From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from hall.aurel32.net (hall.aurel32.net [IPv6:2001:bc8:30d7:100::1]) by sourceware.org (Postfix) with ESMTPS id 6FCF2385482D for ; Mon, 3 Oct 2022 21:56:19 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 6FCF2385482D Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=aurel32.net Authentication-Results: sourceware.org; spf=none smtp.mailfrom=aurel32.net DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=aurel32.net ; s=202004.hall; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Content-Type:From:Reply-To: Subject:Content-ID:Content-Description:X-Debbugs-Cc; bh=6RcSBB2d9av3G+GLby6a+WeNnNCRYSKt2iozviw6m+I=; b=s1E0HOU4iwo812A2Zm/XxCe/Fk KLiwmTSvwkdkebYBo99f0W2WCfZPOjli6jD0485yNm0ldCXYGcjuTeFEblAzWC8XQ6MwGjPKzxMDN HxhbTDmixgnLztqkZJ+1vJvK++Tujq0WlUQGT//vbdcPgDEwillBvwBLrN6tYzxpt4friJuZ805r8 rCyS9OIRCxPVZPSN7Zq5UGpEblt5KCK2EvkFvmIIM7R50+7VQ6UF2wJ43LlGxl1RQmwwlOWIaCGJb a/3DcrhXXMVkQ2Vsn3vFjFOiAqFU7jW1CCin69b6PPGsPrSrp6i6DBEgG3Wq8qMf5vDt5nk/qEcn3 o/Fv0mIA==; Received: from [2a01:e34:ec5d:a741:8a4c:7c4e:dc4c:1787] (helo=ohm.rr44.fr) by hall.aurel32.net with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ofTQ9-00GL4V-UO; Mon, 03 Oct 2022 23:56:17 +0200 Received: from aurel32 by ohm.rr44.fr with local (Exim 4.96) (envelope-from ) id 1ofTQ8-00DozR-2u; Mon, 03 Oct 2022 23:56:16 +0200 From: Aurelien Jarno To: libc-stable@sourceware.org Cc: Aurelien Jarno , Noah Goldstein Subject: [COMMITTED 2.35 6/8] x86-64: Require BMI2 for AVX2 (raw|w)memchr implementations Date: Mon, 3 Oct 2022 23:56:12 +0200 Message-Id: <20221003215614.3294221-6-aurelien@aurel32.net> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221003215614.3294221-1-aurelien@aurel32.net> References: <20221003215614.3294221-1-aurelien@aurel32.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-13.2 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,SPF_HELO_PASS,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: The AVX2 memchr, rawmemchr and wmemchr implementations use the 'bzhi' and 'sarx' instructions, which belongs to the BMI2 CPU feature. Fixes: acfd088a1963 ("x86: Optimize memchr-avx2.S") Partially resolves: BZ #29611 Reviewed-by: Noah Goldstein (cherry picked from commit e3e7fab7fe5186d18ca2046d99ba321c27db30ad) --- sysdeps/x86_64/multiarch/ifunc-impl-list.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c index 5824554b4e..9959f7b228 100644 --- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c +++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c @@ -59,10 +59,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/memchr.c. */ IFUNC_IMPL (i, name, memchr, IFUNC_IMPL_ADD (array, i, memchr, - CPU_FEATURE_USABLE (AVX2), + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2)), __memchr_avx2) IFUNC_IMPL_ADD (array, i, memchr, (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) && CPU_FEATURE_USABLE (RTM)), __memchr_avx2_rtm) IFUNC_IMPL_ADD (array, i, memchr, @@ -301,10 +303,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/rawmemchr.c. */ IFUNC_IMPL (i, name, rawmemchr, IFUNC_IMPL_ADD (array, i, rawmemchr, - CPU_FEATURE_USABLE (AVX2), + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2)), __rawmemchr_avx2) IFUNC_IMPL_ADD (array, i, rawmemchr, (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) && CPU_FEATURE_USABLE (RTM)), __rawmemchr_avx2_rtm) IFUNC_IMPL_ADD (array, i, rawmemchr, @@ -805,10 +809,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/wmemchr.c. */ IFUNC_IMPL (i, name, wmemchr, IFUNC_IMPL_ADD (array, i, wmemchr, - CPU_FEATURE_USABLE (AVX2), + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2)), __wmemchr_avx2) IFUNC_IMPL_ADD (array, i, wmemchr, (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) && CPU_FEATURE_USABLE (RTM)), __wmemchr_avx2_rtm) IFUNC_IMPL_ADD (array, i, wmemchr, -- 2.35.1