[Bug tree-optimization/101639] New: vectorization with bool reduction

[glisse at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101639

            Bug ID: 101639
           Summary: vectorization with bool reduction
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: glisse at gcc dot gnu.org
  Target Milestone: ---
            Target: x86_64-*-*

bool f(char* p, long n)
{
  bool r = true;
  for(long i = 0; i < n; ++i)
    r &= (p[i] != 0);
  return r;
}

is not vectorized, while if I simply declare r as char instead of bool, it is
(not quite optimal since it fails to pull &1 out of the loop, but that's a
separate issue).