1; RUN: llc -O2 < %s | FileCheck %s
2
3target triple = "powerpc64le-grtev4-linux-gnu"
4
5; No duplication of loop header into entry block.
6define void @no_duplicate1(i64 %a) {
7; CHECK-LABEL: no_duplicate1
8; CHECK:        mr 30, 3
9; CHECK-NEXT:   b .LBB0_2
10
11; CHECK:      .LBB0_2:
12; CHECK-NEXT:   # =>This Inner Loop Header: Depth=1
13; CHECK-NEXT:   cmpldi 30, 100
14; CHECK-NEXT:   bne 0, .LBB0_1
15entry:
16  br label %header
17
18header:
19  %ind = phi i64 [%a, %entry], [%val3, %latch]
20  %cond1 = icmp eq i64 %ind, 100
21  br i1 %cond1, label %middle, label %latch
22
23middle:
24  %condx = call i1 @foo()
25  %val1 = xor i64 %ind, 2
26  br label %latch
27
28latch:
29  %val2 = phi i64 [%ind, %header], [%val1, %middle]
30  %val3 = add i64 %val2, 1
31  %cond2 = call i1 @foo()
32  br i1 %cond2, label %end, label %header
33
34end:
35  ret void
36}
37
38; No duplication of loop header into latches.
39define void @no_duplicate2(i64 %a) {
40; CHECK-LABEL: no_duplicate2
41; CHECK:        mr 30, 3
42; CHECK-NEXT:   b .LBB1_2
43
44; CHECK:      .LBB1_2:
45; CHECK-NEXT:   # =>This Inner Loop Header: Depth=1
46; CHECK-NEXT:   cmpldi 30, 100
47; CHECK-NEXT:   bne 0, .LBB1_1
48
49; CHECK:      %latch2
50; CHECK:        b .LBB1_2
51
52; CHECK:      %latch3
53; CHECK:        b .LBB1_2
54entry:
55  br label %header
56
57header:
58  %ind = phi i64 [%a, %entry], [%val1, %latch1], [%val2, %latch2], [%val2, %latch3]
59  %cond1 = icmp eq i64 %ind, 100
60  br i1 %cond1, label %middle1, label %latch1
61
62latch1:
63  %cond2 = call i1 @foo()
64  %val1 = xor i64 %ind, 2
65  br i1 %cond2, label %end, label %header
66
67middle1:
68  %cond3 = call i1 @foo()
69  br i1 %cond3, label %latch1, label %middle2
70
71middle2:
72  %cond4 = call i1 @foo()
73  %val2 = add i64 %ind, 1
74  br i1 %cond4, label %latch2, label %latch3
75
76latch2:
77  call void @a()
78  br label %header
79
80latch3:
81  call void @b()
82  br label %header
83
84end:
85  ret void
86}
87
88
89declare i1 @foo()
90declare void @a()
91declare void @b()
92