#include #include #include static long long mpeg3_MMX_601_Y_COEF = 0x0000004000400040; inline void mpeg3_601_mmx(unsigned long y, unsigned long *output) { __asm { /* Output will be 0x00rrggbb */ movd (y), %%mm0; /* Load y 0x00000000000000yy */ /* pmullw mpeg3_MMX_601_Y_COEF, %%mm0; // Scale y 0x00000000000000yy */ psllw $6, %%mm0; /* Shift y coeffs 0x0000yyy0yyy0yyy0 */ movd %%mm0, (output); /* Store output */ } } int main(int argc, char *argv[]) { unsigned char output[1024]; memset(output, 0, 1024); mpeg3_601_mmx(1, (unsigned long*)output); printf("%02x%02x\n", *(unsigned char*)&output[1], *(unsigned char*)&output[0]); }