1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -unify-loop-exits -enable-new-pm=0 -S | FileCheck %s
3; RUN: opt < %s -passes='lowerswitch,unify-loop-exits' -S | FileCheck %s
4
5define void @nested(i1 %PredB3, i1 %PredB4, i1 %PredA4, i1 %PredA3, i32 %X, i32 %Y, i32 %Z) {
6; CHECK-LABEL: @nested(
7; CHECK-NEXT:  entry:
8; CHECK-NEXT:    br label [[A1:%.*]]
9; CHECK:       A1:
10; CHECK-NEXT:    br label [[B1:%.*]]
11; CHECK:       B1:
12; CHECK-NEXT:    br label [[B2:%.*]]
13; CHECK:       B2:
14; CHECK-NEXT:    [[X_INC:%.*]] = add i32 [[X:%.*]], 1
15; CHECK-NEXT:    br label [[B3:%.*]]
16; CHECK:       B3:
17; CHECK-NEXT:    br i1 [[PREDB3:%.*]], label [[B4:%.*]], label [[LOOP_EXIT_GUARD1:%.*]]
18; CHECK:       B4:
19; CHECK-NEXT:    br i1 [[PREDB4:%.*]], label [[B1]], label [[LOOP_EXIT_GUARD1]]
20; CHECK:       A2:
21; CHECK-NEXT:    br label [[A4:%.*]]
22; CHECK:       A3:
23; CHECK-NEXT:    br label [[A4]]
24; CHECK:       A4:
25; CHECK-NEXT:    [[A4_PHI:%.*]] = phi i32 [ [[Y:%.*]], [[A3:%.*]] ], [ [[X_INC_MOVED:%.*]], [[A2:%.*]] ]
26; CHECK-NEXT:    br i1 [[PREDA4:%.*]], label [[LOOP_EXIT_GUARD:%.*]], label [[A5:%.*]]
27; CHECK:       A5:
28; CHECK-NEXT:    br i1 [[PREDA3:%.*]], label [[LOOP_EXIT_GUARD]], label [[A1]]
29; CHECK:       C:
30; CHECK-NEXT:    br label [[EXIT:%.*]]
31; CHECK:       exit:
32; CHECK-NEXT:    [[EXIT_PHI:%.*]] = phi i32 [ [[Z:%.*]], [[C:%.*]] ], [ [[EXIT_PHI_MOVED:%.*]], [[LOOP_EXIT_GUARD]] ]
33; CHECK-NEXT:    ret void
34; CHECK:       loop.exit.guard:
35; CHECK-NEXT:    [[GUARD_C:%.*]] = phi i1 [ true, [[A4]] ], [ false, [[A5]] ]
36; CHECK-NEXT:    [[EXIT_PHI_MOVED]] = phi i32 [ undef, [[A4]] ], [ [[A4_PHI]], [[A5]] ]
37; CHECK-NEXT:    br i1 [[GUARD_C]], label [[C]], label [[EXIT]]
38; CHECK:       loop.exit.guard1:
39; CHECK-NEXT:    [[GUARD_A3:%.*]] = phi i1 [ true, [[B3]] ], [ false, [[B4]] ]
40; CHECK-NEXT:    [[X_INC_MOVED]] = phi i32 [ [[X_INC]], [[B3]] ], [ [[X_INC]], [[B4]] ]
41; CHECK-NEXT:    br i1 [[GUARD_A3]], label [[A3]], label [[A2]]
42;
43entry:
44  br label %A1
45
46A1:
47  br label %B1
48
49B1:
50  br label %B2
51
52B2:
53  %X.inc = add i32 %X, 1
54  br label %B3
55
56B3:
57  br i1 %PredB3, label %B4, label %A3
58
59B4:
60  br i1 %PredB4, label %B1, label %A2
61
62A2:
63  br label %A4
64
65A3:
66  br label %A4
67
68A4:
69  %A4.phi = phi i32 [%Y, %A3], [%X.inc, %A2]
70  br i1 %PredA4, label %C, label %A5
71
72A5:
73  br i1 %PredA3, label %exit, label %A1
74
75C:
76  br label %exit
77
78exit:
79  %exit.phi = phi i32 [%A4.phi, %A5], [%Z, %C]
80  ret void
81}
82