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From: H.J. Lu <hjl@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/release/2.32/master] x86-64: Require BMI2 for __strlen_evex and __strnlen_evex
Date: Thu, 27 Jan 2022 23:51:23 +0000 (GMT)	[thread overview]
Message-ID: <20220127235123.1DDE23858430@sourceware.org> (raw)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f996f678b908a4a0e73816da89d47869e50c370f

commit f996f678b908a4a0e73816da89d47869e50c370f
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Apr 19 07:07:21 2021 -0700

    x86-64: Require BMI2 for __strlen_evex and __strnlen_evex
    
    Since __strlen_evex and __strnlen_evex added by
    
    commit 1fd8c163a83d96ace1ff78fa6bac7aee084f6f77
    Author: H.J. Lu <hjl.tools@gmail.com>
    Date:   Fri Mar 5 06:24:52 2021 -0800
    
        x86-64: Add ifunc-avx2.h functions with 256-bit EVEX
    
    use sarx:
    
    c4 e2 6a f7 c0          sarx   %edx,%eax,%eax
    
    require BMI2 for __strlen_evex and __strnlen_evex in ifunc-impl-list.c.
    ifunc-avx2.h already requires BMI2 for EVEX implementation.
    
    (cherry picked from commit 55bf411b451c13f0fb7ff3d3bf9a820020b45df1)

Diff:
---
 sysdeps/x86_64/multiarch/ifunc-impl-list.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
index 11e9e25820..e5af769869 100644
--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
@@ -295,7 +295,8 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __strlen_avx2_rtm)
 	      IFUNC_IMPL_ADD (array, i, strlen,
 			      (CPU_FEATURE_USABLE (AVX512VL)
-			       && CPU_FEATURE_USABLE (AVX512BW)),
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
 			      __strlen_evex)
 	      IFUNC_IMPL_ADD (array, i, strlen, 1, __strlen_sse2))
 
@@ -312,7 +313,8 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __strnlen_avx2_rtm)
 	      IFUNC_IMPL_ADD (array, i, strnlen,
 			      (CPU_FEATURE_USABLE (AVX512VL)
-			       && CPU_FEATURE_USABLE (AVX512BW)),
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
 			      __strnlen_evex)
 	      IFUNC_IMPL_ADD (array, i, strnlen, 1, __strnlen_sse2))


                 reply	other threads:[~2022-01-27 23:51 UTC|newest]

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