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Re: RFA: Fix PR39350

> +@defmac CAN_MOVE_BY_PIECES (@var{size}, @var{alignment})

Again, it is hard to understand the difference without seeing a machine
description usage of this macro.

Besides this, mixing the behavior with and without movmem in a single
macro seems to complicate it.  What about instead a CAN_USE_MOVMEM macro and

  if (consider_movmem && CAN_USE_MOVMEM (size, alignment))
    return true;
  return MOVE_BY_PIECES (size, alignment);

this?

Paolo
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