diff options
| 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 12:26:33 -0800 |
| commit | 328fc20e5e334a642f0152d9662474789381a897 (patch) | |
| tree | 6efc6b6b150d1373c36c8bdaf4a606989c152a9a /include/elf.h | |
| parent | f80af76648ed97a76745fad6caa3315a79cb1c7c (diff) | |
| download | glibc-hjl/release/2.20/master.zip glibc-hjl/release/2.20/master.tar.gz glibc-hjl/release/2.20/master.tar.bz2 | |
Use AVX unaligned memcpy only if AVX2 is availablehjl/release/2.20/master
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.
[cherry picked from commit 56d25c11b64a97255a115901d136d753c86de24e]
Diffstat (limited to 'include/elf.h')
0 files changed, 0 insertions, 0 deletions