[Bug tree-optimization/95176] New: Failure to optimize division followed by multiplication to modulo followed by subtraction

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95176

            Bug ID: 95176
           Summary: Failure to optimize division followed by
                    multiplication to modulo followed by subtraction
           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: ---

int f(int a, int b)
{
    return a * (b / a);
}

This is equivalent to `return b - (b % a);`. This transformation is done by
LLVM, but not by GCC.