Re: [arm-gnu] urgent toolchain

[Carlos O'Donell <carlos@xxxxxxxxxxxxxxxx>]

Gilles Chanteperdrix wrote:
> > Using "-mfpu=vfp -mfloat-abi=softfp" instead of "-msoft-float" will 
> > enable VFP hardware floating-point code-generation for your program. The 
> > run-time libraries will still use software floating-point. Routines 
> > compiled for VFP are compatible with software floating-point.
> It looks like run-time libraries do contain some FP code. Here is an
> excerpt of disassembling
> arm-2007q3/arm-none-linux-gnueabi/libc/lib/libc-2.5.so:
The run-time may contain VFP instructions as long as they are never 
executed on hardware that does not have a VFP.
>    29b10:	0a000002 	beq	29b20 <Lno_vfp>
>    29b14:	ecac8b11 	fstmiax	ip!, {d8-d15}
>    29b18:	eef12a10 	fmrx	r2, fpscr
>    29b1c:	e48c2004 	str	r2, [ip], #4
The GNU C Library contains run-time CPU feature detection. The 'beq' 
instruction will check the variable "no_vfp" (No VFP available) and skip 
the VFP instructions on non-VFP hardware.
Are you having a problem with this?

Cheers,
Carlos.
--
Carlos O'Donell
CodeSourcery
carlos@xxxxxxxxxxxxxxxx
(650) 331-3385 x716