This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: Making rtxes use less memory (sometimes!)
"Zack Weinberg" <zack@codesourcery.com> writes:
> Richard Sandiford <rsandifo@redhat.com> writes:
> > Here's the sort of speed-up I get when compiling mips.i
> > using a mips64-linux-gnu native:
> >
> > -O0
> > before after
> > real 0m31.478s 0m29.830s
> > user 0m31.270s 0m29.670s
> > sys 0m0.200s 0m0.130s
> >
> > -O1
> > before after
> > real 0m16.364s 0m15.465s
> > user 0m16.220s 0m15.270s
> > sys 0m0.140s 0m0.190s
> >
> > -O2
> > before after
> > real 0m7.804s 0m7.104s
> > user 0m7.690s 0m7.030s
> > sys 0m0.100s 0m0.070s
> >
> > (these are reproducable to within ~0.1s).
>
> Do you have the -O numbers backward? It seems odd that -O0 would be
> four times slower than -O2.
Doh! You're right, of course.
> This is OK.
Applied, thanks.
Richard