On Tue, Apr 21, 2015 at 12:27:40AM +0200, Steven Bosscher wrote: > On Mon, Apr 20, 2015 at 10:11 PM, Vladimir Makarov wrote: > > I might be wrong but I think you have a bloated code because you use > > scratches. I already told several times that usage of scratch is always a > > bad idea. It was a bad idea for an old RA and is still a bad idea for IRA. > > The usage of scratches should be prohibited, probably we should write it > > somewhere. It is better to use just a regular pseudo instead. > > Thanks Vladimir, I didn't know this. > Does this mean that, for example, extendsidi in i386.md would be > better if it did not use match_scratch?
The combiner can add or remove clobbers of scratches whenever needed, but it cannot do that for clobbers of pseudos. Segher
