[Bug tree-optimization/108997] New: GCC prediction on bool comparisons seems wrong

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108997

            Bug ID: 108997
           Summary: GCC prediction on bool comparisons seems wrong
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

I noticed this while looking into 108992.
I suspect we look into this but I am not 100% sure this is a bug.
Testcase:
void use(int *);
void use2(int *);

void foo(bool cond, int * p)
{
    if (cond) {
        use(p);
    }
    use2(p);
}

GCC predicts the branch to be taken 66% of the time, but I would have assume it
should be 50% as it is a bool and there is no other information. I suspect this
is due to prediction when comparing against 0.