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c41a66767d
glibc/sysdeps/x86_64
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Noah Goldstein c41a66767d x86: Optimize strcmp-evex.S 
Optimization are primarily to the loop logic and how the page cross
logic interacts with the loop.

The page cross logic is at times more expensive for short strings near
the end of a page but not crossing the page. This is done to retest
the page cross conditions with a non-faulty check and to improve the
logic for entering the loop afterwards. This is only particular cases,
however, and is general made up for by more than 10x improvements on
the transition from the page cross -> loop case.

The non-page cross cases as well are nearly universally improved.

test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 8418eb3ff4)
2022-05-05 08:53:42 -07:00
..
64
fpu x86-64: Optimize load of all bits set into ZMM register [BZ #28252] 2022-04-26 18:18:15 -07:00
multiarch x86: Optimize strcmp-evex.S 2022-05-05 08:53:42 -07:00
nptl nptl: Move pthread_spin_trylock into libc 2021-04-23 17:06:48 +02:00
x32 mcheck: Align struct hdr to MALLOC_ALIGNMENT bytes [BZ #28068] 2021-07-12 18:13:32 -07:00
____longjmp_chk.S
__longjmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
_mcount.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
abort-instr.h
add_n.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
addmul_1.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bsd-_setjmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bsd-setjmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bzero.S
configure x86_64: Remove unneeded static PIE check for undefined weak diagnostic 2021-07-08 14:26:22 -07:00
configure.ac x86_64: Remove unneeded static PIE check for undefined weak diagnostic 2021-07-08 14:26:22 -07:00
crti.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
crtn.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-hwcaps-subdirs.c <sys/platform/x86.h>: Remove the C preprocessor magic 2021-01-21 05:58:17 -08:00
dl-irel.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-machine.h elf: Fix dynamic-link.h usage on rtld.c 2022-04-08 14:18:11 -04:00
dl-procinfo.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-runtime.h elf: Add _dl_audit_pltexit 2022-04-08 14:18:12 -04:00
dl-tls.c elf: Use relaxed atomics for racy accesses [BZ #19329] 2021-05-11 17:16:37 +01:00
dl-tls.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-tlsdesc.h x86_64: Remove lazy tlsdesc relocation related code 2021-04-15 09:47:47 +01:00
dl-tlsdesc.S x86_64: Remove lazy tlsdesc relocation related code 2021-04-15 09:47:47 +01:00
dl-trampoline.h elf: Add _dl_audit_pltexit 2022-04-08 14:18:12 -04:00
dl-trampoline.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ffs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ffsll.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
htonl.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ifuncmain8.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ifuncmod8.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Implies Remove dbl-64/wordsize-64 (part 2) 2021-01-07 15:26:26 +00:00
isa.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
jmpbuf-offsets.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
l10nflist.c
link-defines.sym
locale-defines.sym
localplt.data mtrace: Wean away from malloc hooks 2021-07-22 18:38:06 +05:30
lshift.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
machine-gmon.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Makefile Add a generic malloc test for MALLOC_ALIGNMENT 2021-07-09 06:39:30 -07:00
memchr.S x86: Fix overflow bug with wmemchr-sse2 and wmemchr-avx2 [BZ #27974] 2021-06-23 14:13:03 -04:00
memcmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memcpy_chk.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memcpy.S
memmove_chk.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memmove.S x86: Optimize memmove-vec-unaligned-erms.S 2022-04-26 18:18:16 -07:00
mempcpy_chk.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mempcpy.S
memrchr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memset_chk.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memset.S x86: Optimize memset-vec-unaligned-erms.S 2022-04-26 18:18:16 -07:00
memusage.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mp_clz_tab.c
mul_1.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
preconfigure
preconfigure.ac
rawmemchr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
rshift.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
rtld-offsets.sym
setjmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stackguard-macros.h
stackinfo.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
start.S Reduce the statically linked startup code [BZ #23323] 2021-02-25 12:13:02 +01:00
stpcpy.S
strcasecmp_l-nonascii.c
strcasecmp_l.S
strcasecmp.S
strcat.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strchr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strchrnul.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strcmp.S x86-64: Replace movzx with movzbl 2022-04-26 18:18:16 -07:00
strcpy.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strcspn.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strlen.S x86-64: Move strlen.S to multiarch/strlen-vec.S 2021-06-23 10:24:35 -07:00
strncase_l-nonascii.c
strncase_l.S
strncase.S
strncmp.S
strnlen.S
strpbrk.S
strrchr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strspn.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sub_n.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
submul_1.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sysdep.h x86-64: Add AVX optimized string/memory functions for RTM 2021-03-29 07:40:17 -07:00
tls_get_addr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tls-macros.h
tlsdesc.c elf: Remove lazy tlsdesc relocation related code 2021-04-21 14:35:53 +01:00
tlsdesc.sym
tst-audit3.c
tst-audit4-aux.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-audit4.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-audit5.c
tst-audit6.c
tst-audit7.c
tst-audit10-aux.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-audit10.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-audit.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-auditmod3a.c
tst-auditmod3b.c
tst-auditmod4a.c
tst-auditmod4b.c
tst-auditmod5a.c
tst-auditmod5b.c
tst-auditmod6a.c
tst-auditmod6b.c
tst-auditmod6c.c
tst-auditmod7a.c
tst-auditmod7b.c
tst-auditmod10a.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-auditmod10b.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-avx512-aux.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-avx512.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-avx512mod.c
tst-avx-aux.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-avx.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-avxmod.c
tst-glibc-hwcaps.c <sys/platform/x86.h>: Remove the C preprocessor magic 2021-01-21 05:58:17 -08:00
tst-platform-1.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-platformmod-1.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-platformmod-2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-quad1.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-quad1pie.c
tst-quad2.c
tst-quad2pie.c
tst-quadmod1.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-quadmod1pie.S
tst-quadmod2.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-quadmod2pie.S
tst-rsi-strlen.c x86-64: Test strlen and wcslen with 0 in the RSI register [BZ #28064] 2021-07-08 18:55:40 -04:00
tst-rsi-wcslen.c x86-64: Test strlen and wcslen with 0 in the RSI register [BZ #28064] 2021-07-08 18:55:40 -04:00
tst-split-dynreloc.c
tst-split-dynreloc.lds
tst-sse.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-ssemod.c
tst-x86_64-1.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-x86_64mod-1.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-x86-64-tls-1.c x86_64: Correct THREAD_SETMEM/THREAD_SETMEM_NC for movq [BZ #27591] 2021-04-01 07:00:22 -07:00
Versions
wcschr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
wcscmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
wcslen.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
wcsrchr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
wmemset_chk.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
wmemset.S
wordcopy.c