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

[Carlos O'Donell <carlos@xxxxxxxxxxxxxxxx>]

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#index-g_t_0040code_007basm_007d-constraints-2247

An alternative may be to declare the function naked.

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