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| author | H.J. Lu <hjl.tools@gmail.com> | 2015-01-30 06:50:20 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-01-30 15:37:58 -0800 |
| commit | 5f3d0b78e011d2a72f9e88b0e9ef5bc081d18f97 (patch) | |
| tree | 8eabf127206283d2421bc40b6bc44e123e346598 /sysdeps/x86_64/multiarch/memmove.c | |
| parent | b658fdd82b4524cf6a39881d092caa23f63d93ac (diff) | |
| download | glibc-5f3d0b78e011d2a72f9e88b0e9ef5bc081d18f97.tar glibc-5f3d0b78e011d2a72f9e88b0e9ef5bc081d18f97.tar.gz glibc-5f3d0b78e011d2a72f9e88b0e9ef5bc081d18f97.tar.bz2 glibc-5f3d0b78e011d2a72f9e88b0e9ef5bc081d18f97.zip | |
Use AVX unaligned memcpy only if AVX2 is available
memcpy with unaligned 256-bit AVX register loads/stores are slow on older
processorsl like Sandy Bridge. This patch adds bit_AVX_Fast_Unaligned_Load
and sets it only when AVX2 is available.
[BZ #17801]
* sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features):
Set the bit_AVX_Fast_Unaligned_Load bit for AVX2.
* sysdeps/x86_64/multiarch/init-arch.h (bit_AVX_Fast_Unaligned_Load):
New.
(index_AVX_Fast_Unaligned_Load): Likewise.
(HAS_AVX_FAST_UNALIGNED_LOAD): Likewise.
* sysdeps/x86_64/multiarch/memcpy.S (__new_memcpy): Check the
bit_AVX_Fast_Unaligned_Load bit instead of the bit_AVX_Usable bit.
* sysdeps/x86_64/multiarch/memcpy_chk.S (__memcpy_chk): Likewise.
* sysdeps/x86_64/multiarch/mempcpy.S (__mempcpy): Likewise.
* sysdeps/x86_64/multiarch/mempcpy_chk.S (__mempcpy_chk): Likewise.
* sysdeps/x86_64/multiarch/memmove.c (__libc_memmove): Replace
HAS_AVX with HAS_AVX_FAST_UNALIGNED_LOAD.
* sysdeps/x86_64/multiarch/memmove_chk.c (__memmove_chk): Likewise.
Diffstat (limited to 'sysdeps/x86_64/multiarch/memmove.c')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memmove.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/x86_64/multiarch/memmove.c b/sysdeps/x86_64/multiarch/memmove.c index d93bfd05c0..dd153a3eaa 100644 --- a/sysdeps/x86_64/multiarch/memmove.c +++ b/sysdeps/x86_64/multiarch/memmove.c @@ -49,7 +49,7 @@ extern __typeof (__redirect_memmove) __memmove_avx_unaligned attribute_hidden; ifunc symbol properly. */ extern __typeof (__redirect_memmove) __libc_memmove; libc_ifunc (__libc_memmove, - HAS_AVX + HAS_AVX_FAST_UNALIGNED_LOAD ? __memmove_avx_unaligned : (HAS_SSSE3 ? (HAS_FAST_COPY_BACKWARD |