From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 7861) id CA56E3858D1E; Tue, 20 Dec 2022 04:59:18 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CA56E3858D1E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1671512358; bh=FwQ14gR8IwcHgPHNpXNZ/b3Qztd2HQuncH4nlHoeegw=; h=From:To:Subject:Date:From; b=nwqYAYXg1WejXNJKB1M1+KaAeduJJuOAPdQ7I9NQue4rbN7GICr8WirKYU/pLslHI UxwWDofmaEV3rr8OC4D/dQNZ2tX6AbtdOzpwz6Ws8ukbxuqSGhcv88VQcDhsCrfBU/ m7uJzNSc9cq/b1v0DANkr4dkbDv8ls+Z4IQXxt14= MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Hongyu Wang To: gcc-cvs@gcc.gnu.org Subject: [gcc r12-9000] i386: Avoid fma_chain for -march=alderlake and sapphirerapids. X-Act-Checkin: gcc X-Git-Author: Hongyu Wang X-Git-Refname: refs/heads/releases/gcc-12 X-Git-Oldrev: 77788d02944108f32a22815abadd7267bc6b53af X-Git-Newrev: 8ac76d504ee1216ebffab08463a544d691d85112 Message-Id: <20221220045918.CA56E3858D1E@sourceware.org> Date: Tue, 20 Dec 2022 04:59:18 +0000 (GMT) List-Id: https://gcc.gnu.org/g:8ac76d504ee1216ebffab08463a544d691d85112 commit r12-9000-g8ac76d504ee1216ebffab08463a544d691d85112 Author: Hongyu Wang Date: Tue Dec 6 09:53:35 2022 +0800 i386: Avoid fma_chain for -march=alderlake and sapphirerapids. For Alderlake there is similar issue like PR81616, enable avoid_fma256_chain will also benefit on Intel latest platforms Alderlake and Sapphire Rapids. gcc/ChangeLog: * config/i386/x86-tune.def (X86_TUNE_AVOID_256FMA_CHAINS): Add m_SAPPHIRERAPIDS, m_ALDERLAKE. Diff: --- gcc/config/i386/x86-tune.def | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/gcc/config/i386/x86-tune.def b/gcc/config/i386/x86-tune.def index d983e2f6213..1e1b206a71c 100644 --- a/gcc/config/i386/x86-tune.def +++ b/gcc/config/i386/x86-tune.def @@ -485,7 +485,8 @@ DEF_TUNE (X86_TUNE_AVOID_128FMA_CHAINS, "avoid_fma_chains", m_ZNVER) /* X86_TUNE_AVOID_256FMA_CHAINS: Avoid creating loops with tight 256bit or smaller FMA chain. */ -DEF_TUNE (X86_TUNE_AVOID_256FMA_CHAINS, "avoid_fma256_chains", m_ZNVER2 | m_ZNVER3) +DEF_TUNE (X86_TUNE_AVOID_256FMA_CHAINS, "avoid_fma256_chains", m_ZNVER2 | m_ZNVER3 + | m_ALDERLAKE | m_SAPPHIRERAPIDS) /* X86_TUNE_V2DF_REDUCTION_PREFER_PHADDPD: Prefer haddpd for v2df vector reduction. */