1; This testcase contains a entire loop that should be removed. The only thing 2; left is the store instruction in BB0. The problem this testcase was running 3; into was that when the reg109 PHI was getting zero predecessors, it was 4; removed even though there were uses still around. Now the uses are filled 5; in with a dummy value before the PHI is deleted. 6; 7; RUN: opt < %s -adce 8 9 %node_t = type { double*, %node_t*, %node_t**, double**, double*, i32, i32 } 10 11define void @localize_local(%node_t* %nodelist) { 12bb0: 13 %nodelist.upgrd.1 = alloca %node_t* ; <%node_t**> [#uses=2] 14 store %node_t* %nodelist, %node_t** %nodelist.upgrd.1 15 br label %bb1 16 17bb1: ; preds = %bb0 18 %reg107 = load %node_t*, %node_t** %nodelist.upgrd.1 ; <%node_t*> [#uses=2] 19 %cond211 = icmp eq %node_t* %reg107, null ; <i1> [#uses=1] 20 br i1 %cond211, label %bb3, label %bb2 21 22bb2: ; preds = %bb2, %bb1 23 %reg109 = phi %node_t* [ %reg110, %bb2 ], [ %reg107, %bb1 ] ; <%node_t*> [#uses=1] 24 %reg212 = getelementptr %node_t, %node_t* %reg109, i64 0, i32 1 ; <%node_t**> [#uses=1] 25 %reg110 = load %node_t*, %node_t** %reg212 ; <%node_t*> [#uses=2] 26 %cond213 = icmp ne %node_t* %reg110, null ; <i1> [#uses=1] 27 br i1 %cond213, label %bb2, label %bb3 28 29bb3: ; preds = %bb2, %bb1 30 ret void 31} 32 33