forked from rpms/glibc
e43852d149
* Thu Oct 13 2022 Arjun Shankar <arjun@redhat.com> - 2.34-48 - Handle non-hostname CNAME aliases during name resolution (#2129005) - Sync with upstream branch release/2.34/master, commit e3976287b22422787f3cc6fc9adda58304b55bd9: - nscd: Drop local address tuple variable [BZ #29607] - x86-64: Require BMI1/BMI2 for AVX2 strrchr and wcsrchr implementations - x86-64: Require BMI2 and LZCNT for AVX2 memrchr implementation - x86-64: Require BMI2 for AVX2 (raw|w)memchr implementations - x86-64: Require BMI2 for AVX2 wcs(n)cmp implementations - x86-64: Require BMI2 for AVX2 strncmp implementation - x86-64: Require BMI2 for AVX2 strcmp implementation - x86-64: Require BMI2 for AVX2 str(n)casecmp implementations - x86: include BMI1 and BMI2 in x86-64-v3 level - nptl: Add backoff mechanism to spinlock loop - sysdeps: Add 'get_fast_jitter' interace in fast-jitter.h - nptl: Effectively skip CAS in spinlock loop - Move assignment out of the CAS condition - Add LLL_MUTEX_READ_LOCK [BZ #28537] - Avoid extra load with CAS in __pthread_mutex_clocklock_common [BZ #28537] - Avoid extra load with CAS in __pthread_mutex_lock_full [BZ #28537] - resolv: Fix building tst-resolv-invalid-cname for earlier C standards - nss_dns: Rewrite _nss_dns_gethostbyname4_r using current interfaces - resolv: Add new tst-resolv-invalid-cname - nss_dns: In gaih_getanswer_slice, skip strange aliases (bug 12154) (#2129005) - nss_dns: Rewrite getanswer_r to match getanswer_ptr (bug 12154, bug 29305) - nss_dns: Remove remnants of IPv6 address mapping - nss_dns: Rewrite _nss_dns_gethostbyaddr2_r and getanswer_ptr - nss_dns: Split getanswer_ptr from getanswer_r - resolv: Add DNS packet parsing helpers geared towards wire format - resolv: Add internal __ns_name_length_uncompressed function - resolv: Add the __ns_samebinaryname function - resolv: Add internal __res_binary_hnok function - resolv: Add tst-resolv-aliases - resolv: Add tst-resolv-byaddr for testing reverse lookup - gconv: Use 64-bit interfaces in gconv_parseconfdir (bug 29583) - elf: Fix hwcaps string size overestimation - nscd: Fix netlink cache invalidation if epoll is used [BZ #29415] - Apply asm redirections in wchar.h before first use - Apply asm redirections in stdio.h before first use [BZ #27087] - elf: Call __libc_early_init for reused namespaces (bug 29528) Resolves: #2129005 Resolves: #2116960
79 lines
3.3 KiB
Diff
79 lines
3.3 KiB
Diff
commit e570b865b53f33453d97160791a7d97e38bcc6e8
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Author: Aurelien Jarno <aurelien@aurel32.net>
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Date: Mon Oct 3 23:16:46 2022 +0200
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x86-64: Require BMI1/BMI2 for AVX2 strrchr and wcsrchr implementations
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The AVX2 strrchr and wcsrchr implementation uses the 'blsmsk'
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instruction which belongs to the BMI1 CPU feature and the 'shrx'
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instruction, which belongs to the BMI2 CPU feature.
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Fixes: df7e295d18ff ("x86: Optimize {str|wcs}rchr-avx2")
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Partially resolves: BZ #29611
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Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
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(cherry picked from commit 7e8283170c5d6805b609a040801d819e362a6292)
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diff --git a/sysdeps/x86_64/multiarch/ifunc-avx2.h b/sysdeps/x86_64/multiarch/ifunc-avx2.h
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index 52bd00ea5cab6b22..877f007dd6e38fe8 100644
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--- a/sysdeps/x86_64/multiarch/ifunc-avx2.h
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+++ b/sysdeps/x86_64/multiarch/ifunc-avx2.h
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@@ -30,6 +30,7 @@ IFUNC_SELECTOR (void)
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const struct cpu_features* cpu_features = __get_cpu_features ();
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if (CPU_FEATURE_USABLE_P (cpu_features, AVX2)
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+ && CPU_FEATURE_USABLE_P (cpu_features, BMI1)
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&& CPU_FEATURE_USABLE_P (cpu_features, BMI2)
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&& CPU_FEATURE_USABLE_P (cpu_features, LZCNT)
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&& CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
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diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
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index d1fc1e75d6706413..84f9e73e2b7df816 100644
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--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
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+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
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@@ -498,15 +498,21 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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/* Support sysdeps/x86_64/multiarch/strrchr.c. */
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IFUNC_IMPL (i, name, strrchr,
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IFUNC_IMPL_ADD (array, i, strrchr,
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- CPU_FEATURE_USABLE (AVX2),
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+ (CPU_FEATURE_USABLE (AVX2)
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+ && CPU_FEATURE_USABLE (BMI1)
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+ && CPU_FEATURE_USABLE (BMI2)),
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__strrchr_avx2)
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IFUNC_IMPL_ADD (array, i, strrchr,
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(CPU_FEATURE_USABLE (AVX2)
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+ && CPU_FEATURE_USABLE (BMI1)
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+ && CPU_FEATURE_USABLE (BMI2)
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&& CPU_FEATURE_USABLE (RTM)),
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__strrchr_avx2_rtm)
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IFUNC_IMPL_ADD (array, i, strrchr,
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(CPU_FEATURE_USABLE (AVX512VL)
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- && CPU_FEATURE_USABLE (AVX512BW)),
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+ && CPU_FEATURE_USABLE (AVX512BW)
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+ && CPU_FEATURE_USABLE (BMI1)
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+ && CPU_FEATURE_USABLE (BMI2)),
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__strrchr_evex)
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IFUNC_IMPL_ADD (array, i, strrchr, 1, __strrchr_sse2))
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@@ -687,15 +693,20 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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/* Support sysdeps/x86_64/multiarch/wcsrchr.c. */
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IFUNC_IMPL (i, name, wcsrchr,
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IFUNC_IMPL_ADD (array, i, wcsrchr,
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- CPU_FEATURE_USABLE (AVX2),
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+ (CPU_FEATURE_USABLE (AVX2)
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+ && CPU_FEATURE_USABLE (BMI1)
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+ && CPU_FEATURE_USABLE (BMI2)),
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__wcsrchr_avx2)
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IFUNC_IMPL_ADD (array, i, wcsrchr,
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(CPU_FEATURE_USABLE (AVX2)
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+ && CPU_FEATURE_USABLE (BMI1)
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+ && CPU_FEATURE_USABLE (BMI2)
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&& CPU_FEATURE_USABLE (RTM)),
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__wcsrchr_avx2_rtm)
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IFUNC_IMPL_ADD (array, i, wcsrchr,
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(CPU_FEATURE_USABLE (AVX512VL)
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&& CPU_FEATURE_USABLE (AVX512BW)
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+ && CPU_FEATURE_USABLE (BMI1)
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&& CPU_FEATURE_USABLE (BMI2)),
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__wcsrchr_evex)
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IFUNC_IMPL_ADD (array, i, wcsrchr, 1, __wcsrchr_sse2))
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