1 files changed, 53 insertions, 0 deletions
diff --git a/test/Transforms/JumpThreading/basic.ll b/test/Transforms/JumpThreading/basic.ll
new file mode 100644
index 0000000000000..bf746e7f139c8
--- /dev/null
+++ b/test/Transforms/JumpThreading/basic.ll
@@ -0,0 +1,53 @@
+; RUN: llvm-as < %s | opt -jump-threading -simplifycfg -mem2reg | llvm-dis | grep {ret i32 %v1}
+; There should be no uncond branches left.
+; RUN: llvm-as < %s | opt -jump-threading -simplifycfg -mem2reg | llvm-dis | not grep {br label}
+
+declare i32 @f1()
+declare i32 @f2()
+declare void @f3()
+
+define i32 @test(i1 %cond) {
+	br i1 %cond, label %T1, label %F1
+
+T1:
+	%v1 = call i32 @f1()
+	br label %Merge
+
+F1:
+	%v2 = call i32 @f2()
+	br label %Merge
+
+Merge:
+	%A = phi i1 [true, %T1], [false, %F1]
+	%B = phi i32 [%v1, %T1], [%v2, %F1]
+	br i1 %A, label %T2, label %F2
+
+T2:
+	call void @f3()
+	ret i32 %B
+
+F2:
+	ret i32 %B
+}
+
+
+;; cond is known false on Entry -> F1 edge!
+define i32 @test2(i1 %cond) {
+Entry:
+	br i1 %cond, label %T1, label %F1
+
+T1:
+	%v1 = call i32 @f1()
+	br label %Merge
+
+F1:
+	br i1 %cond, label %Merge, label %F2
+
+Merge:
+	%B = phi i32 [47, %T1], [192, %F1]
+	ret i32 %B
+
+F2:
+	call void @f3()
+	ret i32 12
+}