Re: [patch] string.h speedup, cld-2.3.30-A1
Henrik Olsen (henrik@iaeste.dk)
Sun, 28 Nov 1999 08:51:25 +0100 (CET)
On Sat, 27 Nov 1999, 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..
>
> Linus
Libc longjmp() does, glibc longjmp() doesn't.
--
Henrik Olsen, Dawn Solutions I/S URL=http://www.iaeste.dk/~henrik/
No, power off on shutdown is not SMP safe. It kind of happens to work on
a lot of boards. If making that APM call reformats your disk and plays
tetris on an SMP box, the bios vendor is within spec (if a little
peculiar). Alan Cox, on the Linux Kernel list
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