[Bug tree-optimization/94919] New: Failure to recognize max pattern

gabravier at gmail dot com gcc-bugzilla@gcc.gnu.org
Sat May 2 09:51:38 GMT 2020


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94919

            Bug ID: 94919
           Summary: Failure to recognize max pattern
           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 x, int y)
{
    return ((x ^ y) & -(x >= y)) ^ y;
}

This can be optimized to `x >= y ? x : y`. LLVM makes this transformation, but
GCC does not.


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