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author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-07-13 16:32:59 -0700 |
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committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-07-16 03:07:59 -0700 |
commit | ceabdcd130ca7043b0fcf2676183d79431d10493 (patch) | |
tree | f6ced435023b66ac1f3b519e5b26a60ef8f479dd /sysdeps/x86_64/multiarch/strcmp-avx2.S | |
parent | c353689e49e72f3aafa1a9e68d4f7a4f33a79cbe (diff) | |
download | glibc-ceabdcd130ca7043b0fcf2676183d79431d10493.tar.gz glibc-ceabdcd130ca7043b0fcf2676183d79431d10493.tar.xz glibc-ceabdcd130ca7043b0fcf2676183d79431d10493.zip |
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.
Diffstat (limited to 'sysdeps/x86_64/multiarch/strcmp-avx2.S')
-rw-r--r-- | sysdeps/x86_64/multiarch/strcmp-avx2.S | 22 |
1 files changed, 11 insertions, 11 deletions
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 <https://www.gnu.org/licenses/>. */ -#if IS_IN (libc) +#include <isa-level.h> + +#if ISA_SHOULD_BUILD (3) + +# ifndef STRCMP_ISA +# define STRCMP_ISA _avx2 +# endif + +# include "strcmp-naming.h" # include <sysdep.h> @@ -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 |