Re: [xml] RAW && NXT with strncmp()

[Daniel Veillard <veillard redhat com>]

On Wed, Oct 01, 2003 at 06:47:31PM +0200, Bjorn Reese wrote:
> On Wed, 2003-10-01 at 15:50, Daniel Veillard wrote:
>
> >   That I was looking at it this yesterday actually but I don't feel
> > that confident about such a change, yet ...
>
> The libc string functions tend to be highly optimized.

  yeah, I still have a hint from Ulrich Drepper about a way to speed
up the char boundaries test in the internal loop testing CharData,
one day maybe ...

> Time for informal benchmarking...
> [breese stellifer:/home/breese/junk] gcc -O2 compare.c
> [breese stellifer:/home/breese/junk] time ./a.out
> 4.560u 0.040s 0:04.85 94.8%     0+0k 0+0io 65pf+0w
> [breese stellifer:/home/breese/junk] gcc -DUSE_STRNCMP -O2 compare.c
> [breese stellifer:/home/breese/junk] time ./a.out
> 0.930u 0.000s 0:01.03 90.2%     0+0k 0+0io 66pf+0w
>
> I get roughly the same results if I change the content of 'buffer'.

The size gain is less stellar, 8 bytes ...
paphio:~ -> gcc -O2 compare.c
paphio:~ -> nm --print-size -td a.out | grep main
         U __libc_start_main@@GLIBC_2.0
134513396 00000072 T main
paphio:~ -> gcc -DUSE_STRNCMP -O2 compare.c
paphio:~ -> nm --print-size -td a.out | grep main
         U __libc_start_main@@GLIBC_2.0
134513396 00000064 T main
paphio:~ ->

  So Igor, any chance you could do that patch ? Preferably against
CVS or 2.6.0beta3 considering the number of change made since 2.5.11,

  thanks

Daniel

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