{"id":2230104,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230104/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/patch/20260429082030.310472-2-xiejiamei@hygon.cn/","project":{"id":41,"url":"http://patchwork.ozlabs.org/api/1.1/projects/41/?format=json","name":"GNU C Library","link_name":"glibc","list_id":"libc-alpha.sourceware.org","list_email":"libc-alpha@sourceware.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260429082030.310472-2-xiejiamei@hygon.cn>","date":"2026-04-29T08:20:30","name":"[v1,1/1] x86: Enable Prefer_No_AVX512 for Hygon model 0x8","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"9543220bd5577c6ad5c98ff72154a5b717f98cad","submitter":{"id":91872,"url":"http://patchwork.ozlabs.org/api/1.1/people/91872/?format=json","name":"Jiamei Xie","email":"xiejiamei@hygon.cn"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/glibc/patch/20260429082030.310472-2-xiejiamei@hygon.cn/mbox/","series":[{"id":502016,"url":"http://patchwork.ozlabs.org/api/1.1/series/502016/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/list/?series=502016","date":"2026-04-29T08:20:30","name":"[v1,1/1] x86: Enable Prefer_No_AVX512 for Hygon model 0x8","version":1,"mbox":"http://patchwork.ozlabs.org/series/502016/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2230104/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230104/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","libc-alpha@sourceware.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","libc-alpha@sourceware.org"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; 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a=rsa-sha256; d=sourceware.org; s=key;\n t=1777450866; c=relaxed/simple;\n bh=jge1RyABRYeKFSJHwAsC7mn7I9aevBe78cwPVk1re1Q=;\n h=From:To:Subject:Date:Message-ID:MIME-Version;\n b=eqJIesZyBkyNNDvqRw30t6M38WO7uVJbWjiFhu5MDAO8vCQmWQso3TvQ5vxXPHhBjNw3roXIqz05ESVEWTI/qbrdG7Pdm1CkHXCIj4Si6HEpWjLwruC7mf+6dDBnT937hIT0TDBKcJcPeLqcMm5GMENznk9n2b4yeL5sItl8RNI=","ARC-Authentication-Results":"i=1; server2.sourceware.org","From":"Jiamei Xie ","To":"","CC":", ","Subject":"[PATCH v1 1/1] x86: Enable Prefer_No_AVX512 for Hygon model 0x8","Date":"Wed, 29 Apr 2026 08:20:30 +0000","Message-ID":"<20260429082030.310472-2-xiejiamei@hygon.cn>","X-Mailer":"git-send-email 2.43.0","In-Reply-To":"<20260429082030.310472-1-xiejiamei@hygon.cn>","References":"<20260429082030.310472-1-xiejiamei@hygon.cn>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-Originating-IP":"[172.19.22.176]","X-ClientProxiedBy":"cncheex05.Hygon.cn (172.23.18.115) To cncheex04.Hygon.cn\n (172.23.18.114)","X-BeenThere":"libc-alpha@sourceware.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Libc-alpha mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org"},"content":"From: xiejiamei \n\nExtend the Prefer_No_AVX512 tuning to cover Hygon model 0x8.\n\nBenchmarks on Hygon platforms show that EVEX implementations\nare often more profitable than AVX512 paths. The existing logic\nalready enables Prefer_No_AVX512 for model 0x7. Apply the same\npreference to model 0x8 to ensure consistent IFUNC selection\nbehavior across newer Hygon processors.\n\nSigned-off-by: xiejiamei \n---\n sysdeps/x86/cpu-features.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)","diff":"diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c\nindex 73ee4f2bb8..a453136827 100644\n--- a/sysdeps/x86/cpu-features.c\n+++ b/sysdeps/x86/cpu-features.c\n@@ -1135,7 +1135,7 @@ disable_tsx:\n \t cpu_features->preferred[index_arch_AVX_Fast_Unaligned_Load]\n \t &= ~bit_arch_AVX_Fast_Unaligned_Load;\n \t}\n- else if (model == 0x7)\n+ else if (model == 0x7 || model == 0x8)\n \t{\n \t /* Benchmarks indicate evex can be more profitable on Hygon\n \t hardware than AVX512. */\n","prefixes":["v1","1/1"]}