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[ts-7000] Re: New version cross toolchain for Cygwin

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Subject: [ts-7000] Re: New version cross toolchain for Cygwin
From: "charliem_1216" <>
Date: Tue, 23 Jan 2007 01:10:23 -0000
--- 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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