| ; RUN: opt < %s -analyze -branch-prob | FileCheck %s |
| ; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s |
| |
| ; In this test, the else clause is taken about 90% of the time. This was not |
| ; reflected in the probability computation because the weight is larger than |
| ; the branch weight cap (about 2 billion). |
| ; |
| ; CHECK: edge for.body -> if.then probability is 0x0cccba45 / 0x80000000 = 10.00% |
| ; CHECK: edge for.body -> if.else probability is 0x733345bb / 0x80000000 = 90.00% [HOT edge] |
| |
| @y = common global i64 0, align 8 |
| @x = common global i64 0, align 8 |
| @.str = private unnamed_addr constant [17 x i8] c"x = %lu\0Ay = %lu\0A\00", align 1 |
| |
| ; Function Attrs: inlinehint nounwind uwtable |
| define i32 @main() #0 { |
| entry: |
| %retval = alloca i32, align 4 |
| %i = alloca i64, align 8 |
| store i32 0, i32* %retval |
| store i64 0, i64* @y, align 8 |
| store i64 0, i64* @x, align 8 |
| call void @srand(i32 422304) #3 |
| store i64 0, i64* %i, align 8 |
| br label %for.cond |
| |
| for.cond: ; preds = %for.inc, %entry |
| %0 = load i64, i64* %i, align 8 |
| %cmp = icmp ult i64 %0, 13000000000 |
| br i1 %cmp, label %for.body, label %for.end, !prof !1 |
| |
| for.body: ; preds = %for.cond |
| %call = call i32 @rand() #3 |
| %conv = sitofp i32 %call to double |
| %mul = fmul double %conv, 1.000000e+02 |
| %div = fdiv double %mul, 0x41E0000000000000 |
| %cmp1 = fcmp ogt double %div, 9.000000e+01 |
| br i1 %cmp1, label %if.then, label %if.else, !prof !2 |
| |
| if.then: ; preds = %for.body |
| %1 = load i64, i64* @x, align 8 |
| %inc = add i64 %1, 1 |
| store i64 %inc, i64* @x, align 8 |
| br label %if.end |
| |
| if.else: ; preds = %for.body |
| %2 = load i64, i64* @y, align 8 |
| %inc3 = add i64 %2, 1 |
| store i64 %inc3, i64* @y, align 8 |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| br label %for.inc |
| |
| for.inc: ; preds = %if.end |
| %3 = load i64, i64* %i, align 8 |
| %inc4 = add i64 %3, 1 |
| store i64 %inc4, i64* %i, align 8 |
| br label %for.cond |
| |
| for.end: ; preds = %for.cond |
| %4 = load i64, i64* @x, align 8 |
| %5 = load i64, i64* @y, align 8 |
| %call5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i32 0, i32 0), i64 %4, i64 %5) |
| ret i32 0 |
| } |
| |
| ; Function Attrs: nounwind |
| declare void @srand(i32) #1 |
| |
| ; Function Attrs: nounwind |
| declare i32 @rand() #1 |
| |
| declare i32 @printf(i8*, ...) #2 |
| |
| 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" } |
| 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" } |
| 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" } |
| attributes #3 = { nounwind } |
| |
| !llvm.ident = !{!0} |
| |
| !0 = !{!"clang version 3.7.0 (trunk 236218) (llvm/trunk 236235)"} |
| !1 = !{!"branch_weights", i32 -1044967295, i32 1} |
| !2 = !{!"branch_weights", i32 433323762, i32 -394957723} |