blob: 51bbd13e83c164a9f1697c534e3439c25e51a4d5 [file] [log] [blame]
Diego Novillode5b8012015-05-07 17:22:06 +00001; RUN: opt < %s -analyze -branch-prob | FileCheck %s
2
3; In this test, the else clause is taken about 90% of the time. This was not
4; reflected in the probability computation because the weight is larger than
5; the branch weight cap (about 2 billion).
6;
Cong Hou15ea0162015-09-25 23:09:59 +00007; CHECK: edge for.body -> if.then probability is 0x0cccba45 / 0x80000000 = 10.00%
8; CHECK: edge for.body -> if.else probability is 0x733345bb / 0x80000000 = 90.00% [HOT edge]
Diego Novillode5b8012015-05-07 17:22:06 +00009
10@y = common global i64 0, align 8
11@x = common global i64 0, align 8
12@.str = private unnamed_addr constant [17 x i8] c"x = %lu\0Ay = %lu\0A\00", align 1
13
14; Function Attrs: inlinehint nounwind uwtable
15define i32 @main() #0 {
16entry:
17 %retval = alloca i32, align 4
18 %i = alloca i64, align 8
19 store i32 0, i32* %retval
20 store i64 0, i64* @y, align 8
21 store i64 0, i64* @x, align 8
22 call void @srand(i32 422304) #3
23 store i64 0, i64* %i, align 8
24 br label %for.cond
25
26for.cond: ; preds = %for.inc, %entry
27 %0 = load i64, i64* %i, align 8
28 %cmp = icmp ult i64 %0, 13000000000
29 br i1 %cmp, label %for.body, label %for.end, !prof !1
30
31for.body: ; preds = %for.cond
32 %call = call i32 @rand() #3
33 %conv = sitofp i32 %call to double
34 %mul = fmul double %conv, 1.000000e+02
35 %div = fdiv double %mul, 0x41E0000000000000
36 %cmp1 = fcmp ogt double %div, 9.000000e+01
37 br i1 %cmp1, label %if.then, label %if.else, !prof !2
38
39if.then: ; preds = %for.body
40 %1 = load i64, i64* @x, align 8
41 %inc = add i64 %1, 1
42 store i64 %inc, i64* @x, align 8
43 br label %if.end
44
45if.else: ; preds = %for.body
46 %2 = load i64, i64* @y, align 8
47 %inc3 = add i64 %2, 1
48 store i64 %inc3, i64* @y, align 8
49 br label %if.end
50
51if.end: ; preds = %if.else, %if.then
52 br label %for.inc
53
54for.inc: ; preds = %if.end
55 %3 = load i64, i64* %i, align 8
56 %inc4 = add i64 %3, 1
57 store i64 %inc4, i64* %i, align 8
58 br label %for.cond
59
60for.end: ; preds = %for.cond
61 %4 = load i64, i64* @x, align 8
62 %5 = load i64, i64* @y, align 8
63 %call5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i32 0, i32 0), i64 %4, i64 %5)
64 ret i32 0
65}
66
67; Function Attrs: nounwind
68declare void @srand(i32) #1
69
70; Function Attrs: nounwind
71declare i32 @rand() #1
72
73declare i32 @printf(i8*, ...) #2
74
75attributes #0 = { inlinehint nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
76attributes #1 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
77attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
78attributes #3 = { nounwind }
79
80!llvm.ident = !{!0}
81
82!0 = !{!"clang version 3.7.0 (trunk 236218) (llvm/trunk 236235)"}
83!1 = !{!"branch_weights", i32 -1044967295, i32 1}
84!2 = !{!"branch_weights", i32 433323762, i32 -394957723}