New test cases for mul folding

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

diff --git a/test/Transforms/InstCombine/mul.ll b/test/Transforms/InstCombine/mul.ll
new file mode 100644 (file)
index 0000000..077184c
--- /dev/null
+++ b/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
+