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| author | H.J. Lu <hjl.tools@gmail.com> | 2016-03-23 10:33:19 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-03-23 10:56:38 -0700 |
| commit | 327aadf6348bd41d1fae46ee7780e214c0a493c1 (patch) | |
| tree | 3a1f3550ee36ea010e53e1ad8f4e1ffc450b5c18 /posix/tst-preadwrite.c | |
| parent | 7a25d6a84df9fea56963569ceccaaf7c2a88f161 (diff) | |
| download | glibc-hjl/pr19583.zip glibc-hjl/pr19583.tar.gz glibc-hjl/pr19583.tar.bz2 | |
[x86] Add a feature bit: Fast_Unaligned_Copyhjl/pr19583
On AMD processors, memcpy optimized with unaligned SSE load is
slower than emcpy optimized with aligned SSSE3 while other string
functions are faster with unaligned SSE load. A feature bit,
Fast_Unaligned_Copy, is added to select memcpy optimized with
unaligned SSE load.
[BZ #19583]
* sysdeps/x86/cpu-features.c (init_cpu_features): Set
Fast_Unaligned_Copy with Fast_Unaligned_Load for Intel
processors. Set Fast_Copy_Backward for AMD Excavator
processors.
* sysdeps/x86/cpu-features.h (bit_arch_Fast_Unaligned_Copy):
New.
(index_arch_Fast_Unaligned_Copy): Likewise.
* sysdeps/x86_64/multiarch/memcpy.S (__new_memcpy): Check
Fast_Unaligned_Copy instead of Fast_Unaligned_Load.
Diffstat (limited to 'posix/tst-preadwrite.c')
0 files changed, 0 insertions, 0 deletions