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.h b/lib/Target/X86/X86Subtarget.h
index d5c433f..c3a6d0f 100644
--- a/lib/Target/X86/X86Subtarget.h
+++ b/lib/Target/X86/X86Subtarget.h
@@ -100,6 +100,10 @@
/// operands. This may require setting a feature bit in the processor.
bool HasVectorUAMem;
+ /// HasCmpxchg16b - True if this processor has the CMPXCHG16B instruction;
+ /// this is true for most x86-64 chips, but not the first AMD chips.
+ bool HasCmpxchg16b;
+
/// stackAlignment - The minimum alignment known to hold of the stack frame on
/// entry to the function and which must be maintained by every function.
unsigned stackAlignment;
@@ -168,6 +172,7 @@
bool isBTMemSlow() const { return IsBTMemSlow; }
bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
bool hasVectorUAMem() const { return HasVectorUAMem; }
+ bool hasCmpxchg16b() const { return HasCmpxchg16b; }
const Triple &getTargetTriple() const { return TargetTriple; }