Add a test case for PR1271 (necessary, but not sufficient).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35343 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/2007-03-25-DoubleShift.ll b/test/Transforms/InstCombine/2007-03-25-DoubleShift.ll
new file mode 100644 (file)
index 0000000..d67e1a1
--- /dev/null
+++ b/test/Transforms/InstCombine/2007-03-25-DoubleShift.ll
@@ -0,0 +1,9 @@
+; PR1271
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep and
+define i1 @test(i32 %tmp13) {
+entry:
+       %tmp14 = shl i32 %tmp13, 12             ; <i32> [#uses=1]
+       %tmp15 = lshr i32 %tmp14, 12            ; <i32> [#uses=1]
+       %res = icmp ne i32 %tmp15, 0            ; <i1>:3 [#uses=1]
+        ret i1 %res
+}