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| author | Andrew Senkevich <andrew.senkevich@intel.com> | 2014-12-29 14:39:46 +0300 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2014-12-30 07:19:38 -0800 |
| commit | 8b4416d83c79ba77b0669203741c712880a09ae4 (patch) | |
| tree | c0701090d02b9e3c9ddcb840e2ad62084c498b4a /bits/stat.h | |
| parent | 6d6d7fde04c8ef830205a9900bf101597a2f4b18 (diff) | |
| download | glibc-8b4416d83c79ba77b0669203741c712880a09ae4.tar.gz glibc-8b4416d83c79ba77b0669203741c712880a09ae4.tar.xz glibc-8b4416d83c79ba77b0669203741c712880a09ae4.zip | |
i386: memcpy functions with SSE2 unaligned load/store
These new memcpy functions are the 32-bit version of x86_64 SSE2 unaligned memcpy. Memcpy average performace benefit is 18% on Silvermont, other platforms also improved about 35%, benchmarked on Silvermont, Haswell, Ivy Bridge, Sandy Bridge and Westmere, performance results attached in https://sourceware.org/ml/libc-alpha/2014-07/msg00157.html * sysdeps/i386/i686/multiarch/bcopy-sse2-unaligned.S: New file. * sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S: Likewise. * sysdeps/i386/i686/multiarch/memmove-sse2-unaligned.S: Likewise. * sysdeps/i386/i686/multiarch/mempcpy-sse2-unaligned.S: Likewise. * sysdeps/i386/i686/multiarch/bcopy.S: Select the sse2_unaligned version if bit_Fast_Unaligned_Load is set. * sysdeps/i386/i686/multiarch/memcpy.S: Likewise. * sysdeps/i386/i686/multiarch/memcpy_chk.S: Likewise. * sysdeps/i386/i686/multiarch/memmove.S: Likewise. * sysdeps/i386/i686/multiarch/memmove_chk.S: Likewise. * sysdeps/i386/i686/multiarch/mempcpy.S: Likewise. * sysdeps/i386/i686/multiarch/mempcpy_chk.S: Likewise. * sysdeps/i386/i686/multiarch/Makefile (sysdep_routines): Add bcopy-sse2-unaligned, memcpy-sse2-unaligned, memmove-sse2-unaligned and mempcpy-sse2-unaligned. * sysdeps/i386/i686/multiarch/ifunc-impl-list.c (MAX_IFUNC): Set to 4. (__libc_ifunc_impl_list): Test __bcopy_sse2_unaligned, __memmove_chk_sse2_unaligned, __memmove_sse2_unaligned, __memcpy_chk_sse2_unaligned, __memcpy_sse2_unaligned, __mempcpy_chk_sse2_unaligned, and __mempcpy_sse2_unaligned.
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