New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2732 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/ADCE/2002-05-23-ZeroArgPHITest.ll b/test/Transforms/ADCE/2002-05-23-ZeroArgPHITest.ll
new file mode 100644 (file)
index 0000000..4ddb3f1
--- /dev/null
+++ b/test/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
+}