1 ; RUN: llc < %s -mtriple=armv7-apple-darwin | FileCheck %s
2 ; PHI elimination shouldn't break backedge.
5 %struct.list_data_s = type { i16, i16 }
6 %struct.list_head = type { %struct.list_head*, %struct.list_data_s* }
8 define arm_apcscc %struct.list_head* @t1(%struct.list_head* %list) nounwind {
11 %0 = icmp eq %struct.list_head* %list, null
12 br i1 %0, label %bb2, label %bb
19 %list_addr.05 = phi %struct.list_head* [ %2, %bb ], [ %list, %entry ]
20 %next.04 = phi %struct.list_head* [ %list_addr.05, %bb ], [ null, %entry ]
21 %1 = getelementptr inbounds %struct.list_head* %list_addr.05, i32 0, i32 0
22 %2 = load %struct.list_head** %1, align 4
23 store %struct.list_head* %next.04, %struct.list_head** %1, align 4
24 %3 = icmp eq %struct.list_head* %2, null
25 br i1 %3, label %bb2, label %bb
28 %next.0.lcssa = phi %struct.list_head* [ null, %entry ], [ %list_addr.05, %bb ]
29 ret %struct.list_head* %next.0.lcssa
32 ; Optimize loop entry, eliminate intra loop branches
34 define i32 @t2(i32 %passes, i32* nocapture %src, i32 %size) nounwind readonly {
38 %0 = icmp eq i32 %passes, 0 ; <i1> [#uses=1]
39 br i1 %0, label %bb5, label %bb.nph15
42 bb1: ; preds = %bb2.preheader, %bb1
45 %indvar = phi i32 [ %indvar.next, %bb1 ], [ 0, %bb2.preheader ] ; <i32> [#uses=2]
46 %sum.08 = phi i32 [ %2, %bb1 ], [ %sum.110, %bb2.preheader ] ; <i32> [#uses=1]
47 %tmp17 = sub i32 %i.07, %indvar ; <i32> [#uses=1]
48 %scevgep = getelementptr i32* %src, i32 %tmp17 ; <i32*> [#uses=1]
49 %1 = load i32* %scevgep, align 4 ; <i32> [#uses=1]
50 %2 = add nsw i32 %1, %sum.08 ; <i32> [#uses=2]
51 %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2]
52 %exitcond = icmp eq i32 %indvar.next, %size ; <i1> [#uses=1]
53 br i1 %exitcond, label %bb3, label %bb1
55 bb3: ; preds = %bb1, %bb2.preheader
60 %sum.0.lcssa = phi i32 [ %sum.110, %bb2.preheader ], [ %2, %bb1 ] ; <i32> [#uses=2]
61 %3 = add i32 %pass.011, 1 ; <i32> [#uses=2]
62 %exitcond18 = icmp eq i32 %3, %passes ; <i1> [#uses=1]
63 br i1 %exitcond18, label %bb5, label %bb2.preheader
65 bb.nph15: ; preds = %entry
66 %i.07 = add i32 %size, -1 ; <i32> [#uses=2]
67 %4 = icmp sgt i32 %i.07, -1 ; <i1> [#uses=1]
68 br label %bb2.preheader
70 bb2.preheader: ; preds = %bb3, %bb.nph15
71 %pass.011 = phi i32 [ 0, %bb.nph15 ], [ %3, %bb3 ] ; <i32> [#uses=1]
72 %sum.110 = phi i32 [ 0, %bb.nph15 ], [ %sum.0.lcssa, %bb3 ] ; <i32> [#uses=2]
73 br i1 %4, label %bb1, label %bb3
75 bb5: ; preds = %bb3, %entry
76 %sum.1.lcssa = phi i32 [ 0, %entry ], [ %sum.0.lcssa, %bb3 ] ; <i32> [#uses=1]