1 files changed, 15 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/2004-02-23-ShiftShiftOverflow.ll b/test/Transforms/InstCombine/2004-02-23-ShiftShiftOverflow.ll
new file mode 100644
index 0000000..85095bf
--- /dev/null
+++ b/test/Transforms/InstCombine/2004-02-23-ShiftShiftOverflow.ll
@@ -0,0 +1,15 @@
+; RUN: llvm-upgrade < %s | llvm-as | opt -instcombine | llvm-dis | not grep 34
+
+int %test(int %X) {
+	; Do not fold into shr X, 34, as this uses undefined behavior!
+	%Y = shr int %X, ubyte 17
+	%Z = shr int %Y, ubyte 17
+	ret int %Z
+}
+
+int %test2(int %X) {
+	; Do not fold into shl X, 34, as this uses undefined behavior!
+	%Y = shl int %X, ubyte 17
+	%Z = shl int %Y, ubyte 17
+	ret int %Z
+}