[Bug middle-end/98710] New: missing optimization (x | c) & ~(y | c) -> x & ~(y | c)

[vanyacpp at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98710

            Bug ID: 98710
           Summary: missing optimization (x | c) & ~(y | c) -> x & ~(y |
                    c)
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vanyacpp at gmail dot com
  Target Milestone: ---

On this function clang generates slightly shorter code

unsigned foo(unsigned x, unsigned y, unsigned c)
{
    return (x | c) & ~(y | c);
}

because it notices that the expression can be simplified to x & ~(y | c). It
would be great if GCC can do the same.

https://godbolt.org/z/3ob6eb