implement a TODO by teaching jump threading about "xor x, 1".
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86739 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/JumpThreading/basic.ll b/test/Transforms/JumpThreading/basic.ll
index ccb2a3f..c161a77 100644
--- a/test/Transforms/JumpThreading/basic.ll
+++ b/test/Transforms/JumpThreading/basic.ll
@@ -245,3 +245,42 @@
ret i32 2
}
+
+;;; Verify that we can handle constraint propagation through "xor x, 1".
+define i32 @test9(i1 %cond, i1 %cond2) {
+Entry:
+; CHECK: @test9
+ %v1 = call i32 @f1()
+ br i1 %cond, label %Merge, label %F1
+
+; CHECK: Entry:
+; CHECK-NEXT: %v1 = call i32 @f1()
+; CHECK-NEXT: br i1 %cond, label %F2, label %Merge
+
+F1:
+ %v2 = call i32 @f2()
+ br label %Merge
+
+Merge:
+ %B = phi i32 [%v1, %Entry], [%v2, %F1]
+ %M = icmp eq i32 %B, %v1
+ %M1 = xor i1 %M, 1
+ %N = icmp eq i32 %B, 47
+ %O = and i1 %M1, %N
+ br i1 %O, label %T2, label %F2
+
+; CHECK: Merge:
+; CHECK-NOT: phi
+; CHECK-NEXT: %v2 = call i32 @f2()
+
+T2:
+ %Q = zext i1 %M to i32
+ ret i32 %Q
+
+F2:
+ ret i32 %B
+; CHECK: F2:
+; CHECK-NEXT: phi i32
+}
+
+