PICCA Frédéric-Emmanuel <frederic-emmanuel.picca@xxxxxxxxxxxxxxxxxxxxx>
writes:
> so I have written
>
> ALIGN8 short _128mm[] = { 128,128,128,128 };
>
>
> ...
> "movl _128mm@GOTPCREL(%rip),%rax \n"
> "psubw mm2,(%rax) \n"
>
> "psubw mm3,(%rax) \n"
> ...
Note that you're going to need to tell gcc that you're clobbering %rax,
as described in the extended asm documentation.
> but now I have this compilation error
>
> jpeg_color_mmx.cpp: In function ‘void jpeg_yh2v2_to_rgb32_mmx(unsigned char*, long int, unsigned char*)’:
> jpeg_color_mmx.cpp:474: error: invalid 'asm': operand number missing after %-letter
> jpeg_color_mmx.cpp:474: error: invalid 'asm': operand number missing after %-letter
> jpeg_color_mmx.cpp:474: error: invalid 'asm': operand number missing after %-letter
> jpeg_color_mmx.cpp:474: error: invalid 'asm': operand number missing after %-letter
Use %%rax.
Ian
