Re: [patch] string.h speedup, cld-2.3.30-A1
Martin Dalecki (dalecki@cs.net.pl)
Mon, 29 Nov 1999 02:56:48 +0100
Linus Torvalds wrote:
>
> On Sat, 27 Nov 1999, Oliver Xymoron wrote:
>
> > On Sat, 27 Nov 1999, Ingo Molnar wrote:
> >
> > > much of the remaining 284 cld's is still unjustified, because '*a = *b;'
> > > type of structure copies are inlined by GCC. (GCC generates a cld because
> > > user-space has to be prepared to be interrupted by uncooperative signal
> > > handlers and the like).
> >
> > What!? A signal handler can change flags? Then there's a lot more for GCC
> > to worry about than the direction flag..
>
> A normal signal handler cannot change flags, because they will obviously
> be restored on signal exit.
>
> However, I'm not sure that "longjmp()" does the same. You'd have to check
> libc souces to see if setjmp saves the flags..
I guess it doesn't do to the condition return on the backjump.
--Marcin
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