1; RUN: opt < %s -S -O2 -unroll-runtime=true | FileCheck %s
2
3; Check runtime unrolling prologue can be promoted by LICM pass.
4
5; CHECK: entry:
6; CHECK: %xtraiter
7; CHECK: %lcmp.mod
8; CHECK: loop1:
9; CHECK: br i1 %lcmp.mod
10; CHECK: loop2.prol:
11
12define void @unroll(i32 %iter, i32* %addr1, i32* %addr2) nounwind {
13entry:
14  br label %loop1
15
16loop1:
17  %iv1 = phi i32 [ 0, %entry ], [ %inc1, %loop1.latch ]
18  %offset1 = getelementptr i32, i32* %addr1, i32 %iv1
19  store i32 %iv1, i32* %offset1, align 4
20  br label %loop2.header
21
22loop2.header:
23  %e = icmp uge i32 %iter, 1
24  br i1 %e, label %loop2, label %exit2
25
26loop2:
27  %iv2 = phi i32 [ 0, %loop2.header ], [ %inc2, %loop2 ]
28  %offset2 = getelementptr i32, i32* %addr2, i32 %iv2
29  store i32 %iv2, i32* %offset2, align 4
30  %inc2 = add i32 %iv2, 1
31  %exitcnd2 = icmp uge i32 %inc2, %iter
32  br i1 %exitcnd2, label %exit2, label %loop2
33
34exit2:
35  br label %loop1.latch
36
37loop1.latch:
38  %inc1 = add i32 %iv1, 1
39  %exitcnd1 = icmp uge i32 %inc1, 1024
40  br i1 %exitcnd1, label %exit, label %loop1
41
42exit:
43  ret void
44}
45