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| author | H.J. Lu <hjl.tools@gmail.com> | 2016-03-28 04:39:48 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-03-28 04:40:03 -0700 |
| commit | e41b395523040fcb58c7d378475720c2836d280c (patch) | |
| tree | 7a4271638219c8d5b141039178105b0f1564ea16 /ChangeLog | |
| parent | b66d837bb5398795c6b0f651bd5a5d66091d8577 (diff) | |
| download | glibc-e41b395523040fcb58c7d378475720c2836d280c.tar.xz glibc-e41b395523040fcb58c7d378475720c2836d280c.zip | |
[x86] Add a feature bit: Fast_Unaligned_Copy
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 'ChangeLog')
| -rw-r--r-- | ChangeLog | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -1,3 +1,17 @@ +2016-03-28 H.J. Lu <hongjiu.lu@intel.com> + Amit Pawar <Amit.Pawar@amd.com> + + [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. + 2016-03-25 Florian Weimer <fweimer@redhat.com> [BZ #19791] |