From ceabdcd130ca7043b0fcf2676183d79431d10493 Mon Sep 17 00:00:00 2001 From: Noah Goldstein Date: Wed, 13 Jul 2022 16:32:59 -0700 Subject: x86: Add support to build strcmp/strlen/strchr with explicit ISA level 1. Add default ISA level selection in non-multiarch/rtld implementations. 2. Add ISA level build guards to different implementations. - I.e strcmp-avx2.S which is ISA level 3 will only build if compiled ISA level <= 3. Otherwise there is no reason to include it as we will always use one of the ISA level 4 implementations (strcmp-evex.S). 3. Refactor the ifunc selector and ifunc implementation list to use the ISA level aware wrapper macros that allow functions below the compiled ISA level (with a guranteed replacement) to be skipped. Tested with and without multiarch on x86_64 for ISA levels: {generic, x86-64-v2, x86-64-v3, x86-64-v4} And m32 with and without multiarch. --- sysdeps/x86_64/multiarch/strchrnul-avx2.S | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'sysdeps/x86_64/multiarch/strchrnul-avx2.S') diff --git a/sysdeps/x86_64/multiarch/strchrnul-avx2.S b/sysdeps/x86_64/multiarch/strchrnul-avx2.S index fa0cc09760..10ad5e6058 100644 --- a/sysdeps/x86_64/multiarch/strchrnul-avx2.S +++ b/sysdeps/x86_64/multiarch/strchrnul-avx2.S @@ -1,3 +1,8 @@ -#define STRCHR __strchrnul_avx2 +#ifndef STRCHRNUL +# define STRCHRNUL __strchrnul_avx2 +#endif + +#define STRCHR STRCHRNUL #define USE_AS_STRCHRNUL 1 + #include "strchr-avx2.S" -- cgit 1.4.1