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cse.c (fold_rtx): Remove redundant gen_rtx_CONST.

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gcc/
	* cse.c (fold_rtx): Remove redundant gen_rtx_CONST.

From-SVN: r141775
This commit is contained in:
Richard Sandiford 2008-11-11 23:24:05 +00:00 • committed by Richard Sandiford
parent 2f1e2391d8
commit 1300342b45
2 changed files with 4 additions and 18 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2008-11-11 Richard Sandiford <rdsandiford@googlemail.com>
* cse.c (fold_rtx): Remove redundant gen_rtx_CONST.
2008-11-11 Richard Sandiford <rdsandiford@googlemail.com>
PR rtl-optimization/37363

18
gcc/cse.c
View file

@ -3171,33 +3171,15 @@ fold_rtx (rtx x, rtx insn)
{
case RTX_UNARY:
{
int is_const = 0;
/* We can't simplify extension ops unless we know the
original mode. */
if ((code == ZERO_EXTEND || code == SIGN_EXTEND)
&& mode_arg0 == VOIDmode)
break;
/* If we had a CONST, strip it off and put it back later if we
fold. */
if (const_arg0 != 0 && GET_CODE (const_arg0) == CONST)
is_const = 1, const_arg0 = XEXP (const_arg0, 0);
new_rtx = simplify_unary_operation (code, mode,
const_arg0 ? const_arg0 : folded_arg0,
mode_arg0);
/* NEG of PLUS could be converted into MINUS, but that causes
expressions of the form
(CONST (MINUS (CONST_INT) (SYMBOL_REF)))
which many ports mistakenly treat as LEGITIMATE_CONSTANT_P.
FIXME: those ports should be fixed. */
if (new_rtx != 0 && is_const
&& GET_CODE (new_rtx) == PLUS
&& (GET_CODE (XEXP (new_rtx, 0)) == SYMBOL_REF
|| GET_CODE (XEXP (new_rtx, 0)) == LABEL_REF)
&& GET_CODE (XEXP (new_rtx, 1)) == CONST_INT)
new_rtx = gen_rtx_CONST (mode, new_rtx);
}
break;