New testcase

llvm-svn: 2732

test/Regression/Transforms/ADCE/2002-05-23-ZeroArgPHITest.ll

@@ -0,0 +1,33 @@
+; This testcase contains a entire loop that should be removed.  The only thing
+; left is the store instruction in BB0.  The problem this testcase was running
+; into was that when the reg109 PHI was getting zero predecessors, it was 
+; removed even though there were uses still around.  Now the uses are filled
+; in with a dummy value before the PHI is deleted.
+;
+; RUN: as < %s | opt -adce
+	
+%node_t = type { double*, %node_t*, %node_t**, double**, double*, int, int }
+
+implementation   ; Functions:
+
+void %localize_local(%node_t* %nodelist) {
+bb0:					;[#uses=0]
+	%nodelist = alloca %node_t*		; <%node_t**> [#uses=2]
+	store %node_t* %nodelist, %node_t** %nodelist
+	br label %bb1
+
+bb1:					;[#uses=2]
+	%reg107 = load %node_t** %nodelist, uint 0		; <%node_t*> [#uses=2]
+	%cond211 = seteq %node_t* %reg107, null		; <bool> [#uses=1]
+	br bool %cond211, label %bb3, label %bb2
+
+bb2:					;[#uses=3]
+	%reg109 = phi %node_t* [ %reg110, %bb2 ], [ %reg107, %bb1 ]		; <%node_t*> [#uses=1]
+	%reg212 = getelementptr %node_t* %reg109, uint 0, ubyte 1		; <%node_t**> [#uses=1]
+	%reg110 = load %node_t** %reg212		; <%node_t*> [#uses=2]
+	%cond213 = setne %node_t* %reg110, null		; <bool> [#uses=1]
+	br bool %cond213, label %bb2, label %bb3
+
+bb3:					;[#uses=2]
+	ret void
+}