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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-07-13 16:32:59 -0700 |
|---|---|---|
| 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-evex.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-evex.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/strcmp-evex.S | 20 |
1 files changed, 6 insertions, 14 deletions
diff --git a/sysdeps/x86_64/multiarch/strcmp-evex.S b/sysdeps/x86_64/multiarch/strcmp-evex.S index afbf13a230..e482d0167f 100644 --- a/sysdeps/x86_64/multiarch/strcmp-evex.S +++ b/sysdeps/x86_64/multiarch/strcmp-evex.S @@ -16,7 +16,12 @@ 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 (4) + +# define STRCMP_ISA _evex +# include "strcmp-naming.h" # include <sysdep.h> # if defined USE_AS_STRCASECMP_L @@ -37,10 +42,6 @@ # define VMOVA vmovdqa64 # ifdef USE_AS_WCSCMP -# ifndef OVERFLOW_STRCMP -# define OVERFLOW_STRCMP __wcscmp_evex -# endif - # define TESTEQ subl $0xff, /* Compare packed dwords. */ # define VPCMP vpcmpd @@ -50,10 +51,6 @@ /* 1 dword char == 4 bytes. */ # define SIZE_OF_CHAR 4 # else -# ifndef OVERFLOW_STRCMP -# define OVERFLOW_STRCMP __strcmp_evex -# endif - # define TESTEQ incl /* Compare packed bytes. */ # define VPCMP vpcmpb @@ -120,15 +117,11 @@ # ifdef USE_AS_STRCASECMP_L # ifdef USE_AS_STRNCMP -# define STRCASECMP __strncasecmp_evex # define LOCALE_REG rcx # define LOCALE_REG_LP RCX_LP -# define STRCASECMP_L_NONASCII __strncasecmp_l_nonascii # else -# define STRCASECMP __strcasecmp_evex # define LOCALE_REG rdx # define LOCALE_REG_LP RDX_LP -# define STRCASECMP_L_NONASCII __strcasecmp_l_nonascii # endif # endif @@ -214,7 +207,6 @@ .align 16 .type STRCMP, @function .globl STRCMP - # ifdef USE_AS_STRCASECMP_L ENTRY (STRCASECMP) movq __libc_tsd_LOCALE@gottpoff(%rip), %rax |