From 5f3d0b78e011d2a72f9e88b0e9ef5bc081d18f97 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Fri, 30 Jan 2015 06:50:20 -0800 Subject: 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. --- ChangeLog | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'ChangeLog') diff --git a/ChangeLog b/ChangeLog index 26f7f3f3b1..a696e396b2 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,21 @@ +2015-01-30 H.J. Lu + + [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. + 2015-01-29 Andreas Schwab * sysdeps/nptl/allocrtsig.c: Include . -- cgit v1.2.3