truncdfsf2_libfunc;
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extern rtx truncxfsf2_libfunc;
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extern rtx trunctfsf2_libfunc;
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extern rtx truncxfdf2_libfunc;
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extern rtx trunctfdf2_libfunc;
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extern rtx memcpy_libfunc;
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extern rtx bcopy_libfunc;
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extern rtx memcmp_libfunc;
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extern rtx bcmp_libfunc;
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extern rtx memset_libfunc;
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extern rtx bzero_libfunc;
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extern rtx eqhf2_libfunc;
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extern rtx nehf2_libfunc;
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extern rtx gthf2_libfunc;
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extern rtx gehf2_libfunc;
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extern rtx lthf2_libfunc;
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extern rtx lehf2_libfunc;
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extern rtx eqsf2_libfunc;
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extern rtx nesf2_libfunc;
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extern rtx gtsf2_libfunc;
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extern rtx gesf2_libfunc;
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extern rtx ltsf2_libfunc;
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extern rtx lesf2_libfunc;
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extern rtx eqdf2_libfunc;
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extern rtx nedf2_libfunc;
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extern rtx gtdf2_libfunc;
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extern rtx gedf2_libfunc;
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extern rtx ltdf2_libfunc;
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extern rtx ledf2_libfunc;
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extern rtx eqxf2_libfunc;
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extern rtx nexf2_libfunc;
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extern rtx gtxf2_libfunc;
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extern rtx gexf2_libfunc;
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extern rtx ltxf2_libfunc;
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extern rtx lexf2_libfunc;
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extern rtx eqtf2_libfunc;
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extern rtx netf2_libfunc;
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extern rtx gttf2_libfunc;
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extern rtx getf2_libfunc;
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extern rtx lttf2_libfunc;
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extern rtx letf2_libfunc;
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extern rtx floatsisf_libfunc;
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extern rtx floatdisf_libfunc;
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extern rtx floattisf_libfunc;
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extern rtx floatsidf_libfunc;
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extern rtx floatdidf_libfunc;
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extern rtx floattidf_libfunc;
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extern rtx floatsixf_libfunc;
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extern rtx floatdixf_libfunc;
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extern rtx floattixf_libfunc;
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extern rtx floatsitf_libfunc;
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extern rtx floatditf_libfunc;
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extern rtx floattitf_libfunc;
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extern rtx fixsfsi_libfunc;
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extern rtx fixsfdi_libfunc;
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extern rtx fixsfti_libfunc;
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extern rtx fixdfsi_libfunc;
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extern rtx fixdfdi_libfunc;
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extern rtx fixdfti_libfunc;
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extern rtx fixxfsi_libfunc;
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extern rtx fixxfdi_libfunc;
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extern rtx fixxfti_libfunc;
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extern rtx fixtfsi_libfunc;
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extern rtx fixtfdi_libfunc;
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extern rtx fixtfti_libfunc;
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extern rtx fixunssfsi_libfunc;
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extern rtx fixunssfdi_libfunc;
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extern rtx fixunssfti_libfunc;
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extern rtx fixunsdfsi_libfunc;
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extern rtx fixunsdfdi_libfunc;
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extern rtx fixunsdfti_libfunc;
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extern rtx fixunsxfsi_libfunc;
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extern rtx fixunsxfdi_libfunc;
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extern rtx fixunsxfti_libfunc;
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extern rtx fixunstfsi_libfunc;
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extern rtx fixunstfdi_libfunc;
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extern rtx fixunstfti_libfunc;
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typedef rtx (*rtxfun) ();
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/* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
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gives the gen_function to make a branch to test that condition. */
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extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
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/* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
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gives the insn code to make a store-condition insn
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to test that condition. */
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||
|
||
extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
|
||
|
||
#ifdef HAVE_conditional_move
|
||
/* Indexed by the the machine mode, gives the insn code to make a conditional
|
||
move insn. */
|
||
|
||
extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
|
||
#endif
|
||
|
||
/* This array records the insn_code of insns to perform block moves. */
|
||
extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
|
||
|
||
/* Define functions given in optabs.c. */
|
||
|
||
/* Expand a binary operation given optab and rtx operands. */
|
||
extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
|
||
int, enum optab_methods));
|
||
|
||
/* Expand a binary operation with both signed and unsigned forms. */
|
||
extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
|
||
rtx, rtx, int, enum optab_methods));
|
||
|
||
/* Generate code to perform an operation on two operands with two results. */
|
||
extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
|
||
|
||
/* Expand a unary arithmetic operation given optab rtx operand. */
|
||
extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
|
||
|
||
/* Expand the absolute value operation. */
|
||
extern rtx expand_abs PROTO((enum machine_mode, rtx, rtx, int, int));
|
||
|
||
/* Expand the complex absolute value operation. */
|
||
extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
|
||
|
||
/* Generate an instruction with a given INSN_CODE with an output and
|
||
an input. */
|
||
extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
|
||
|
||
/* Emit code to perform a series of operations on a multi-word quantity, one
|
||
word at a time. */
|
||
extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
|
||
|
||
/* Emit code to make a call to a constant function or a library call. */
|
||
extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
|
||
|
||
/* Emit one rtl instruction to store zero in specified rtx. */
|
||
extern void emit_clr_insn PROTO((rtx));
|
||
|
||
/* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
|
||
extern void emit_0_to_1_insn PROTO((rtx));
|
||
|
||
/* Emit one rtl insn to compare two rtx's. */
|
||
extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
|
||
enum machine_mode, int, int));
|
||
|
||
/* Nonzero if a compare of mode MODE can be done straightforwardly
|
||
(without splitting it into pieces). */
|
||
extern int can_compare_p PROTO((enum machine_mode));
|
||
|
||
/* Emit a library call comparison between floating point X and Y.
|
||
COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */
|
||
extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
|
||
|
||
/* Generate code to indirectly jump to a location given in the rtx LOC. */
|
||
extern void emit_indirect_jump PROTO((rtx));
|
||
|
||
#ifdef HAVE_conditional_move
|
||
/* Emit a conditional move operation. */
|
||
rtx emit_conditional_move PROTO((rtx, enum rtx_code, rtx, rtx,
|
||
enum machine_mode, rtx, rtx,
|
||
enum machine_mode, int));
|
||
|
||
/* Return non-zero if the conditional move is supported. */
|
||
int can_conditionally_move_p PROTO((enum machine_mode mode));
|
||
#endif
|
||
|
||
/* Create but don't emit one rtl instruction to add one rtx into another.
|
||
Modes must match; operands must meet the operation's predicates.
|
||
Likewise for subtraction and for just copying.
|
||
These do not call protect_from_queue; caller must do so. */
|
||
extern rtx gen_add2_insn PROTO((rtx, rtx));
|
||
extern rtx gen_sub2_insn PROTO((rtx, rtx));
|
||
extern rtx gen_move_insn PROTO((rtx, rtx));
|
||
extern int have_add2_insn PROTO((enum machine_mode));
|
||
extern int have_sub2_insn PROTO((enum machine_mode));
|
||
|
||
/* Return the INSN_CODE to use for an extend operation. */
|
||
extern enum insn_code can_extend_p PROTO((enum machine_mode,
|
||
enum machine_mode, int));
|
||
|
||
/* Generate the body of an insn to extend Y (with mode MFROM)
|
||
into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */
|
||
extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
|
||
enum machine_mode, int));
|
||
|
||
/* Initialize the tables that control conversion between fixed and
|
||
floating values. */
|
||
extern void init_fixtab PROTO((void));
|
||
extern void init_floattab PROTO((void));
|
||
|
||
/* Generate code for a FLOAT_EXPR. */
|
||
extern void expand_float PROTO((rtx, rtx, int));
|
||
|
||
/* Generate code for a FIX_EXPR. */
|
||
extern void expand_fix PROTO((rtx, rtx, int));
|
||
|
||
/* Call this once to initialize the contents of the optabs
|
||
appropriately for the current target machine. */
|
||
extern void init_optabs PROTO((void));
|
||
|
||
/* Functions from expmed.c: */
|
||
|
||
/* Arguments MODE, RTX: return an rtx for the negation of that value.
|
||
May emit insns. */
|
||
extern rtx negate_rtx PROTO((enum machine_mode, rtx));
|
||
|
||
/* Expand a logical AND operation. */
|
||
extern rtx expand_and PROTO((rtx, rtx, rtx));
|
||
|
||
/* Emit a store-flag operation. */
|
||
extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
|
||
enum machine_mode, int, int));
|
||
|
||
/* Functions from loop.c: */
|
||
|
||
/* Given a JUMP_INSN, return a description of the test being made. */
|
||
extern rtx get_condition PROTO((rtx, rtx *));
|
||
|
||
/* Functions from expr.c: */
|
||
|
||
/* This is run once per compilation to set up which modes can be used
|
||
directly in memory and to initialize the block move optab. */
|
||
extern void init_expr_once PROTO((void));
|
||
|
||
/* This is run at the start of compiling a function. */
|
||
extern void init_expr PROTO((void));
|
||
|
||
/* Use protect_from_queue to convert a QUEUED expression
|
||
into something that you can put immediately into an instruction. */
|
||
extern rtx protect_from_queue PROTO((rtx, int));
|
||
|
||
/* Perform all the pending incrementations. */
|
||
extern void emit_queue PROTO((void));
|
||
|
||
/* Emit some rtl insns to move data between rtx's, converting machine modes.
|
||
Both modes must be floating or both fixed. */
|
||
extern void convert_move PROTO((rtx, rtx, int));
|
||
|
||
/* Convert an rtx to specified machine mode and return the result. */
|
||
extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
|
||
|
||
/* Convert an rtx to MODE from OLDMODE and return the result. */
|
||
extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
|
||
|
||
/* Emit code to move a block Y to a block X. */
|
||
extern void emit_block_move PROTO((rtx, rtx, rtx, int));
|
||
|
||
/* Copy all or part of a value X into registers starting at REGNO.
|
||
The number of registers to be filled is NREGS. */
|
||
extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
|
||
|
||
/* Copy all or part of a BLKmode value X out of registers starting at REGNO.
|
||
The number of registers to be filled is NREGS. */
|
||
extern void move_block_from_reg PROTO((int, rtx, int, int));
|
||
|
||
/* Mark REG as holding a parameter for the next CALL_INSN. */
|
||
extern void use_reg PROTO((rtx*, rtx));
|
||
/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
|
||
for the next CALL_INSN. */
|
||
extern void use_regs PROTO((rtx*, int, int));
|
||
|
||
/* Write zeros through the storage of OBJECT.
|
||
If OBJECT has BLKmode, SIZE is its length in bytes. */
|
||
extern void clear_storage PROTO((rtx, rtx));
|
||
|
||
/* Emit insns to set X from Y. */
|
||
extern rtx emit_move_insn PROTO((rtx, rtx));
|
||
|
||
/* Emit insns to set X from Y, with no frills. */
|
||
extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
|
||
|
||
/* Push a block of length SIZE (perhaps variable)
|
||
and return an rtx to address the beginning of the block. */
|
||
extern rtx push_block PROTO((rtx, int, int));
|
||
|
||
/* Make an operand to push something on the stack. */
|
||
extern rtx gen_push_operand PROTO((void));
|
||
|
||
#ifdef TREE_CODE
|
||
/* Generate code to push something onto the stack, given its mode and type. */
|
||
extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
|
||
int, rtx, int, rtx, rtx));
|
||
|
||
/* Emit library call. */
|
||
extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
|
||
enum machine_mode outmode, int nargs, ...));
|
||
extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
|
||
enum machine_mode outmode, int nargs, ...));
|
||
|
||
/* Expand an assignment that stores the value of FROM into TO. */
|
||
extern rtx expand_assignment PROTO((tree, tree, int, int));
|
||
|
||
/* Generate code for computing expression EXP,
|
||
and storing the value into TARGET.
|
||
If SUGGEST_REG is nonzero, copy the value through a register
|
||
and return that register, if that is possible. */
|
||
extern rtx store_expr PROTO((tree, rtx, int));
|
||
#endif
|
||
|
||
/* Given an rtx that may include add and multiply operations,
|
||
generate them as insns and return a pseudo-reg containing the value.
|
||
Useful after calling expand_expr with 1 as sum_ok. */
|
||
extern rtx force_operand PROTO((rtx, rtx));
|
||
|
||
#ifdef TREE_CODE
|
||
/* Generate code for computing expression EXP.
|
||
An rtx for the computed value is returned. The value is never null.
|
||
In the case of a void EXP, const0_rtx is returned. */
|
||
extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
|
||
enum expand_modifier));
|
||
#endif
|
||
|
||
/* At the start of a function, record that we have no previously-pushed
|
||
arguments waiting to be popped. */
|
||
extern void init_pending_stack_adjust PROTO((void));
|
||
|
||
/* When exiting from function, if safe, clear out any pending stack adjust
|
||
so the adjustment won't get done. */
|
||
extern void clear_pending_stack_adjust PROTO((void));
|
||
|
||
/* Pop any previously-pushed arguments that have not been popped yet. */
|
||
extern void do_pending_stack_adjust PROTO((void));
|
||
|
||
#ifdef TREE_CODE
|
||
/* Expand all cleanups up to OLD_CLEANUPS. */
|
||
extern void expand_cleanups_to PROTO((tree));
|
||
|
||
/* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
|
||
extern void jumpifnot PROTO((tree, rtx));
|
||
|
||
/* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
|
||
extern void jumpif PROTO((tree, rtx));
|
||
|
||
/* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
|
||
the result is zero, or IF_TRUE_LABEL if the result is one. */
|
||
extern void do_jump PROTO((tree, rtx, rtx));
|
||
#endif
|
||
|
||
/* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
|
||
extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
|
||
enum machine_mode, rtx, int));
|
||
|
||
/* Generate a tablejump instruction (used for switch statements). */
|
||
extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
|
||
|
||
#ifdef TREE_CODE
|
||
/* rtl.h and tree.h were included. */
|
||
/* Return an rtx for the size in bytes of the value of an expr. */
|
||
extern rtx expr_size PROTO((tree));
|
||
|
||
extern rtx lookup_static_chain PROTO((tree));
|
||
|
||
/* Convert a stack slot address ADDR valid in function FNDECL
|
||
into an address valid in this function (using a static chain). */
|
||
extern rtx fix_lexical_addr PROTO((rtx, tree));
|
||
|
||
/* Return the address of the trampoline for entering nested fn FUNCTION. */
|
||
extern rtx trampoline_address PROTO((tree));
|
||
|
||
/* Return an rtx that refers to the value returned by a function
|
||
in its original home. This becomes invalid if any more code is emitted. */
|
||
extern rtx hard_function_value PROTO((tree, tree));
|
||
|
||
extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
|
||
|
||
extern rtx expand_call PROTO((tree, rtx, int));
|
||
|
||
extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
|
||
extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
|
||
extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
|
||
extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
|
||
/* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
|
||
extern rtx label_rtx PROTO((tree));
|
||
#endif
|
||
|
||
/* Indicate how an input argument register was promoted. */
|
||
extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
|
||
|
||
/* Return an rtx like arg but sans any constant terms.
|
||
Returns the original rtx if it has no constant terms.
|
||
The constant terms are added and stored via a second arg. */
|
||
extern rtx eliminate_constant_term PROTO((rtx, rtx *));
|
||
|
||
/* Convert arg to a valid memory address for specified machine mode,
|
||
by emitting insns to perform arithmetic if nec. */
|
||
extern rtx memory_address PROTO((enum machine_mode, rtx));
|
||
|
||
/* Like `memory_address' but pretent `flag_force_addr' is 0. */
|
||
extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
|
||
|
||
/* Return a memory reference like MEMREF, but with its mode changed
|
||
to MODE and its address changed to ADDR.
|
||
(VOIDmode means don't change the mode.
|
||
NULL for ADDR means don't change the address.) */
|
||
extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
|
||
|
||
/* Return a memory reference like MEMREF, but which is known to have a
|
||
valid address. */
|
||
|
||
extern rtx validize_mem PROTO((rtx));
|
||
|
||
/* Assemble the static constant template for function entry trampolines. */
|
||
extern rtx assemble_trampoline_template PROTO((void));
|
||
|
||
/* Return 1 if two rtx's are equivalent in structure and elements. */
|
||
extern int rtx_equal_p PROTO((rtx, rtx));
|
||
|
||
/* Given rtx, return new rtx whose address won't be affected by
|
||
any side effects. It has been copied to a new temporary reg. */
|
||
extern rtx stabilize PROTO((rtx));
|
||
|
||
/* Given an rtx, copy all regs it refers to into new temps
|
||
and return a modified copy that refers to the new temps. */
|
||
extern rtx copy_all_regs PROTO((rtx));
|
||
|
||
/* Copy given rtx to a new temp reg and return that. */
|
||
extern rtx copy_to_reg PROTO((rtx));
|
||
|
||
/* Like copy_to_reg but always make the reg Pmode. */
|
||
extern rtx copy_addr_to_reg PROTO((rtx));
|
||
|
||
/* Like copy_to_reg but always make the reg the specified mode MODE. */
|
||
extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
|
||
|
||
/* Copy given rtx to given temp reg and return that. */
|
||
extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
|
||
|
||
/* Copy a value to a register if it isn't already a register.
|
||
Args are mode (in case value is a constant) and the value. */
|
||
extern rtx force_reg PROTO((enum machine_mode, rtx));
|
||
|
||
/* Return given rtx, copied into a new temp reg if it was in memory. */
|
||
extern rtx force_not_mem PROTO((rtx));
|
||
|
||
#ifdef TREE_CODE
|
||
/* Return mode and signedness to use when object is promoted. */
|
||
extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
|
||
int *, int));
|
||
#endif
|
||
|
||
/* Remove some bytes from the stack. An rtx says how many. */
|
||
extern void adjust_stack PROTO((rtx));
|
||
|
||
/* Add some bytes to the stack. An rtx says how many. */
|
||
extern void anti_adjust_stack PROTO((rtx));
|
||
|
||
/* This enum is used for the following two functions. */
|
||
enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
|
||
|
||
/* Save the stack pointer at the specified level. */
|
||
extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
|
||
|
||
/* Restore the stack pointer from a save area of the specified level. */
|
||
extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
|
||
|
||
/* Allocate some space on the stack dynamically and return its address. An rtx
|
||
says how many bytes. */
|
||
extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
|
||
|
||
/* Emit code to copy function value to a new temp reg and return that reg. */
|
||
extern rtx function_value ();
|
||
|
||
/* Return an rtx that refers to the value returned by a library call
|
||
in its original home. This becomes invalid if any more code is emitted. */
|
||
extern rtx hard_libcall_value PROTO((enum machine_mode));
|
||
|
||
/* Given an rtx, return an rtx for a value rounded up to a multiple
|
||
of STACK_BOUNDARY / BITS_PER_UNIT. */
|
||
extern rtx round_push PROTO((rtx));
|
||
|
||
extern void emit_block_move PROTO((rtx, rtx, rtx, int));
|
||
|
||
extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
|
||
extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
|
||
extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
|
||
extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
|
||
|
||
extern rtx assemble_static_space PROTO((int));
|
||
|
||
/* Hook called by expand_expr for language-specific tree codes.
|
||
It is up to the language front end to install a hook
|
||
if it has any such codes that expand_expr needs to know about. */
|
||
extern rtx (*lang_expand_expr) ();
|