unsigned long testit_reg(unsigned long x, unsigned long y)
{
    unsigned long z = x + y;
    unsigned long v;

    asm("# Frame pointer in %[fp]\n\tmov %[in],%[out]"
	: [out] "=r" (v)
	: [in] "r" (z), [fp] "r" (__builtin_frame_address(0)));

    return v;
}

unsigned long testit_buf(unsigned long x, unsigned long y)
{
    unsigned long z = x + y;
    unsigned long buffer[64];

    asm("# Frame pointer in %[fp]\n\tmov %[in],%[out]"
	: [out] "=m" (buffer)
	: [in] "r" (z), [fp] "r" (__builtin_frame_address(0)));

    return buffer[0];
}