New testcase for the deadreturnvalue deletion extension to -deadargelim

llvm-svn: 9389

llvm/test/Regression/Transforms/DeadArgElim/deadretval.ll

@@ -0,0 +1,19 @@
+; RUN: llvm-as < %s | opt -deadargelim | llvm-dis | not grep DEAD
+
+implementation
+
+internal int %test(int %DEADARG) {  ; Dead arg only used by dead retval
+	ret int %DEADARG
+}
+
+int %test2(int %A) {
+	%DEAD = call int %test(int %A)
+	ret int 123
+}
+
+int %test3() {
+	%X = call int %test2(int 3232)
+	%Y = add int %X, -123
+	ret int %Y
+}
+

llvm/test/Regression/Transforms/DeadArgElim/deadretval2.ll

@@ -0,0 +1,36 @@
+; RUN: llvm-as < %s | opt -deadargelim -die | llvm-dis | not grep DEAD
+
+%P = external global int 
+
+implementation
+
+
+internal int %test(int %DEADARG) {  ; Dead arg only used by dead retval
+        ret int %DEADARG
+}
+
+internal int %test2(int %DEADARG) {
+	%DEADRETVAL = call int %test(int %DEADARG)
+	ret int %DEADRETVAL
+}
+
+void %test3(int %X) {
+	%DEADRETVAL = call int %test2(int %X)
+	ret void
+}
+
+internal int %foo() {
+	%DEAD = load int* %P
+	ret int %DEAD
+}
+
+internal int %id(int %X) {
+	ret int %X
+}
+
+void %test4() {
+	%DEAD = call int %foo()
+	%DEAD2 = call int %id(int %DEAD)
+	ret void
+}
+