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1; RUN: opt < %s -analyze -branch-prob | FileCheck %s
2
3define i32 @test1(i32 %i, i32* %a) {
4; CHECK: Printing analysis {{.*}} for function 'test1'
5entry:
6  br label %body
7; CHECK: edge entry -> body probability is 16 / 16 = 100%
8
9body:
10  %iv = phi i32 [ 0, %entry ], [ %next, %body ]
11  %base = phi i32 [ 0, %entry ], [ %sum, %body ]
12  %arrayidx = getelementptr inbounds i32* %a, i32 %iv
13  %0 = load i32* %arrayidx
14  %sum = add nsw i32 %0, %base
15  %next = add i32 %iv, 1
16  %exitcond = icmp eq i32 %next, %i
17  br i1 %exitcond, label %exit, label %body
18; CHECK: edge body -> exit probability is 4 / 128
19; CHECK: edge body -> body probability is 124 / 128
20
21exit:
22  ret i32 %sum
23}
24
25define i32 @test2(i32 %i, i32 %a, i32 %b) {
26; CHECK: Printing analysis {{.*}} for function 'test2'
27entry:
28  %cond = icmp ult i32 %i, 42
29  br i1 %cond, label %then, label %else, !prof !0
30; CHECK: edge entry -> then probability is 64 / 68
31; CHECK: edge entry -> else probability is 4 / 68
32
33then:
34  br label %exit
35; CHECK: edge then -> exit probability is 16 / 16 = 100%
36
37else:
38  br label %exit
39; CHECK: edge else -> exit probability is 16 / 16 = 100%
40
41exit:
42  %result = phi i32 [ %a, %then ], [ %b, %else ]
43  ret i32 %result
44}
45
46!0 = metadata !{metadata !"branch_weights", i32 64, i32 4}
47
48define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
49; CHECK: Printing analysis {{.*}} for function 'test3'
50entry:
51  switch i32 %i, label %case_a [ i32 1, label %case_b
52                                 i32 2, label %case_c
53                                 i32 3, label %case_d
54                                 i32 4, label %case_e ], !prof !1
55; CHECK: edge entry -> case_a probability is 4 / 80
56; CHECK: edge entry -> case_b probability is 4 / 80
57; CHECK: edge entry -> case_c probability is 64 / 80
58; CHECK: edge entry -> case_d probability is 4 / 80
59; CHECK: edge entry -> case_e probability is 4 / 80
60
61case_a:
62  br label %exit
63; CHECK: edge case_a -> exit probability is 16 / 16 = 100%
64
65case_b:
66  br label %exit
67; CHECK: edge case_b -> exit probability is 16 / 16 = 100%
68
69case_c:
70  br label %exit
71; CHECK: edge case_c -> exit probability is 16 / 16 = 100%
72
73case_d:
74  br label %exit
75; CHECK: edge case_d -> exit probability is 16 / 16 = 100%
76
77case_e:
78  br label %exit
79; CHECK: edge case_e -> exit probability is 16 / 16 = 100%
80
81exit:
82  %result = phi i32 [ %a, %case_a ],
83                    [ %b, %case_b ],
84                    [ %c, %case_c ],
85                    [ %d, %case_d ],
86                    [ %e, %case_e ]
87  ret i32 %result
88}
89
90!1 = metadata !{metadata !"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4}
91
92define i32 @test4(i32 %x) nounwind uwtable readnone ssp {
93; CHECK: Printing analysis {{.*}} for function 'test4'
94entry:
95  %conv = sext i32 %x to i64
96  switch i64 %conv, label %return [
97    i64 0, label %sw.bb
98    i64 1, label %sw.bb
99    i64 2, label %sw.bb
100    i64 5, label %sw.bb1
101  ], !prof !2
102; CHECK: edge entry -> return probability is 7 / 85
103; CHECK: edge entry -> sw.bb probability is 14 / 85
104; CHECK: edge entry -> sw.bb1 probability is 64 / 85
105
106sw.bb:
107  br label %return
108
109sw.bb1:
110  br label %return
111
112return:
113  %retval.0 = phi i32 [ 5, %sw.bb1 ], [ 1, %sw.bb ], [ 0, %entry ]
114  ret i32 %retval.0
115}
116
117!2 = metadata !{metadata !"branch_weights", i32 7, i32 6, i32 4, i32 4, i32 64}
118