[llvm-branch-commits] [llvm] fac122a - [X86][Driver] Do not add `-evex512` for `-march=native` when the target doesn't support AVX512 (#91694)

[Tom Stellard via llvm-branch-commits]

Author: Phoebe Wang
Date: 2024-05-14T16:26:16-07:00
New Revision: fac122ac439191d5f46da6400681c54b0bf7e3db

URL: https://github.com/llvm/llvm-project/commit/fac122ac439191d5f46da6400681c54b0bf7e3db
DIFF: https://github.com/llvm/llvm-project/commit/fac122ac439191d5f46da6400681c54b0bf7e3db.diff

LOG: [X86][Driver] Do not add `-evex512` for `-march=native` when the target doesn't support AVX512 (#91694)

(cherry picked from commit 87f3407856e61a73798af4e41b28bc33b5bf4ce6)

Added: 
    

Modified: 
    llvm/lib/TargetParser/Host.cpp

Removed: 
    


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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);