This is the mail archive of the
libc-alpha@sources.redhat.com
mailing list for the glibc project.
Re: Should we optimize memset to bzero?
On Fri, Nov 02, 2001 at 05:59:05PM +0100, Jakub Jelinek wrote:
> On Fri, Nov 02, 2001 at 08:51:39AM -0800, H . J . Lu wrote:
> > Do we have any ideas when gcc will inline __builtin_memset(s,0,n)? I don't
> > believe gcc will inline it if `n' is not a small constant. Can we guess what
> > that small constant is?
>
> Depends on exactly what processor you're compiling for.
> Look at gcc/expr.c (clear_storage) for all the glory details.
> You really don't want to have all this knowledge in glibc headers,
> especially when it is changing all the time.
>
I doubt gcc will ever inline it if `n' is a variable. It is also very
unlikely for a big constant, like 256.
H.J.