From 1a153e47fcc9401d8ea424ad86569a57ed0f8c52 Mon Sep 17 00:00:00 2001 From: Leonardo Sandoval Date: Mon, 8 Oct 2018 08:59:50 -0500 Subject: x86-64: Optimize strcat/strncat, strcpy/strncpy and stpcpy/stpncpy with AVX2 Optimize x86-64 strcat/strncat, strcpy/strncpy and stpcpy/stpncpy with AVX2. It uses vector comparison as much as possible. In general, the larger the source string, the greater performance gain observed, reaching speedups of 1.6x compared to SSE2 unaligned routines. Select AVX2 strcat/strncat, strcpy/strncpy and stpcpy/stpncpy on AVX2 machines where vzeroupper is preferred and AVX unaligned load is fast. * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add strcat-avx2, strncat-avx2, strcpy-avx2, strncpy-avx2, stpcpy-avx2 and stpncpy-avx2. * sysdeps/x86_64/multiarch/ifunc-impl-list.c: (__libc_ifunc_impl_list): Add tests for __strcat_avx2, __strncat_avx2, __strcpy_avx2, __strncpy_avx2, __stpcpy_avx2 and __stpncpy_avx2. * sysdeps/x86_64/multiarch/{ifunc-unaligned-ssse3.h => ifunc-strcpy.h}: rename header for a more generic name. * sysdeps/x86_64/multiarch/ifunc-strcpy.h: (IFUNC_SELECTOR): Return OPTIMIZE (avx2) on AVX 2 machines if AVX unaligned load is fast and vzeroupper is preferred. * sysdeps/x86_64/multiarch/stpcpy-avx2.S: New file * sysdeps/x86_64/multiarch/stpncpy-avx2.S: Likewise * sysdeps/x86_64/multiarch/strcat-avx2.S: Likewise * sysdeps/x86_64/multiarch/strcpy-avx2.S: Likewise * sysdeps/x86_64/multiarch/strncat-avx2.S: Likewise * sysdeps/x86_64/multiarch/strncpy-avx2.S: Likewise --- sysdeps/x86_64/multiarch/strncat-avx2.S | 3 +++ 1 file changed, 3 insertions(+) create mode 100644 sysdeps/x86_64/multiarch/strncat-avx2.S (limited to 'sysdeps/x86_64/multiarch/strncat-avx2.S') diff --git a/sysdeps/x86_64/multiarch/strncat-avx2.S b/sysdeps/x86_64/multiarch/strncat-avx2.S new file mode 100644 index 0000000000..bfefa659bb --- /dev/null +++ b/sysdeps/x86_64/multiarch/strncat-avx2.S @@ -0,0 +1,3 @@ +#define USE_AS_STRNCAT +#define STRCAT __strncat_avx2 +#include "strcat-avx2.S" -- cgit 1.4.1