New testcase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2291 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/InstCombine/add.ll

@@ -0,0 +1,32 @@
+; This test makes sure that add instructions are properly eliminated.
+;
+; This also tests that a subtract with a constant is properly converted
+; to a add w/negative constant
+
+; RUN: if as < %s | opt -instcombine -dce | dis | grep add
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+
+implementation
+
+int "test1"(int %A)
+begin
+	%B = add int %A, 0
+	ret int %B
+end
+
+int "test2"(int %A)
+begin
+	%B = add int %A, 5
+	%C = add int %B, -5
+	ret int %C
+end
+
+int "test3"(int %A)
+begin
+	%B = add int %A, 5
+	%C = sub int %B, 5   ;; This should get converted to an add
+	ret int %C
+end
+