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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-06 17:25:42 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-21 16:15:42 -0300 |
| commit | 4862d546c04bd2caf496d48335a546c0a44ad4a5 (patch) | |
| tree | 3e8bbae532c3dcc5ff93dde172500467aaaaf1f5 /sysdeps/x86_64/multiarch | |
| parent | eb9291aaa6ff6af158a1436b881ef8b834559621 (diff) | |
| download | glibc-4862d546c04bd2caf496d48335a546c0a44ad4a5.tar glibc-4862d546c04bd2caf496d48335a546c0a44ad4a5.tar.gz glibc-4862d546c04bd2caf496d48335a546c0a44ad4a5.tar.bz2 glibc-4862d546c04bd2caf496d48335a546c0a44ad4a5.zip | |
x86: Use dl-symbol-redir-ifunc.h on cpu-tunables
The dl-symbol-redir-ifunc.h redirects compiler-generated libcalls to
arch-specific memory implementations to avoid ifunc calls where it is not
yet possible. The memcmp-isa-default-impl.h aims to fix the same issue
by calling the specific memset implementation directly.
Using the memcmp symbol directly allows the compiler to inline the memset
calls (especially because _dl_tunable_set_hwcaps uses constants values),
generating better code.
Checked on x86_64-linux-gnu.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'sysdeps/x86_64/multiarch')
| -rw-r--r-- | sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h b/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h index 3fe73ca1c3..c7d8961bb6 100644 --- a/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h +++ b/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h @@ -19,6 +19,8 @@ #ifndef _DL_IFUNC_GENERIC_H #define _DL_IFUNC_GENERIC_H +#ifndef SHARED + #include <isa-level.h> #if MINIMUM_X86_ISA_LEVEL >= 4 @@ -31,4 +33,17 @@ asm ("memset = " HAVE_MEMSET_IFUNC_GENERIC); + +#if MINIMUM_X86_ISA_LEVEL >= 4 +# define HAVE_MEMCMP_IFUNC_GENERIC "__memcmp_evex_movbe" +#elif MINIMUM_X86_ISA_LEVEL == 3 +# define HAVE_MEMCMP_IFUNC_GENERIC "__memcmp_avx2_movbe" +#else +# define HAVE_MEMCMP_IFUNC_GENERIC "__memcmp_sse2" +#endif + +asm ("memcmp = " HAVE_MEMCMP_IFUNC_GENERIC); + +#endif /* SHARED */ + #endif |