Add support for generating CMPXCHG16B on x86-64 for the cmpxchg IR instruction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138660 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index 5e6c659..be77d87 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -203,6 +203,7 @@
HasFMA3 = IsIntel && ((ECX >> 12) & 0x1); ToggleFeature(X86::FeatureFMA3);
HasPOPCNT = IsIntel && ((ECX >> 23) & 0x1); ToggleFeature(X86::FeaturePOPCNT);
HasAES = IsIntel && ((ECX >> 25) & 0x1); ToggleFeature(X86::FeatureAES);
+ HasCmpxchg16b = ((ECX >> 13) & 0x1); ToggleFeature(X86::FeatureCMPXCHG16B);
if (IsIntel || IsAMD) {
// Determine if bit test memory instructions are slow.
@@ -254,6 +255,7 @@
, IsBTMemSlow(false)
, IsUAMemFast(false)
, HasVectorUAMem(false)
+ , HasCmpxchg16b(false)
, stackAlignment(8)
// FIXME: this is a known good value for Yonah. How about others?
, MaxInlineSizeThreshold(128)