xref: /llvm-project/llvm/test/Transforms/LoopUnroll/update-loop-info-in-subloops.ll (revision f3a928e2334a4e8e3f09406f2ce7e1cbac520f95) 
1; RUN: opt -S < %s -passes='require<opt-remark-emit>,loop-unroll,require<block-freq>' | FileCheck %s
2; Crasher from PR20987.
3
4; CHECK: define void @update_loop_info_in_subloops
5; CHECK: entry:
6; CHECK: L:
7; CHECK: L.inner:
8; CHECK: L.inner.latch:
9; CHECK: L.latch:
10; CHECK: L.inner.1:
11; CHECK: L.inner.latch.1:
12; CHECK: L.latch.1:
13
14define void @update_loop_info_in_subloops() {
15entry:
16  br label %L
17
18L:
19  %0 = phi i64 [ 1, %entry ], [ %1, %L.latch ]
20  br label %L.inner
21
22L.inner:
23  br label %L.inner.latch
24
25L.inner.latch:
26  br i1 false, label %L.latch, label %L.inner
27
28L.latch:
29  %1 = add i64 %0, 1
30  %2 = icmp eq i64 %1, 3
31  br i1 %2, label %exit, label %L
32
33exit:
34  ret void
35}
36