73667d0be6
* Thu Apr 28 2022 Carlos O'Donell <carlos@redhat.com> - 2.34-32 - Sync with upstream branch release/2.34/master, commit c66c92181ddbd82306537a608e8c0282587131de: - posix/glob.c: update from gnulib (BZ#25659) - linux: Fix fchmodat with AT_SYMLINK_NOFOLLOW for 64 bit time_t (BZ#29097) * Wed Apr 27 2022 Carlos O'Donell <carlos@redhat.com> - 2.34-31 - Sync with upstream branch release/2.34/master, commit 55640ed3fde48360a8e8083be4843bd2dc7cecfe: - i386: Regenerate ulps - linux: Fix missing internal 64 bit time_t stat usage - x86: Optimize L(less_vec) case in memcmp-evex-movbe.S - x86: Don't set Prefer_No_AVX512 for processors with AVX512 and AVX-VNNI - x86-64: Use notl in EVEX strcmp [BZ #28646] - x86: Shrink memcmp-sse4.S code size - x86: Double size of ERMS rep_movsb_threshold in dl-cacheinfo.h - x86: Optimize memmove-vec-unaligned-erms.S - x86-64: Replace movzx with movzbl - x86-64: Remove Prefer_AVX2_STRCMP - x86-64: Improve EVEX strcmp with masked load - x86: Replace sse2 instructions with avx in memcmp-evex-movbe.S - x86: Optimize memset-vec-unaligned-erms.S - x86: Optimize memcmp-evex-movbe.S for frontend behavior and size - x86: Modify ENTRY in sysdep.h so that p2align can be specified - x86-64: Optimize load of all bits set into ZMM register [BZ #28252] - scripts/glibcelf.py: Mark as UNSUPPORTED on Python 3.5 and earlier - dlfcn: Do not use rtld_active () to determine ld.so state (bug 29078) - INSTALL: Rephrase -with-default-link documentation - misc: Fix rare fortify crash on wchar funcs. [BZ 29030] - Default to --with-default-link=no (bug 25812) - scripts: Add glibcelf.py module * Thu Apr 21 2022 Carlos O'Donell <carlos@redhat.com> - 2.34-30 - Sync with upstream branch release/2.34/master, commit 71326f1f2fd09dafb9c34404765fb88129e94237: - nptl: Fix pthread_cancel cancelhandling atomic operations - mips: Fix mips64n32 64 bit time_t stat support (BZ#29069) - hurd: Fix arbitrary error code - nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029) - S390: Add new s390 platform z16. - NEWS: Update fixed bug list for LD_AUDIT backports. - hppa: Fix bind-now audit (BZ #28857) - elf: Replace tst-audit24bmod2.so with tst-audit24bmod2 - Fix elf/tst-audit25a with default bind now toolchains - elf: Fix runtime linker auditing on aarch64 (BZ #26643) - elf: Issue la_symbind for bind-now (BZ #23734) - elf: Fix initial-exec TLS access on audit modules (BZ #28096) - elf: Add la_activity during application exit - elf: Do not fail for failed dlmopen on audit modules (BZ #28061) - elf: Issue audit la_objopen for vDSO - elf: Add audit tests for modules with TLSDESC - elf: Avoid unnecessary slowdown from profiling with audit (BZ#15533) - elf: Add _dl_audit_pltexit - elf: Add _dl_audit_pltenter - elf: Add _dl_audit_preinit - elf: Add _dl_audit_symbind_alt and _dl_audit_symbind - elf: Add _dl_audit_objclose - elf: Add _dl_audit_objsearch - elf: Add _dl_audit_activity_map and _dl_audit_activity_nsid - elf: Add _dl_audit_objopen - elf: Move la_activity (LA_ACT_ADD) after _dl_add_to_namespace_list() (BZ #28062) - elf: Move LAV_CURRENT to link_lavcurrent.h - elf: Fix elf_get_dynamic_info() for bootstrap - elf: Fix dynamic-link.h usage on rtld.c - elf: Fix elf_get_dynamic_info definition - elf: Avoid nested functions in the loader [BZ #27220] - powerpc: Delete unneeded ELF_MACHINE_BEFORE_RTLD_RELOC - hppa: Use END instead of PSEUDO_END in swapcontext.S - hppa: Implement swapcontext in assembler (bug 28960) Resolves: #2003291 Resolves: #2064181 Resolves: #2072328 Resolves: #2075713 Resolves: #2077838
86 lines
3.7 KiB
Diff
86 lines
3.7 KiB
Diff
commit a182bb7a3922404f79def09d79ef89678b4049f0
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Fri Oct 29 12:56:53 2021 -0700
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x86-64: Remove Prefer_AVX2_STRCMP
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Remove Prefer_AVX2_STRCMP to enable EVEX strcmp. When comparing 2 32-byte
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strings, EVEX strcmp has been improved to require 1 load, 1 VPTESTM, 1
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VPCMP, 1 KMOVD and 1 INCL instead of 2 loads, 3 VPCMPs, 2 KORDs, 1 KMOVD
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and 1 TESTL while AVX2 strcmp requires 1 load, 2 VPCMPEQs, 1 VPMINU, 1
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VPMOVMSKB and 1 TESTL. EVEX strcmp is now faster than AVX2 strcmp by up
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to 40% on Tiger Lake and Ice Lake.
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(cherry picked from commit 14dbbf46a007ae5df36646b51ad0c9e5f5259f30)
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diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
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index de4e3c3b7258120d..f4d4049e391cbabd 100644
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--- a/sysdeps/x86/cpu-features.c
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+++ b/sysdeps/x86/cpu-features.c
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@@ -574,14 +574,6 @@ disable_tsx:
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if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
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cpu_features->preferred[index_arch_Prefer_No_VZEROUPPER]
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|= bit_arch_Prefer_No_VZEROUPPER;
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-
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- /* Since to compare 2 32-byte strings, 256-bit EVEX strcmp
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- requires 2 loads, 3 VPCMPs and 2 KORDs while AVX2 strcmp
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- requires 1 load, 2 VPCMPEQs, 1 VPMINU and 1 VPMOVMSKB,
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- AVX2 strcmp is faster than EVEX strcmp. */
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- if (CPU_FEATURE_USABLE_P (cpu_features, AVX2))
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- cpu_features->preferred[index_arch_Prefer_AVX2_STRCMP]
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- |= bit_arch_Prefer_AVX2_STRCMP;
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}
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/* Avoid avoid short distance REP MOVSB on processor with FSRM. */
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diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c
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index 58f2fad4323d5d91..957db3ad229ba39f 100644
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--- a/sysdeps/x86/cpu-tunables.c
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+++ b/sysdeps/x86/cpu-tunables.c
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@@ -239,8 +239,6 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp)
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CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features,
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Fast_Copy_Backward,
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disable, 18);
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- CHECK_GLIBC_IFUNC_PREFERRED_NEED_BOTH
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- (n, cpu_features, Prefer_AVX2_STRCMP, AVX2, disable, 18);
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}
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break;
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case 19:
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diff --git a/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def b/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def
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index 3bdc76cf71007948..8250bfcbecd29a9f 100644
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--- a/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def
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+++ b/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def
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@@ -31,5 +31,4 @@ BIT (Prefer_ERMS)
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BIT (Prefer_No_AVX512)
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BIT (MathVec_Prefer_No_AVX512)
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BIT (Prefer_FSRM)
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-BIT (Prefer_AVX2_STRCMP)
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BIT (Avoid_Short_Distance_REP_MOVSB)
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diff --git a/sysdeps/x86_64/multiarch/strcmp.c b/sysdeps/x86_64/multiarch/strcmp.c
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index 62b7abeeee646ab4..7c2901bf44456259 100644
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--- a/sysdeps/x86_64/multiarch/strcmp.c
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+++ b/sysdeps/x86_64/multiarch/strcmp.c
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@@ -43,8 +43,7 @@ IFUNC_SELECTOR (void)
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{
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if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
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- && CPU_FEATURE_USABLE_P (cpu_features, BMI2)
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- && !CPU_FEATURES_ARCH_P (cpu_features, Prefer_AVX2_STRCMP))
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+ && CPU_FEATURE_USABLE_P (cpu_features, BMI2))
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return OPTIMIZE (evex);
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if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
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diff --git a/sysdeps/x86_64/multiarch/strncmp.c b/sysdeps/x86_64/multiarch/strncmp.c
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index 60ba0fe356b31779..f94a421784bfe923 100644
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--- a/sysdeps/x86_64/multiarch/strncmp.c
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+++ b/sysdeps/x86_64/multiarch/strncmp.c
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@@ -43,8 +43,7 @@ IFUNC_SELECTOR (void)
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{
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if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
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- && CPU_FEATURE_USABLE_P (cpu_features, BMI2)
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- && !CPU_FEATURES_ARCH_P (cpu_features, Prefer_AVX2_STRCMP))
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+ && CPU_FEATURE_USABLE_P (cpu_features, BMI2))
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return OPTIMIZE (evex);
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if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
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