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glibc/glibc-upstream-2.34-344.patch
Arjun Shankar e43852d149 Import glibc-2.34-48.fc35 from f35 
* 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
2022-10-14 14:22:13 +02:00

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commit e570b865b53f33453d97160791a7d97e38bcc6e8
Author: Aurelien Jarno <aurelien@aurel32.net>
Date: Mon Oct 3 23:16:46 2022 +0200
x86-64: Require BMI1/BMI2 for AVX2 strrchr and wcsrchr implementations
The AVX2 strrchr and wcsrchr implementation uses the 'blsmsk'
instruction which belongs to the BMI1 CPU feature and the 'shrx'
instruction, which belongs to the BMI2 CPU feature.
Fixes: df7e295d18ff ("x86: Optimize {str|wcs}rchr-avx2")
Partially resolves: BZ #29611
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 7e8283170c5d6805b609a040801d819e362a6292)
diff --git a/sysdeps/x86_64/multiarch/ifunc-avx2.h b/sysdeps/x86_64/multiarch/ifunc-avx2.h
index 52bd00ea5cab6b22..877f007dd6e38fe8 100644
--- a/sysdeps/x86_64/multiarch/ifunc-avx2.h
+++ b/sysdeps/x86_64/multiarch/ifunc-avx2.h
@@ -30,6 +30,7 @@ IFUNC_SELECTOR (void)
const struct cpu_features* cpu_features = __get_cpu_features ();
if (CPU_FEATURE_USABLE_P (cpu_features, AVX2)
+ && CPU_FEATURE_USABLE_P (cpu_features, BMI1)
&& CPU_FEATURE_USABLE_P (cpu_features, BMI2)
&& CPU_FEATURE_USABLE_P (cpu_features, LZCNT)
&& CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
index d1fc1e75d6706413..84f9e73e2b7df816 100644
--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
@@ -498,15 +498,21 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
/* Support sysdeps/x86_64/multiarch/strrchr.c. */
IFUNC_IMPL (i, name, strrchr,
IFUNC_IMPL_ADD (array, i, strrchr,
- CPU_FEATURE_USABLE (AVX2),
+ (CPU_FEATURE_USABLE (AVX2)
+ && CPU_FEATURE_USABLE (BMI1)
+ && CPU_FEATURE_USABLE (BMI2)),
__strrchr_avx2)
IFUNC_IMPL_ADD (array, i, strrchr,
(CPU_FEATURE_USABLE (AVX2)
+ && CPU_FEATURE_USABLE (BMI1)
+ && CPU_FEATURE_USABLE (BMI2)
&& CPU_FEATURE_USABLE (RTM)),
__strrchr_avx2_rtm)
IFUNC_IMPL_ADD (array, i, strrchr,
(CPU_FEATURE_USABLE (AVX512VL)
- && CPU_FEATURE_USABLE (AVX512BW)),
+ && CPU_FEATURE_USABLE (AVX512BW)
+ && CPU_FEATURE_USABLE (BMI1)
+ && CPU_FEATURE_USABLE (BMI2)),
__strrchr_evex)
IFUNC_IMPL_ADD (array, i, strrchr, 1, __strrchr_sse2))
@@ -687,15 +693,20 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
/* Support sysdeps/x86_64/multiarch/wcsrchr.c. */
IFUNC_IMPL (i, name, wcsrchr,
IFUNC_IMPL_ADD (array, i, wcsrchr,
- CPU_FEATURE_USABLE (AVX2),
+ (CPU_FEATURE_USABLE (AVX2)
+ && CPU_FEATURE_USABLE (BMI1)
+ && CPU_FEATURE_USABLE (BMI2)),
__wcsrchr_avx2)
IFUNC_IMPL_ADD (array, i, wcsrchr,
(CPU_FEATURE_USABLE (AVX2)
+ && CPU_FEATURE_USABLE (BMI1)
+ && CPU_FEATURE_USABLE (BMI2)
&& CPU_FEATURE_USABLE (RTM)),
__wcsrchr_avx2_rtm)
IFUNC_IMPL_ADD (array, i, wcsrchr,
(CPU_FEATURE_USABLE (AVX512VL)
&& CPU_FEATURE_USABLE (AVX512BW)
+ && CPU_FEATURE_USABLE (BMI1)
&& CPU_FEATURE_USABLE (BMI2)),
__wcsrchr_evex)
IFUNC_IMPL_ADD (array, i, wcsrchr, 1, __wcsrchr_sse2))
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