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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 /NEWS | |
| parent | b658fdd82b4524cf6a39881d092caa23f63d93ac (diff) | |
| download | glibc-5f3d0b78e011d2a72f9e88b0e9ef5bc081d18f97.tar.gz glibc-5f3d0b78e011d2a72f9e88b0e9ef5bc081d18f97.tar.xz 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 'NEWS')
| -rw-r--r-- | NEWS | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/NEWS b/NEWS index 8e2729bddd..c91b9fc58a 100644 --- a/NEWS +++ b/NEWS @@ -17,8 +17,8 @@ Version 2.21 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647, 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719, 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747, 17748, - 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797, 17803, - 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885, 17892. + 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797, 17801, + 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885, 17892. * A new semaphore algorithm has been implemented in generic C code for all machines. Previous custom assembly implementations of semaphore were |