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* cse (cse_insn): Don't make change without validation.

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From-SVN: r20996
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J"orn Rennecke 1998-07-07 13:09:07 +00:00 committed by Joern Rennecke
parent 8ea2460f6a
commit 759bd8b73b
2 changed files with 21 additions and 10 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Tue Jul 7 21:05:25 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* cse (cse_insn): Don't make change without validation.
Tue Jul 7 11:40:05 1998 Jeffrey A Law (law@cygnus.com)
* mn10200.md (various zero/sign extension patterns): zero and sign

27
gcc/cse.c
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@ -7004,17 +7004,24 @@ cse_insn (insn, libcall_insn)
SRC is a hard register. */
{
int first = qty_first_reg[reg_qty[REGNO (src)]];
rtx new_src
= (first >= FIRST_PSEUDO_REGISTER
? regno_reg_rtx[first] : gen_rtx_REG (GET_MODE (src), first));
src = SET_SRC (sets[i].rtl)
= first >= FIRST_PSEUDO_REGISTER ? regno_reg_rtx[first]
: gen_rtx_REG (GET_MODE (src), first);
/* If we had a constant that is cheaper than what we are now
setting SRC to, use that constant. We ignored it when we
thought we could make this into a no-op. */
if (src_const && COST (src_const) < COST (src)
&& validate_change (insn, &SET_SRC (sets[i].rtl), src_const, 0))
src = src_const;
/* We must use validate-change even for this, because this
might be a special no-op instruction, suitable only to
tag notes onto. */
if (validate_change (insn, &SET_SRC (sets[i].rtl), new_src, 0))
{
src = new_src;
/* If we had a constant that is cheaper than what we are now
setting SRC to, use that constant. We ignored it when we
thought we could make this into a no-op. */
if (src_const && COST (src_const) < COST (src)
&& validate_change (insn, &SET_SRC (sets[i].rtl), src_const,
0))
src = src_const;
}
}
/* If we made a change, recompute SRC values. */