RE: [arm-gnu] Assembler error for Inline Assembly (cortex-A8 processor)

["Shilimkar, Santosh" <santosh.shilimkar@xxxxxx>]

> -----Original Message-----
> From: Carlos O'Donell [mailto:carlos@xxxxxxxxxxxxxxxx] 
> Sent: Monday, November 24, 2008 8:08 PM
> To: akshay.joshi@xxxxxxxxxxx
> Cc: Shilimkar, Santosh; arm-gnu@xxxxxxxxxxxxxxxx
> Subject: Re: [arm-gnu] Assembler error for Inline Assembly 
> (cortex-A8 processor)
> 
> Joshi Akshay wrote:
> >         void func( )
> > 
> >         {
> > 
> >          __asm__ __volatile__(
> > 
> >         "        vadd.s32      d0, d0\n"
> > 
> >         "        vld1.32       d0[], [r7]!\n"
> > 
> >         "        vadd.s32      d0, d0\n"
> >         "        vzip.s32      d8, d8\n");
> > 
> >         }
> 
> You must specify the correct asm contraints.
> 
> This asm statement writes to d0, d8, and reads from r7, but does not 
> specify any input or output operands. This function will not operate 
> correctly if it is inlined into other code.
> 
> Please see the GCC manual for an example of how to use asm contraints 
> i.e. input, output and clobber operands in assembly.
> 
> http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Extended-Asm.html#
> Extended-Asm
> http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Constraints.html#i
> ndex-g_t_0040code_007basm_007d-constraints-2247
> 
> An alternative may be to declare the function naked.
> 

This example was given just for the syntactical errors. This is dummy one I wrote to highlight the syntax. Infact a void function and not returning anythings doesn't make sense anyways.