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Re: GCC Tests For ARM/Neon

On Wednesday 06 August 2008, Joseph S. Myers wrote:
> On Wed, 6 Aug 2008, Joel Sherrill wrote:
> > $ arm-rtems4.9-gcc  -mfpu=neon -mfloat-abi=softfp -mcpu=arm7tdmi -c
> > test_neon.c /tmp/ccBzigjD.s: Assembler messages:
> > /tmp/ccBzigjD.s:13: Error: selected processor does not support `vldr
> > d18,[fp,#-32]'
> >
> >
> > So with that combination of options gcc defines __ARM_NEON__.
> > And gas ends up knowing the instructions are invalid.
>
> The compiler generates
>
>         .cpu arm7tdmi
>         .fpu neon
>
> for this example.

Oh, I bet this is a crufty old target that doesn't use the .cpu/.fpu 
directives. The gcc driver is almost certainly passing the wrong set of 
commandline options to the the assembler.  I find it hard to care about 
non-eabi targets nowadays.

Paul
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