From 3a1a141f79c83ad38f7db3a21d8a4dcfe625c176 Mon Sep 17 00:00:00 2001
From: Hongyu Wang <hongyu.wang@intel.com>
Date: Tue, 6 Dec 2022 09:53:35 +0800
Subject: [PATCH] i386: Avoid fma_chain for -march=alderlake and
sapphirerapids.
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 and m_CORE_ATOM.
---
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 cd66f3351137..db85de20bae1 100644
--- a/gcc/config/i386/x86-tune.def
+++ b/gcc/config/i386/x86-tune.def
@@ -499,7 +499,8 @@ 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 | m_CORE_ATOM)
/* X86_TUNE_V2DF_REDUCTION_PREFER_PHADDPD: Prefer haddpd
for v2df vector reduction. */
--
GitLab