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1; RUN: llc -mcpu=corei7 -mtriple=x86_64-linux < %s | FileCheck %s
2
3define void @foo() !prof !1 {
4; Test if a cold block in a loop will be placed at the end of the function
5; chain.
6;
7; CHECK-LABEL: foo:
8; CHECK: callq b
9; CHECK: callq c
10; CHECK: callq e
11; CHECK: callq f
12; CHECK: callq d
13
14entry:
15  br label %header
16
17header:
18  call void @b()
19  %call = call zeroext i1 @a()
20  br i1 %call, label %if.then, label %if.else, !prof !4
21
22if.then:
23  call void @c()
24  br label %if.end
25
26if.else:
27  call void @d()
28  br label %if.end
29
30if.end:
31  call void @e()
32  %call2 = call zeroext i1 @a()
33  br i1 %call2, label %header, label %end, !prof !5
34
35end:
36  call void @f()
37  ret void
38}
39
40define void @nested_loop_0(i1 %flag) !prof !1 {
41; Test if a block that is cold in the inner loop but not cold in the outer loop
42; will merged to the outer loop chain.
43;
44; CHECK-LABEL: nested_loop_0:
45; CHECK: callq c
46; CHECK: callq d
47; CHECK: callq b
48; CHECK: callq e
49; CHECK: callq f
50
51entry:
52  br label %header
53
54header:
55  call void @b()
56  %call4 = call zeroext i1 @a()
57  br i1 %call4, label %header2, label %end
58
59header2:
60  call void @c()
61  %call = call zeroext i1 @a()
62  br i1 %call, label %if.then, label %if.else, !prof !2
63
64if.then:
65  call void @d()
66  %call3 = call zeroext i1 @a()
67  br i1 %call3, label %header2, label %header, !prof !3
68
69if.else:
70  call void @e()
71  br i1 %flag, label %header2, label %header, !prof !3
72
73end:
74  call void @f()
75  ret void
76}
77
78define void @nested_loop_1() !prof !1 {
79; Test if a cold block in an inner loop will be placed at the end of the
80; function chain.
81;
82; CHECK-LABEL: nested_loop_1:
83; CHECK: callq b
84; CHECK: callq c
85; CHECK: callq e
86; CHECK: callq d
87
88entry:
89  br label %header
90
91header:
92  call void @b()
93  br label %header2
94
95header2:
96  call void @c()
97  %call = call zeroext i1 @a()
98  br i1 %call, label %end, label %if.else, !prof !4
99
100if.else:
101  call void @d()
102  %call2 = call zeroext i1 @a()
103  br i1 %call2, label %header2, label %header, !prof !5
104
105end:
106  call void @e()
107  ret void
108}
109
110declare zeroext i1 @a()
111declare void @b()
112declare void @c()
113declare void @d()
114declare void @e()
115declare void @f()
116
117!1 = !{!"function_entry_count", i64 1}
118!2 = !{!"branch_weights", i32 100, i32 1}
119!3 = !{!"branch_weights", i32 1, i32 10}
120!4 = !{!"branch_weights", i32 1000, i32 1}
121!5 = !{!"branch_weights", i32 100, i32 1}
122