[Bug tree-optimization/96692] New: Failure to optimize xor+or+xor to andnot+xor

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96692

            Bug ID: 96692
           Summary: Failure to optimize xor+or+xor to andnot+xor
           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, int c)
{
    return (a ^ b) ^ (a | c);
}

This can be optimized to `return (c & ~a) ^ b;`. This transformation is done by
LLVM, but not by GCC.