glibc/sysdeps/x86_64
Noah Goldstein 483443d321 x86/string: Fixup alignment of main loop in str{n}cmp-evex [BZ #32212]
The loop should be aligned to 32-bytes so that it can ideally run out
the DSB. This is particularly important on Skylake-Server where
deficiencies in it's DSB implementation make it prone to not being
able to run loops out of the DSB.

For example running strcmp-evex on 200Mb string:

32-byte aligned loop:
    - 43,399,578,766      idq.dsb_uops
not 32-byte aligned loop:
    - 6,060,139,704       idq.dsb_uops

This results in a 25% performance degradation for the non-aligned
version.

The fix is to just ensure the code layout is such that the loop is
aligned. (Which was previously the case but was accidentally dropped
in 84e7c46df).

NB: The fix was actually 64-byte alignment. This is because 64-byte
alignment generally produces more stable performance than 32-byte
aligned code (cache line crosses can affect perf), so if we are going
past 16-byte alignmnent, might as well go to 64. 64-byte alignment
also matches most other functions we over-align, so it creates a
common point of optimization.

Times are reported as ratio of Time_With_Patch /
Time_Without_Patch. Lower is better.

The values being reported is the geometric mean of the ratio across
all tests in bench-strcmp and bench-strncmp.

Note this patch is only attempting to improve the Skylake-Server
strcmp for long strings. The rest of the numbers are only to test for
regressions.

Tigerlake Results Strings <= 512:
    strcmp : 1.026
    strncmp: 0.949

Tigerlake Results Strings > 512:
    strcmp : 0.994
    strncmp: 0.998

Skylake-Server Results Strings <= 512:
    strcmp : 0.945
    strncmp: 0.943

Skylake-Server Results Strings > 512:
    strcmp : 0.778
    strncmp: 1.000

The 2.6% regression on TGL-strcmp is due to slowdowns caused by
changes in alignment of code handling small sizes (most on the
page-cross logic). These should be safe to ignore because 1) We
previously only 16-byte aligned the function so this behavior is not
new and was essentially up to chance before this patch and 2) this
type of alignment related regression on small sizes really only comes
up in tight micro-benchmark loops and is unlikely to have any affect
on realworld performance.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
2024-09-30 07:40:40 -07:00
..
64 Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fpu added inputs giving large errors on x86_64 for new C23 functions 2024-08-07 14:28:46 +02:00
htl Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
multiarch x86/string: Fixup alignment of main loop in str{n}cmp-evex [BZ #32212] 2024-09-30 07:40:40 -07:00
nptl nptl: Fix Race conditions in pthread cancellation [BZ#12683] 2024-08-23 14:27:43 -03:00
sys Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
x32 x86-64: Remove sysdeps/x86_64/x32/dl-machine.h 2024-07-25 00:17:21 -07:00
____longjmp_chk.S
__longjmp.S x86-64/cet: Check the restore token in longjmp 2024-01-04 13:38:26 -08:00
_mcount.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
abort-instr.h
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configure Convert to autoconf 2.72 (vanilla release, no distribution patches) 2024-06-17 21:15:28 +02:00
configure.ac x86-64: Exclude FMA4 IFUNC functions for -mapxf 2024-04-06 05:03:55 -07:00
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dl-machine.h x86-64: Remove sysdeps/x86_64/x32/dl-machine.h 2024-07-25 00:17:21 -07:00
dl-plt-rewrite.h x86-64: Check if mprotect works before rewriting PLT 2024-01-15 06:59:23 -08:00
dl-procinfo.c x86: Update _dl_tlsdesc_dynamic to preserve caller-saved registers 2024-02-28 09:02:56 -08:00
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dl-tlsdesc.S x86-64: Don't use SSE resolvers for ISA level 3 or above 2024-02-28 11:49:30 -08:00
dl-trampoline-save.h x86: Update _dl_tlsdesc_dynamic to preserve caller-saved registers 2024-02-28 09:02:56 -08:00
dl-trampoline-state.h x86: Update _dl_tlsdesc_dynamic to preserve caller-saved registers 2024-02-28 09:02:56 -08:00
dl-trampoline.h x86: Update _dl_tlsdesc_dynamic to preserve caller-saved registers 2024-02-28 09:02:56 -08:00
dl-trampoline.S x86: Update _dl_tlsdesc_dynamic to preserve caller-saved registers 2024-02-28 09:02:56 -08:00
feature-control.h i386: Remove CET support bits 2024-01-10 05:20:20 -08:00
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l10nflist.c
ldsodefs.h i386: Remove CET support bits 2024-01-10 05:20:20 -08:00
libc-start.h x86: Move x86-64 shadow stack startup codes 2024-01-10 05:19:32 -08:00
link_map.h elf: Add ELF_DYNAMIC_AFTER_RELOC to rewrite PLT 2024-01-05 05:49:49 -08:00
link-defines.sym elf: Remove Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) 2021-10-11 11:14:02 -07:00
locale-defines.sym
localplt.data elf: Rework exception handling in the dynamic loader [BZ #25486] 2022-11-03 09:39:31 +01:00
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Makefile Revert "x86_64: Suppress false positive valgrind error" 2024-04-13 17:42:13 +02:00
math-use-builtins-ffs.h string: Use builtins for ffs and ffsll 2024-02-01 09:31:33 -03:00
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memcpy_chk.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
memcpy.S x86_64: Fix build with --disable-multiarch (BZ 30721) 2023-08-10 10:29:29 -03:00
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mp_clz_tab.c
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preconfigure configure: Use autoconf 2.71 2023-07-17 10:08:10 -04:00
preconfigure.ac rename configure.in to configure.ac 2013-10-30 17:32:08 +10:00
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rtld-offsets.sym x86-64: Align the stack in __tls_get_addr [BZ #21609] 2017-07-06 04:43:20 -07:00
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stackguard-macros.h BZ #15754: CVE-2013-4788 2013-09-23 00:52:09 -04:00
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strcasecmp_l-nonascii.c Use locale_t, not __locale_t, throughout glibc 2017-06-20 20:30:06 -04:00
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strcasecmp.S
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strncase.S
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submul_1.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
sysdep.h i386: Remove CET support 2024-01-09 13:55:51 -03:00
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tlsdesc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tlsdesc.sym x86-64: Align the stack in __tls_get_addr [BZ #21609] 2017-07-06 04:43:20 -07:00
tst-audit3.c Modify several tests to use test-skeleton.c 2014-11-05 15:24:08 +05:30
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tst-auditmod3b.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-auditmod4a.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod4b.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-auditmod5a.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod5b.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-auditmod6a.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod6b.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-auditmod6c.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
tst-auditmod7a.c Move x86_64-specific audit tests to sysdeps/x86_64/. 2013-04-25 19:23:11 +00:00
tst-auditmod7b.c Add missing header files throughout the testsuite. 2017-02-16 17:33:18 -05:00
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tst-avx512mod.c x86-64: Verify that _dl_runtime_resolve preserves vector registers 2017-02-09 12:19:58 -08:00
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tst-avxmod.c x86-64: Verify that _dl_runtime_resolve preserves vector registers 2017-02-09 12:19:58 -08:00
tst-cet-legacy-1.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-1a.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-2.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-2a.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-3.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-4.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-4a.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-4b.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-4c.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-5.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-5a.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-5b.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-6.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-6a.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-6b.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-7.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-8.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-9-static.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-9.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-10-static.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-10.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-10a-static.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-10a.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
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tst-cet-legacy-mod-2.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-mod-4.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-mod-5.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-mod-5a.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-mod-5b.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-mod-5c.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-mod-6.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-mod-6a.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-mod-6b.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-cet-legacy-mod-6c.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
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tst-glibc-hwcaps.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-gnu2-tls2mod1.S x86-64: Allocate state buffer space for RDI, RSI and RBX 2024-03-18 19:45:13 -07:00
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tst-plt-rewrite1.c elf: Add ELF_DYNAMIC_AFTER_RELOC to rewrite PLT 2024-01-05 05:49:49 -08:00
tst-plt-rewrite2.c x32: Handle displacement overflow in PLT rewrite [BZ #31218] 2024-01-06 14:25:49 -08:00
tst-plt-rewritemod1.c elf: Add ELF_DYNAMIC_AFTER_RELOC to rewrite PLT 2024-01-05 05:49:49 -08:00
tst-plt-rewritemod2.c x32: Handle displacement overflow in PLT rewrite [BZ #31218] 2024-01-06 14:25:49 -08:00
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tst-quad1pie.c
tst-quad2.c
tst-quad2pie.c
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tst-quadmod1pie.S
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tst-quadmod2pie.S
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tst-shstk-legacy-1-extra.S x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1a-static.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1a.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1b-static.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1b.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1c-static.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1c.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1d-static.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1d.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1e-static.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1e-static.sh x86/cet: fix shadow stack test scripts 2024-02-12 06:49:57 -08:00
tst-shstk-legacy-1e.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1e.sh x86/cet: fix shadow stack test scripts 2024-02-12 06:49:57 -08:00
tst-shstk-legacy-1f.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1g.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-shstk-legacy-1g.sh x86/cet: fix shadow stack test scripts 2024-02-12 06:49:57 -08:00
tst-shstk-legacy-mod-1.c x86: Move CET infrastructure to x86_64 2024-01-09 13:55:51 -03:00
tst-split-dynreloc.c Fix dynamic linker issue with bind-now 2015-08-19 05:37:01 -07:00
tst-split-dynreloc.lds Fix dynamic linker issue with bind-now 2015-08-19 05:37:01 -07:00
tst-sse.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-ssemod.c x86-64: Verify that _dl_runtime_resolve preserves vector registers 2017-02-09 12:19:58 -08:00
varshift.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
Versions Move __fentry__ version definition to sysdeps/{i386,x86_64} 2018-08-10 09:07:44 +02:00
wcpcpy-generic.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcpcpy.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcpncpy-generic.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcpncpy.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcscat-generic.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcscat.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcschr.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcscmp.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcscpy-generic.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcscpy.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcslen.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcsncat-generic.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcsncat.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcsncmp-generic.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcsncmp.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcsncpy-generic.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcsncpy.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcsnlen-generic.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcsnlen.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wcsrchr.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wmemchr.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wmemcmp.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wmemset_chk.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wmemset.S x86-64: Optimize wmemset with SSE2/AVX2/AVX512 2017-06-05 11:09:59 -07:00
wordcopy.c X86-64: Add dummy memcopy.h and wordcopy.c 2016-06-09 04:38:34 -07:00
x86-lp_size.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00