[X86][Driver] Do not add `-evex512` for `-march=native` when the target doesn't suppo...

(cherry picked from commit 87f3407856e61a73798af4e41b28bc33b5bf4ce6)

diff --git a/llvm/lib/TargetParser/Host.cpp b/llvm/lib/TargetParser/Host.cpp
index 1adef15771fa17414b4e6b100521c36c9de698a0..848b531dd8dd9ff694f2e04de2a1b0484be5f344 100644 (file)
--- 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);