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| author |   Aurelien Jarno <aurelien@aurel32.net> | 2022-10-03 23:16:46 +0200 |
|---|---|---|
| committer |   Andreas K. Hüttel <dilfridge@gentoo.org> | 2022-10-15 19:52:17 +0200 |
| commit | b85aa02d6fe51fa5891df9ae3ecbf8b93110c85a (patch) | |
| tree | 4d1174dcc1dbd1e7dcc68b7ea5645cd5b6107395 | |
| parent | x86-64: Require BMI2 for AVX2 wcs(n)cmp implementations (diff) | |
| download | glibc-b85aa02d6fe51fa5891df9ae3ecbf8b93110c85a.tar.gz glibc-b85aa02d6fe51fa5891df9ae3ecbf8b93110c85a.tar.bz2 glibc-b85aa02d6fe51fa5891df9ae3ecbf8b93110c85a.zip | |
x86-64: Require BMI2 for AVX2 (raw|w)memchr implementations
The AVX2 memchr, rawmemchr and wmemchr implementations use the 'bzhi'
and 'sarx' instructions, which belongs to the BMI2 CPU feature.
Fixes: acfd088a1963 ("x86: Optimize memchr-avx2.S")
Partially resolves: BZ #29611
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit e3e7fab7fe5186d18ca2046d99ba321c27db30ad)
(cherry picked from commit c85a45acacd6f2ecaa66128364e5621e0cdcab1b)
| -rw-r--r-- | sysdeps/x86_64/multiarch/ifunc-impl-list.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c index 5824554b4e..9959f7b228 100644 --- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c +++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c @@ -59,10 +59,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/memchr.c. */ IFUNC_IMPL (i, name, memchr, IFUNC_IMPL_ADD (array, i, memchr, - CPU_FEATURE_USABLE (AVX2), + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2)), __memchr_avx2) IFUNC_IMPL_ADD (array, i, memchr, (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) && CPU_FEATURE_USABLE (RTM)), __memchr_avx2_rtm) IFUNC_IMPL_ADD (array, i, memchr, @@ -301,10 +303,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/rawmemchr.c. */ IFUNC_IMPL (i, name, rawmemchr, IFUNC_IMPL_ADD (array, i, rawmemchr, - CPU_FEATURE_USABLE (AVX2), + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2)), __rawmemchr_avx2) IFUNC_IMPL_ADD (array, i, rawmemchr, (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) && CPU_FEATURE_USABLE (RTM)), __rawmemchr_avx2_rtm) IFUNC_IMPL_ADD (array, i, rawmemchr, @@ -805,10 +809,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/wmemchr.c. */ IFUNC_IMPL (i, name, wmemchr, IFUNC_IMPL_ADD (array, i, wmemchr, - CPU_FEATURE_USABLE (AVX2), + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2)), __wmemchr_avx2) IFUNC_IMPL_ADD (array, i, wmemchr, (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) && CPU_FEATURE_USABLE (RTM)), __wmemchr_avx2_rtm) IFUNC_IMPL_ADD (array, i, wmemchr, |