_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE native_powr(__CLC_GENTYPE x, __CLC_GENTYPE y) {
  // x^y == 2^{log2 x^y} == 2^{y * log2 x}
  // for x < 0 propagate nan created by log2
  return native_exp2(y * native_log2(x));
}