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gcse.c (local_cprop_find_used_regs): New.

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* gcse.c (local_cprop_find_used_regs): New.
        (local_cprop_pass): Use it.

From-SVN: r62555
This commit is contained in:
Richard Henderson 2003-02-07 14:57:41 -08:00 committed by Richard Henderson
parent 3ef879d2ae
commit 710ee3ed76
2 changed files with 56 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2003-02-07 Richard Henderson <rth@redhat.com>
PR 9226
* gcse.c (local_cprop_find_used_regs): New.
(local_cprop_pass): Use it.
2003-02-07 Fred Fish <fnf@intrinsity.com>
* mips-tfile.c (parse_def): Parenthesize assignments to fix

52
gcc/gcse.c
View File

@ -706,6 +706,7 @@ static void free_insn_expr_list_list PARAMS ((rtx *));
static void clear_modify_mem_tables PARAMS ((void));
static void free_modify_mem_tables PARAMS ((void));
static rtx gcse_emit_move_after PARAMS ((rtx, rtx, rtx));
static void local_cprop_find_used_regs PARAMS ((rtx *, void *));
static bool do_local_cprop PARAMS ((rtx, rtx, int, rtx*));
static bool adjust_libcall_notes PARAMS ((rtx, rtx, rtx, rtx*));
static void local_cprop_pass PARAMS ((int));
@ -4258,6 +4259,53 @@ cprop_insn (insn, alter_jumps)
return changed;
}
/* Like find_used_regs, but avoid recording uses that appear in
input-output contexts such as zero_extract or pre_dec. This
restricts the cases we consider to those for which local cprop
can legitimately make replacements. */
static void
local_cprop_find_used_regs (xptr, data)
rtx *xptr;
void *data;
{
rtx x = *xptr;
if (x == 0)
return;
switch (GET_CODE (x))
{
case ZERO_EXTRACT:
case SIGN_EXTRACT:
case STRICT_LOW_PART:
return;
case PRE_DEC:
case PRE_INC:
case POST_DEC:
case POST_INC:
case PRE_MODIFY:
case POST_MODIFY:
/* Can only legitimately appear this early in the context of
stack pushes for function arguments, but handle all of the
codes nonetheless. */
return;
case SUBREG:
/* Setting a subreg of a register larger than word_mode leaves
the non-written words unchanged. */
if (GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (x))) > BITS_PER_WORD)
return;
break;
default:
break;
}
find_used_regs (xptr, data);
}
/* LIBCALL_SP is a zero-terminated array of insns at the end of a libcall;
their REG_EQUAL notes need updating. */
@ -4413,9 +4461,9 @@ local_cprop_pass (alter_jumps)
do
{
reg_use_count = 0;
note_uses (&PATTERN (insn), find_used_regs, NULL);
note_uses (&PATTERN (insn), local_cprop_find_used_regs, NULL);
if (note)
find_used_regs (&XEXP (note, 0), NULL);
local_cprop_find_used_regs (&XEXP (note, 0), NULL);
for (reg_used = &reg_use_table[0]; reg_use_count > 0;
reg_used++, reg_use_count--)