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Re: Poor execution speeds using -mno-cygwin g77 option
On Sat, 19 Jun 2004, Reini Urban wrote:
> Igor Pechtchanski schrieb:
> > On Fri, 18 Jun 2004, Douglas A. Vechinski wrote:
> >>To my knowledge, I'm not using floating point emulation. But if I was,
> >>how would I be able to check?
> >
> > Actually, my WAG may turn out to be right after all. Check the default
> > target architecture (processor) for both Linux and Cygwin -- you might
> > find that the default target for Cygwin is i386, and for Linux it's
> > something like i686/pentiumpro.
>
> No:
> gcc -dumpmachine => i686-pc-cygwin (for v3.3.1 and v2.95.2-5)
> For -mno-cygwin also.
>
> v2.95.2-5:
> *cpp_cpu_default:
> %(cpp_686)
Having little experience reading the specs files (and the output of
-dumpspecs) seems to have lead me astray. I still think it may be a good
idea to ensure hardware fp by using -mhard-float explicitly (and perhaps
other options, like -march=i686). If someone knows a way to find out
exactly what all of the default options are, please follow up in this
thread. Thanks,
Igor
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