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| author | Haochen Gui <guihaoc@gcc.gnu.org> | 2024-04-25 09:55:53 +0800 |
|---|---|---|
| committer | Haochen Gui <guihaoc@gcc.gnu.org> | 2024-04-25 09:55:53 +0800 |
| commit | 09680e3ee7d72978b493dd4127ce2e769f96a45e (patch) | |
| tree | 1bae44e8ec8379df7fff3d7bee90dbd5b20dc743 | |
| parent | d44c2052c59545731edcf7f99a32bcef3b0415b6 (diff) | |
| download | gcc-09680e3ee7d72978b493dd4127ce2e769f96a45e.zip gcc-09680e3ee7d72978b493dd4127ce2e769f96a45e.tar.gz gcc-09680e3ee7d72978b493dd4127ce2e769f96a45e.tar.bz2 | |
rs6000: Use bcdsub. instead of bcdadd. for bcd invalid number checking
bcdadd. might causes overflow which also set the overflow/invalid bit.
bcdsub. doesn't have the issue when do subtracting on two same bcd number.
gcc/
* config/rs6000/altivec.md (*bcdinvalid_<mode>): Replace bcdadd
with bcdsub.
(bcdinvalid_<mode>): Likewise.
gcc/testsuite/
* gcc.target/powerpc/bcd-4.c: Adjust the number of bcdadd and
bcdsub.
| -rw-r--r-- | gcc/config/rs6000/altivec.md | 6 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.target/powerpc/bcd-4.c | 4 |
2 files changed, 5 insertions, 5 deletions
diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md index 4d4c94f..bb20441 100644 --- a/gcc/config/rs6000/altivec.md +++ b/gcc/config/rs6000/altivec.md @@ -4586,18 +4586,18 @@ [(set (reg:CCFP CR6_REGNO) (compare:CCFP (unspec:V2DF [(match_operand:VBCD 1 "register_operand" "v")] - UNSPEC_BCDADD) + UNSPEC_BCDSUB) (match_operand:V2DF 2 "zero_constant" "j"))) (clobber (match_scratch:VBCD 0 "=v"))] "TARGET_P8_VECTOR" - "bcdadd. %0,%1,%1,0" + "bcdsub. %0,%1,%1,0" [(set_attr "type" "vecsimple")]) (define_expand "bcdinvalid_<mode>" [(parallel [(set (reg:CCFP CR6_REGNO) (compare:CCFP (unspec:V2DF [(match_operand:VBCD 1 "register_operand")] - UNSPEC_BCDADD) + UNSPEC_BCDSUB) (match_dup 2))) (clobber (match_scratch:VBCD 3))]) (set (match_operand:SI 0 "register_operand") diff --git a/gcc/testsuite/gcc.target/powerpc/bcd-4.c b/gcc/testsuite/gcc.target/powerpc/bcd-4.c index 2c7041c..6d2c59e 100644 --- a/gcc/testsuite/gcc.target/powerpc/bcd-4.c +++ b/gcc/testsuite/gcc.target/powerpc/bcd-4.c @@ -2,8 +2,8 @@ /* { dg-require-effective-target int128 } */ /* { dg-require-effective-target p9vector_hw } */ /* { dg-options "-mdejagnu-cpu=power9 -O2 -save-temps" } */ -/* { dg-final { scan-assembler-times {\mbcdadd\M} 7 } } */ -/* { dg-final { scan-assembler-times {\mbcdsub\M} 18 } } */ +/* { dg-final { scan-assembler-times {\mbcdadd\M} 5 } } */ +/* { dg-final { scan-assembler-times {\mbcdsub\M} 20 } } */ /* { dg-final { scan-assembler-times {\mbcds\M} 2 } } */ /* { dg-final { scan-assembler-times {\mdenbcdq\M} 1 } } */ |