[Bug tree-optimization/96599] New: Failure to optimize self-stpcpy to strlen

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96599

            Bug ID: 96599
           Summary: Failure to optimize self-stpcpy to strlen
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gabravier at gmail dot com
  Target Milestone: ---

char *f(char *a)
{
    return stpcpy(a, a);
}

This can be optimized to `strlen(a) + a`. This transformation is done by LLVM,
but not by GCC.