On Wed, Oct 08, 2014 at 02:56:46PM +0800, Thomas Preud'homme wrote:
> > From: gcc-patches-ow...@gcc.gnu.org [mailto:gcc-patches-
> > ow...@gcc.gnu.org] On Behalf Of Thomas Preud'homme
> > Sent: Wednesday, October 08, 2014 2:43 PM
> > > Also, perhaps you could short-circuit this if the rotation isn't by
> > > constant
>
> Note that do_shift_rotate already check for this. Is it enough?
The question is only about the compile time cost needed through all the
routines find_bswap_or_nop calls before it finds out it can't do anything
with the rotate, the short-circuiting could avoid that. E.g.
find_bswap_or_nop_1 first recurses on the argument etc.
Jakub
