https://github.com/llvmbot created
https://github.com/llvm/llvm-project/pull/91705
Backport 87f3407856e61a73798af4e41b28bc33b5bf4ce6
Requested by: @phoebewang
>From dc1713855159bbc14e6387fb57d8065037f92145 Mon Sep 17 00:00:00 2001
From: Phoebe Wang <phoebe.w...@intel.com>
Date: Fri, 10 May 2024 13:25:37 +0800
Subject: [PATCH] [X86][Driver] Do not add `-evex512` for `-march=native` when
the target doesn't support AVX512 (#91694)
(cherry picked from commit 87f3407856e61a73798af4e41b28bc33b5bf4ce6)
---
llvm/lib/TargetParser/Host.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/llvm/lib/TargetParser/Host.cpp b/llvm/lib/TargetParser/Host.cpp
index 1adef15771fa1..848b531dd8dd9 100644
--- a/llvm/lib/TargetParser/Host.cpp
+++ b/llvm/lib/TargetParser/Host.cpp
@@ -1774,7 +1774,8 @@ bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
Features["rtm"] = HasLeaf7 && ((EBX >> 11) & 1);
// AVX512 is only supported if the OS supports the context save for it.
Features["avx512f"] = HasLeaf7 && ((EBX >> 16) & 1) && HasAVX512Save;
- Features["evex512"] = Features["avx512f"];
+ if (Features["avx512f"])
+ Features["evex512"] = true;
Features["avx512dq"] = HasLeaf7 && ((EBX >> 17) & 1) && HasAVX512Save;
Features["rdseed"] = HasLeaf7 && ((EBX >> 18) & 1);
Features["adx"] = HasLeaf7 && ((EBX >> 19) & 1);
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