Add a bunch of testcases for cast-of-casts that should be removed.

llvm-svn: 3345

llvm/test/Regression/Transforms/InstCombine/cast.ll

@@ -25,3 +25,35 @@ ulong %test3(ulong %A) {    ; This function should just use bitwise AND
 	%c2 = cast ubyte %c1 to ulong
 	ret ulong %c2
 }
+
+uint %test4(int %A, int %B) {
+        %COND = setlt int %A, %B
+        %c = cast bool %COND to ubyte     ; Booleans are unsigned integrals
+        %result = cast ubyte %c to uint   ; for the cast elim purpose
+        ret uint %result
+}
+
+int %test5(bool %B) {
+        %c = cast bool %B to ubyte       ; This cast should get folded into
+        %result = cast ubyte %c to int   ; this cast
+        ret int %result
+}
+
+int %test6(ulong %A) {
+	%c1 = cast ulong %A to uint
+	%res = cast uint %c1 to int
+	ret int %res
+}
+
+long %test7(bool %A) {
+	%c1 = cast bool %A to int
+	%res = cast int %c1 to long
+	ret long %res
+}
+
+long %test8(sbyte %A) {
+        %c1 = cast sbyte %A to ulong
+        %res = cast ulong %c1 to long
+        ret long %res
+}
+