Enable automatic detection of FMA3 support to allow intrinsics to be used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157805 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index 962364b..3b60be5 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -205,12 +205,10 @@
HasPCLMUL = true;
ToggleFeature(X86::FeaturePCLMUL);
}
- // FMA3 autodetection is switched off until we have a special flag
- // in code generator
- //if ((ECX >> 12) & 0x1) {
- // HasFMA3 = true;
- // ToggleFeature(X86::FeatureFMA3);
- //}
+ if ((ECX >> 12) & 0x1) {
+ HasFMA3 = true;
+ ToggleFeature(X86::FeatureFMA3);
+ }
if (IsIntel && ((ECX >> 22) & 0x1)) {
HasMOVBE = true;
ToggleFeature(X86::FeatureMOVBE);