--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/CodeGen/X86/cmpxchg-i128-i1.ll	Mon Sep 08 22:06:00 2014 +0900
@@ -0,0 +1,83 @@
+; RUN: llc -mcpu=core-avx2 -mtriple=x86_64 -o - %s | FileCheck %s
+
+define i1 @try_cmpxchg(i128* %addr, i128 %desired, i128 %new) {
+; CHECK-LABEL: try_cmpxchg:
+; CHECK: cmpxchg16b
+; CHECK-NOT: cmp
+; CHECK: sete %al
+; CHECK: retq
+  %pair = cmpxchg i128* %addr, i128 %desired, i128 %new seq_cst seq_cst
+  %success = extractvalue { i128, i1 } %pair, 1
+  ret i1 %success
+}
+
+define void @cmpxchg_flow(i128* %addr, i128 %desired, i128 %new) {
+; CHECK-LABEL: cmpxchg_flow:
+; CHECK: cmpxchg16b
+; CHECK-NOT: cmp
+; CHECK-NOT: set
+; CHECK: {{jne|jeq}}
+  %pair = cmpxchg i128* %addr, i128 %desired, i128 %new seq_cst seq_cst
+  %success = extractvalue { i128, i1 } %pair, 1
+  br i1 %success, label %true, label %false
+
+true:
+  call void @foo()
+  ret void
+
+false:
+  call void @bar()
+  ret void
+}
+
+; Can't use the flags here because cmpxchg16b only sets ZF.
+define i1 @cmpxchg_arithcmp(i128* %addr, i128 %desired, i128 %new) {
+; CHECK-LABEL: cmpxchg_arithcmp:
+; CHECK: cmpxchg16b
+; CHECK: cmpq
+; CHECK: retq
+  %pair = cmpxchg i128* %addr, i128 %desired, i128 %new seq_cst seq_cst
+  %oldval = extractvalue { i128, i1 } %pair, 0
+  %success = icmp sge i128 %oldval, %desired
+  ret i1 %success
+}
+
+define i128 @cmpxchg_zext(i128* %addr, i128 %desired, i128 %new) {
+; CHECK-LABEL: cmpxchg_zext:
+; CHECK: cmpxchg16b
+; CHECK-NOT: cmpq
+; CHECK: sete [[BYTE:%[a-z0-9]+]]
+; CHECK: movzbl [[BYTE]], %eax
+  %pair = cmpxchg i128* %addr, i128 %desired, i128 %new seq_cst seq_cst
+  %success = extractvalue { i128, i1 } %pair, 1
+  %mask = zext i1 %success to i128
+  ret i128 %mask
+}
+
+
+define i128 @cmpxchg_use_eflags_and_val(i128* %addr, i128 %offset) {
+; CHECK-LABEL: cmpxchg_use_eflags_and_val:
+
+; CHECK: cmpxchg16b
+; CHECK-NOT: cmpq
+; CHECK: jne
+entry:
+  %init = load atomic i128* %addr seq_cst, align 16
+  br label %loop
+
+loop:
+  %old = phi i128 [%init, %entry], [%oldval, %loop]
+  %new = add i128 %old, %offset
+
+  %pair = cmpxchg i128* %addr, i128 %old, i128 %new seq_cst seq_cst
+  %oldval = extractvalue { i128, i1 } %pair, 0
+  %success = extractvalue { i128, i1 } %pair, 1
+
+  br i1 %success, label %done, label %loop
+
+done:
+  ret i128 %old
+}
+
+declare void @foo()
+declare void @bar()