1; 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; 7; 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] 9 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} 85