--- In Jim Jackson <> wrote:
>
> > On Mon, 22 Jan 2007, James wrote:
> >
> > gcc-3.3.4 do not support Crunch (the hardware floating point, I need
> > to use the Crunch co-processor )! gcc-3.4 or better have the option
> > -mcpu=ep9312
But AFAIK, the 2.4 kernel from TS does not know about preserving
crunch registers across task switches, so you risk corruption, even if
you get your program to compile & run.
>
> Ah. ok. I won't ask why you need floating point[1] :-)
> Anyway good luck.
>
> Jim
>
> [1] but I've come across a lot of people who think they MUST use
> floating point to do arithmetic, but, with an intelligent approach could
> use integer operations only.
With the upcoming debian eabi work, you can get much better floating
point even without crunch (ye old Whetstone FP test):
2.4.26ts11 2.6.20rc5 2.6.20-eabi 2.6.20-eabi
no-crunch w/crunch
Whets/sec 926 KIPS 406 KIPS 5900 KIPS 8100 KIPS
Some of this comes from using -msoftfloat rather than the FPA
instructions emulated by instruction faults in the kernel. See
http://wiki.debian.org/ArmEabiPort for more eabi info.
IMHO, This could be added to the list of 'pros' for looking toward 2.6
kernels recently discussed on this list.
Regards, ........ Charlie
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