New test cases for mul folding

llvm-svn: 2416

1 files changed, 28 insertions, 0 deletions

diff --git a/llvm/test/Regression/Transforms/InstCombine/mul.ll b/llvm/test/Regression/Transforms/InstCombine/mul.ll
new file mode 100644
index 00000000000..077184cac2b
--- /dev/null
+++ b/llvm/test/Regression/Transforms/InstCombine/mul.ll
@@ -0,0 +1,28 @@
+; This test makes sure that mul instructions are properly eliminated.
+;
+
+; RUN: if as < %s | opt -instcombine -dce | dis | grep mul
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+
+implementation
+
+int "test1"(int %A)
+begin
+	%B = mul int %A, 1
+	ret int %B
+end
+
+int "test2"(int %A)
+begin
+	%B = mul int %A, 2   ; Should convert to an add instruction
+	ret int %B
+end
+
+int "test3"(int %A)
+begin
+	%B = mul int %A, 0   ; This should disappear entirely
+	ret int %B
+end
+