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1; RUN: opt < %s -analyze -block-freq | FileCheck %s
2
3define i32 @test1(i32 %i, i32* %a) {
4; CHECK: Printing analysis {{.*}} for function 'test1'
5; CHECK: entry = 1024
6entry:
7  br label %body
8
9; Loop backedges are weighted and thus their bodies have a greater frequency.
10; CHECK: body = 31744
11body:
12  %iv = phi i32 [ 0, %entry ], [ %next, %body ]
13  %base = phi i32 [ 0, %entry ], [ %sum, %body ]
14  %arrayidx = getelementptr inbounds i32* %a, i32 %iv
15  %0 = load i32* %arrayidx
16  %sum = add nsw i32 %0, %base
17  %next = add i32 %iv, 1
18  %exitcond = icmp eq i32 %next, %i
19  br i1 %exitcond, label %exit, label %body
20
21; CHECK: exit = 1024
22exit:
23  ret i32 %sum
24}
25
26define i32 @test2(i32 %i, i32 %a, i32 %b) {
27; CHECK: Printing analysis {{.*}} for function 'test2'
28; CHECK: entry = 1024
29entry:
30  %cond = icmp ult i32 %i, 42
31  br i1 %cond, label %then, label %else, !prof !0
32
33; The 'then' branch is predicted more likely via branch weight metadata.
34; CHECK: then = 963
35then:
36  br label %exit
37
38; CHECK: else = 60
39else:
40  br label %exit
41
42; FIXME: It may be a bug that we don't sum back to 1024.
43; CHECK: exit = 1023
44exit:
45  %result = phi i32 [ %a, %then ], [ %b, %else ]
46  ret i32 %result
47}
48
49!0 = metadata !{metadata !"branch_weights", i32 64, i32 4}
50
51define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
52; CHECK: Printing analysis {{.*}} for function 'test3'
53; CHECK: entry = 1024
54entry:
55  switch i32 %i, label %case_a [ i32 1, label %case_b
56                                 i32 2, label %case_c
57                                 i32 3, label %case_d
58                                 i32 4, label %case_e ], !prof !1
59
60; CHECK: case_a = 51
61case_a:
62  br label %exit
63
64; CHECK: case_b = 51
65case_b:
66  br label %exit
67
68; The 'case_c' branch is predicted more likely via branch weight metadata.
69; CHECK: case_c = 819
70case_c:
71  br label %exit
72
73; CHECK: case_d = 51
74case_d:
75  br label %exit
76
77; CHECK: case_e = 51
78case_e:
79  br label %exit
80
81; FIXME: It may be a bug that we don't sum back to 1024.
82; CHECK: exit = 1023
83exit:
84  %result = phi i32 [ %a, %case_a ],
85                    [ %b, %case_b ],
86                    [ %c, %case_c ],
87                    [ %d, %case_d ],
88                    [ %e, %case_e ]
89  ret i32 %result
90}
91
92!1 = metadata !{metadata !"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4}
93