xref: /llvm-project/llvm/test/Transforms/LoopFusion/no_sink_hoist_unknown_function.ll (revision 27291c1e70aa0e34e297ec4913a60274f32a199f) 
1; RUN: opt -S -passes=loop-simplify,loop-fusion -debug-only=loop-fusion < %s 2>&1 | FileCheck %s
2; REQUIRES: asserts
3; CHECK: Could not hoist/sink all instructions
4
5declare void @unknown_func()
6
7define void @sink_preheader(i32 %N) {
8; CHECK:pre1:
9; CHECK-NEXT:  br label %body1
10pre1:
11  br label %body1
12
13; CHECK:body1:
14; CHECK-NOT: call void @unknown_func()
15body1:  ; preds = %pre1, %body1
16  %i = phi i32 [%i_next, %body1], [0, %pre1]
17  %i_next = add i32 1, %i
18  %cond = icmp ne i32 %i, %N
19  br i1 %cond, label %body1, label %pre2
20
21; CHECK:pre2:
22; CHECK-NEXT: call void @unknown_func()
23pre2:
24  call void @unknown_func()
25  br label %body2
26
27; CHECK: body2:
28; CHECK-NOT: call void @unknown_func()
29body2:  ; preds = %pre2, %body2
30  %i2 = phi i32 [%i_next2, %body2], [0, %pre2]
31  %i_next2 = add i32 1, %i2
32  %cond2 = icmp ne i32 %i2, %N
33  br i1 %cond2, label %body2, label %exit
34
35; CHECK: exit:
36exit:
37  ret void
38}
39