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re PR target/22077 (vec_all_eq does not produce good result)

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PR 22077.
Oked by Roger Sayle.

From-SVN: r101211
This commit is contained in:
Fariborz Jahanian 2005-06-20 17:59:35 +00:00
parent b376133b7f
commit 8c98e9d03d
3 changed files with 21 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-06-20 Roger Sayle <roger@eyesopen.com>
2005-06-20 Fariborz Jahanian <fjahanian@apple.com>
* combine.c (simplify_set): Simplify setting of CC register
by removing redundant compare with 0 on RHS.
2005-06-20 Jan Beulich <jbeulich@novell.com>
* config/i386/netware-libgcc.def: Update copyright.

5
gcc/combine.c
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@ -5274,6 +5274,11 @@ simplify_set (rtx x)
SUBST (SET_SRC (x), gen_rtx_COMPARE (compare_mode, op0, op1));
src = SET_SRC (x);
}
else if (GET_MODE (op0) == compare_mode && op1 == const0_rtx)
{
SUBST(SET_SRC (x), op0);
src = SET_SRC (x);
}
else
{
/* Otherwise, update the COMPARE if needed. */

10
gcc/testsuite/gcc.dg/altivec-nomfcr.c Normal file
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@ -0,0 +1,10 @@
/* { dg-do compile { target powerpc-*-* } } */
/* { dg-options "-O3 -maltivec" } */
/* { dg-final { scan-assembler-not "mfcr" } } */
#include <altivec.h>
int foo(vector float x, vector float y) {
if (vec_all_eq(x,y)) return 3245;
else return 12;
}