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From 6518570fa9ff5c4d0a7e0c4b6788fb0f8e9ebb22 Mon Sep 17 00:00:00 2001
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From: "H.J. Lu" <hjl.tools@gmail.com>
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Date: Mon, 19 Apr 2021 07:07:21 -0700
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Subject: [PATCH] x86-64: Require BMI2 for __strlen_evex and __strnlen_evex
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Since __strlen_evex and __strnlen_evex added by
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commit 1fd8c163a83d96ace1ff78fa6bac7aee084f6f77
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Fri Mar 5 06:24:52 2021 -0800
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x86-64: Add ifunc-avx2.h functions with 256-bit EVEX
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use sarx:
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c4 e2 6a f7 c0 sarx %edx,%eax,%eax
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require BMI2 for __strlen_evex and __strnlen_evex in ifunc-impl-list.c.
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ifunc-avx2.h already requires BMI2 for EVEX implementation.
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(cherry picked from commit 55bf411b451c13f0fb7ff3d3bf9a820020b45df1)
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---
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sysdeps/x86_64/multiarch/ifunc-impl-list.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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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 fec384f6..cbfc1a5d 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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@@ -293,7 +293,8 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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__strlen_avx2_rtm)
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IFUNC_IMPL_ADD (array, i, strlen,
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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 (BMI2)),
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__strlen_evex)
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IFUNC_IMPL_ADD (array, i, strlen, 1, __strlen_sse2))
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@@ -308,7 +309,8 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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__strnlen_avx2_rtm)
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IFUNC_IMPL_ADD (array, i, strnlen,
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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 (BMI2)),
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__strnlen_evex)
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IFUNC_IMPL_ADD (array, i, strnlen, 1, __strnlen_sse2))
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--
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GitLab
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