1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -passes='loop-mssa(loop-instsimplify,loop-simplifycfg,simple-loop-unswitch)' -S %s | FileCheck %s
3
4; Test case from PR54023. After SimpleLoopUnswitch, one of the loops processed
5; by LoopSimplifyCFG will have exit blocks with predecessors outside the loop
6; (i.e. it is not in loop-simplify/canonical form).
7; FIXME: currently %res gets incorrectly replaced with undef.
8define i32 @test(i32 %v, i1 %c.1, i1 %c.2) {
9; CHECK-LABEL: @test(
10; CHECK-NEXT:  entry:
11; CHECK-NEXT:    switch i32 0, label [[ENTRY_SPLIT:%.*]] [
12; CHECK-NEXT:    i32 1, label [[EXIT_SPLIT:%.*]]
13; CHECK-NEXT:    ]
14; CHECK:       entry.split:
15; CHECK-NEXT:    br label [[OUTER_HEADER:%.*]]
16; CHECK:       outer.header:
17; CHECK-NEXT:    br i1 [[C_1:%.*]], label [[OUTER_LATCH:%.*]], label [[INNER_HEADER_PREHEADER:%.*]]
18; CHECK:       inner.header.preheader:
19; CHECK-NEXT:    br label [[INNER_HEADER:%.*]]
20; CHECK:       inner.header:
21; CHECK-NEXT:    [[CMP_2:%.*]] = icmp ne i32 [[V:%.*]], 0
22; CHECK-NEXT:    br i1 [[CMP_2]], label [[EXIT:%.*]], label [[INNER_LATCH:%.*]]
23; CHECK:       inner.latch:
24; CHECK-NEXT:    br i1 [[C_2:%.*]], label [[OUTER_LATCH_LOOPEXIT:%.*]], label [[INNER_HEADER]]
25; CHECK:       outer.latch.loopexit:
26; CHECK-NEXT:    br label [[OUTER_LATCH]]
27; CHECK:       outer.latch:
28; CHECK-NEXT:    br label [[OUTER_HEADER]]
29; CHECK:       exit:
30; CHECK-NEXT:    [[RES:%.*]] = phi i32 [ [[V]], [[INNER_HEADER]] ]
31; CHECK-NEXT:    br label [[EXIT_SPLIT]]
32; CHECK:       exit.split:
33; CHECK-NEXT:    ret i32 undef
34;
35entry:
36  br label %outer.header
37
38outer.header:
39  %g.0 = phi i32 [ 10, %outer.latch ], [ 1, %entry ]
40  %cmp.1 = icmp eq i32 %g.0, 0
41  br i1 %c.1, label %outer.latch, label %inner.header
42
43inner.header:
44  %cmp.2 = icmp ne i32 %v, 0
45  %or.cond = or i1 %cmp.1, %cmp.2
46  br i1 %or.cond, label %exit, label %inner.latch
47
48inner.latch:
49  br i1 %c.2, label %outer.latch, label %inner.header
50
51outer.latch:
52  br label %outer.header
53
54exit:
55  %res = phi i32 [ %v, %inner.header ]
56  ret i32 %res
57}
58