57239231b9
For Alderlake there is similar issue like PR 81616, 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.
36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
From b7980cd8d8bcf41b3ca1b6f3ba147789d42a9b99 Mon Sep 17 00:00:00 2001
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From: Hongyu Wang <hongyu.wang@intel.com>
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Date: Tue, 6 Dec 2022 09:53:35 +0800
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Subject: [PATCH] i386: Avoid fma_chain for -march=alderlake and
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sapphirerapids.
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For Alderlake there is similar issue like PR 81616, enable
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avoid_fma256_chain will also benefit on Intel latest platforms
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Alderlake and Sapphire Rapids.
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gcc/ChangeLog:
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* config/i386/x86-tune.def (X86_TUNE_AVOID_256FMA_CHAINS): Add
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m_SAPPHIRERAPIDS, m_ALDERLAKE.
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---
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gcc/config/i386/x86-tune.def | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/gcc/config/i386/x86-tune.def b/gcc/config/i386/x86-tune.def
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index d983e2f6213..1e1b206a71c 100644
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--- a/gcc/config/i386/x86-tune.def
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+++ b/gcc/config/i386/x86-tune.def
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@@ -485,7 +485,8 @@ DEF_TUNE (X86_TUNE_AVOID_128FMA_CHAINS, "avoid_fma_chains", m_ZNVER)
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/* X86_TUNE_AVOID_256FMA_CHAINS: Avoid creating loops with tight 256bit or
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smaller FMA chain. */
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-DEF_TUNE (X86_TUNE_AVOID_256FMA_CHAINS, "avoid_fma256_chains", m_ZNVER2 | m_ZNVER3)
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+DEF_TUNE (X86_TUNE_AVOID_256FMA_CHAINS, "avoid_fma256_chains", m_ZNVER2 | m_ZNVER3
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+ | m_ALDERLAKE | m_SAPPHIRERAPIDS)
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/* X86_TUNE_V2DF_REDUCTION_PREFER_PHADDPD: Prefer haddpd
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for v2df vector reduction. */
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--
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2.18.2
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