[gcc r12-9000] i386: Avoid fma_chain for -march=alderlake and sapphirerapids.

[gcc r12-9000] i386: Avoid fma_chain for -march=alderlake and sapphirerapids.

[Hongyu Wang]

https://gcc.gnu.org/g:8ac76d504ee1216ebffab08463a544d691d85112

commit r12-9000-g8ac76d504ee1216ebffab08463a544d691d85112
Author: Hongyu Wang <hongyu.wang@intel.com>
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.  */