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 = 1.0
6entry:
7  br label %body
8
9; Loop backedges are weighted and thus their bodies have a greater frequency.
10; CHECK: body = 32.0
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 = 1.0
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 = 1.0
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 = 0.94116
35then:
36  br label %exit
37
38; CHECK: else = 0.05877
39else:
40  br label %exit
41
42; FIXME: It may be a bug that we don't sum back to 1.0.
43; CHECK: exit = 0.99993
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 = 1.0
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 = 0.04998
61case_a:
62  br label %exit
63
64; CHECK: case_b = 0.04998
65case_b:
66  br label %exit
67
68; The 'case_c' branch is predicted more likely via branch weight metadata.
69; CHECK: case_c = 0.79998
70case_c:
71  br label %exit
72
73; CHECK: case_d = 0.04998
74case_d:
75  br label %exit
76
77; CHECK: case_e = 0.04998
78case_e:
79  br label %exit
80
81; FIXME: It may be a bug that we don't sum back to 1.0.
82; CHECK: exit = 0.99993
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
94; CHECK: Printing analysis {{.*}} for function 'nested_loops'
95; CHECK: entry = 1.0
96; This test doesn't seem to be assigning sensible frequencies to nested loops.
97define void @nested_loops(i32 %a) {
98entry:
99  br label %for.cond1.preheader
100
101for.cond1.preheader:
102  %x.024 = phi i32 [ 0, %entry ], [ %inc12, %for.inc11 ]
103  br label %for.cond4.preheader
104
105for.cond4.preheader:
106  %y.023 = phi i32 [ 0, %for.cond1.preheader ], [ %inc9, %for.inc8 ]
107  %add = add i32 %y.023, %x.024
108  br label %for.body6
109
110for.body6:
111  %z.022 = phi i32 [ 0, %for.cond4.preheader ], [ %inc, %for.body6 ]
112  %add7 = add i32 %add, %z.022
113  tail call void @g(i32 %add7) #2
114  %inc = add i32 %z.022, 1
115  %cmp5 = icmp ugt i32 %inc, %a
116  br i1 %cmp5, label %for.inc8, label %for.body6, !prof !2
117
118for.inc8:
119  %inc9 = add i32 %y.023, 1
120  %cmp2 = icmp ugt i32 %inc9, %a
121  br i1 %cmp2, label %for.inc11, label %for.cond4.preheader, !prof !2
122
123for.inc11:
124  %inc12 = add i32 %x.024, 1
125  %cmp = icmp ugt i32 %inc12, %a
126  br i1 %cmp, label %for.end13, label %for.cond1.preheader, !prof !2
127
128for.end13:
129  ret void
130}
131
132declare void @g(i32) #1
133
134!2 = metadata !{metadata !"branch_weights", i32 1, i32 4000}
135