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/test/CodeGen/X86/cmpxchg16b.ll b/test/CodeGen/X86/cmpxchg16b.ll
new file mode 100644
index 0000000..ba1c4ef
--- /dev/null
+++ b/test/CodeGen/X86/cmpxchg16b.ll
@@ -0,0 +1,13 @@
+; RUN: llc < %s -march=x86-64 -mcpu=core2 | FileCheck %s
+
+; Basic 128-bit cmpxchg
+define void @t1(i128* nocapture %p) nounwind ssp {
+entry:
+; CHECK movl $1, %ebx
+; CHECK: lock
+; CHECK-NEXT: cmpxchg16b
+ %r = cmpxchg i128* %p, i128 0, i128 1 seq_cst
+ ret void
+}
+
+; FIXME: Handle 128-bit atomicrmw/load atomic/store atomic