1 ; RUN: opt < %s -analyze -branch-prob | FileCheck %s 2 ; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s 3 4 ; In this test, the else clause is taken about 90% of the time. This was not 5 ; reflected in the probability computation because the weight is larger than 6 ; the branch weight cap (about 2 billion). 7 ; 8 ; CHECK: edge for.body -> if.then probability is 0x0cccba45 / 0x80000000 = 10.00% 9 ; CHECK: edge for.body -> if.else probability is 0x733345bb / 0x80000000 = 90.00% [HOT edge] 10 11 @y = common global i64 0, align 8 12 @x = common global i64 0, align 8 13 @.str = private unnamed_addr constant [17 x i8] c"x = %lu\0Ay = %lu\0A\00", align 1 14 15 ; Function Attrs: inlinehint nounwind uwtable 16 define i32 @main() #0 { 17 entry: 18 %retval = alloca i32, align 4 19 %i = alloca i64, align 8 20 store i32 0, i32* %retval 21 store i64 0, i64* @y, align 8 22 store i64 0, i64* @x, align 8 23 call void @srand(i32 422304) #3 24 store i64 0, i64* %i, align 8 25 br label %for.cond 26 27 for.cond: ; preds = %for.inc, %entry 28 %0 = load i64, i64* %i, align 8 29 %cmp = icmp ult i64 %0, 13000000000 30 br i1 %cmp, label %for.body, label %for.end, !prof !1 31 32 for.body: ; preds = %for.cond 33 %call = call i32 @rand() #3 34 %conv = sitofp i32 %call to double 35 %mul = fmul double %conv, 1.000000e+02 36 %div = fdiv double %mul, 0x41E0000000000000 37 %cmp1 = fcmp ogt double %div, 9.000000e+01 38 br i1 %cmp1, label %if.then, label %if.else, !prof !2 39 40 if.then: ; preds = %for.body 41 %1 = load i64, i64* @x, align 8 42 %inc = add i64 %1, 1 43 store i64 %inc, i64* @x, align 8 44 br label %if.end 45 46 if.else: ; preds = %for.body 47 %2 = load i64, i64* @y, align 8 48 %inc3 = add i64 %2, 1 49 store i64 %inc3, i64* @y, align 8 50 br label %if.end 51 52 if.end: ; preds = %if.else, %if.then 53 br label %for.inc 54 55 for.inc: ; preds = %if.end 56 %3 = load i64, i64* %i, align 8 57 %inc4 = add i64 %3, 1 58 store i64 %inc4, i64* %i, align 8 59 br label %for.cond 60 61 for.end: ; preds = %for.cond 62 %4 = load i64, i64* @x, align 8 63 %5 = load i64, i64* @y, align 8 64 %call5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i32 0, i32 0), i64 %4, i64 %5) 65 ret i32 0 66 } 67 68 ; Function Attrs: nounwind 69 declare void @srand(i32) #1 70 71 ; Function Attrs: nounwind 72 declare i32 @rand() #1 73 74 declare i32 @printf(i8*, ...) #2 75 76 attributes #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" } 77 attributes #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" } 78 attributes #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" } 79 attributes #3 = { nounwind } 80 81 !llvm.ident = !{!0} 82 83 !0 = !{!"clang version 3.7.0 (trunk 236218) (llvm/trunk 236235)"} 84 !1 = !{!"branch_weights", i32 -1044967295, i32 1} 85 !2 = !{!"branch_weights", i32 433323762, i32 -394957723} 86
