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/strcmp-avx2.S | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) (limited to 'sysdeps/x86_64/multiarch/strcmp-avx2.S') diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S index 3ab21e3a58..4c01d664e8 100644 --- a/sysdeps/x86_64/multiarch/strcmp-avx2.S +++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S @@ -16,7 +16,15 @@ License along with the GNU C Library; if not, see . */ -#if IS_IN (libc) +#include + +#if ISA_SHOULD_BUILD (3) + +# ifndef STRCMP_ISA +# define STRCMP_ISA _avx2 +# endif + +# include "strcmp-naming.h" # include @@ -86,15 +94,11 @@ # ifdef USE_AS_STRCASECMP_L # ifdef USE_AS_STRNCMP -# define STRCASECMP __strncasecmp_avx2 # define LOCALE_REG rcx # define LOCALE_REG_LP RCX_LP -# define STRCASECMP_L_NONASCII __strncasecmp_l_nonascii # else -# define STRCASECMP __strcasecmp_avx2 # define LOCALE_REG rdx # define LOCALE_REG_LP RDX_LP -# define STRCASECMP_L_NONASCII __strcasecmp_l_nonascii # endif # endif @@ -185,18 +189,14 @@ .type STRCMP, @function .globl STRCMP -# ifndef GLABEL -# define GLABEL(...) __VA_ARGS__ -# endif - # ifdef USE_AS_STRCASECMP_L -ENTRY (GLABEL(STRCASECMP)) +ENTRY (STRCASECMP) movq __libc_tsd_LOCALE@gottpoff(%rip), %rax mov %fs:(%rax), %LOCALE_REG_LP /* Either 1 or 5 bytes (dependeing if CET is enabled). */ .p2align 4 -END (GLABEL(STRCASECMP)) +END (STRCASECMP) /* FALLTHROUGH to strcasecmp/strncasecmp_l. */ # endif -- cgit 1.4.1