diff options
| 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 /sysdeps/x86_64/multiarch/memcpy.S | |
| parent | b66d837bb5398795c6b0f651bd5a5d66091d8577 (diff) | |
| download | glibc-e41b395523040fcb58c7d378475720c2836d280c.tar glibc-e41b395523040fcb58c7d378475720c2836d280c.tar.gz glibc-e41b395523040fcb58c7d378475720c2836d280c.tar.bz2 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 'sysdeps/x86_64/multiarch/memcpy.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memcpy.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/x86_64/multiarch/memcpy.S b/sysdeps/x86_64/multiarch/memcpy.S index 8882590e51..5b045d7847 100644 --- a/sysdeps/x86_64/multiarch/memcpy.S +++ b/sysdeps/x86_64/multiarch/memcpy.S @@ -42,7 +42,7 @@ ENTRY(__new_memcpy) HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load) jnz 2f lea __memcpy_sse2_unaligned(%rip), %RAX_LP - HAS_ARCH_FEATURE (Fast_Unaligned_Load) + HAS_ARCH_FEATURE (Fast_Unaligned_Copy) jnz 2f lea __memcpy_sse2(%rip), %RAX_LP HAS_CPU_FEATURE (SSSE3) |