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Re: [PATCH] Disallow side-effects in inline asm operands unless (a new) _ constraint modifier is used (PR middle-end/44492)
On Sun, Jun 20, 2010 at 12:29:30AM -0400, Hans-Peter Nilsson wrote:
> On Fri, 11 Jun 2010, Jakub Jelinek wrote:
> > --- gcc/recog.c.jj 2010-06-10 19:32:00.000000000 +0200
> > +++ gcc/recog.c 2010-06-11 10:14:55.000000000 +0200
> > @@ -1629,6 +1632,12 @@ asm_operand_ok (rtx op, const char *cons
> > case '?':
> > break;
> >
> > + case '_':
> > +#ifdef AUTO_INC_DEC
> > + incdec_ok = true;
>
> ...please, also set incdec_ok = 1 for '<' and '>'.
Yeah, I can do that.
> (FWIW, I don't mind if you drop that new '_', it just looks
> weird and wasting one good letter.)
_ isn't redundant, < and > require PRE/POST_DEC/INC,
while _ allows it but doesn't require (and, allows also PRE/POST_MODIFY).
Jakub