New test cases for mul folding

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2416 91177308-0d34-0410-b5e6-96231b3b80d8

test/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
+