1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -S -o - -structurizecfg < %s | FileCheck %s
3
4;
5; TODO: eliminate redundant phis for the loop counter
6;
7define void @test1() {
8; CHECK-LABEL: @test1(
9; CHECK-NEXT:  entry:
10; CHECK-NEXT:    br label [[LOOP:%.*]]
11; CHECK:       Flow:
12; CHECK-NEXT:    [[TMP0:%.*]] = phi i32 [ [[CTR_NEXT:%.*]], [[LOOP_B:%.*]] ], [ [[CTR_NEXT]], [[LOOP_A:%.*]] ]
13; CHECK-NEXT:    br label [[FLOW1:%.*]]
14; CHECK:       loop:
15; CHECK-NEXT:    [[CTR:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[TMP1:%.*]], [[FLOW1]] ]
16; CHECK-NEXT:    [[CTR_NEXT]] = add i32 [[CTR]], 1
17; CHECK-NEXT:    br i1 undef, label [[LOOP_A]], label [[FLOW1]]
18; CHECK:       loop.a:
19; CHECK-NEXT:    br i1 undef, label [[LOOP_B]], label [[FLOW:%.*]]
20; CHECK:       loop.b:
21; CHECK-NEXT:    br label [[FLOW]]
22; CHECK:       Flow1:
23; CHECK-NEXT:    [[TMP1]] = phi i32 [ [[TMP0]], [[FLOW]] ], [ undef, [[LOOP]] ]
24; CHECK-NEXT:    [[TMP2:%.*]] = phi i1 [ false, [[FLOW]] ], [ true, [[LOOP]] ]
25; CHECK-NEXT:    br i1 [[TMP2]], label [[EXIT:%.*]], label [[LOOP]]
26; CHECK:       exit:
27; CHECK-NEXT:    ret void
28;
29entry:
30  br label %loop
31
32loop:
33  %ctr = phi i32 [ 0, %entry ], [ %ctr.next, %loop.a ], [ %ctr.next, %loop.b ]
34  %ctr.next = add i32 %ctr, 1
35  br i1 undef, label %exit, label %loop.a
36
37loop.a:
38  br i1 undef, label %loop, label %loop.b
39
40loop.b:
41  br label %loop
42
43exit:
44  ret void
45}
46