void ff_put_pixels_clamped_mmx(const DCTELEM *block, uint8_t *pixels, int line_size) { const DCTELEM *p; uint8_t *pix; /* read the pixels */ p = block; pix = pixels; /* unrolled loop */ __asm__ volatile ( "movq %3, %%mm0 \n\t" "movq 8%3, %%mm1 \n\t" "movq 16%3, %%mm2 \n\t" "movq 24%3, %%mm3 \n\t" "movq 32%3, %%mm4 \n\t" "movq 40%3, %%mm5 \n\t" "movq 48%3, %%mm6 \n\t" "movq 56%3, %%mm7 \n\t" "packuswb %%mm1, %%mm0 \n\t" "packuswb %%mm3, %%mm2 \n\t" "packuswb %%mm5, %%mm4 \n\t" "packuswb %%mm7, %%mm6 \n\t" "movq %%mm0, (%0) \n\t" "movq %%mm2, (%0, %1) \n\t" "movq %%mm4, (%0, %1, 2) \n\t" "movq %%mm6, (%0, %2) \n\t" :: "r"(pix), "r"((x86_reg)line_size), "r"((x86_reg)line_size * 3), "m"(*p) : "memory"); pix += line_size * 4; p += 32; // if here would be an exact copy of the code above // compiler would generate some very strange code // thus using "r" __asm__ volatile ( "movq (%3), %%mm0 \n\t" "movq 8(%3), %%mm1 \n\t" "movq 16(%3), %%mm2 \n\t" "movq 24(%3), %%mm3 \n\t" "movq 32(%3), %%mm4 \n\t" "movq 40(%3), %%mm5 \n\t" "movq 48(%3), %%mm6 \n\t" "movq 56(%3), %%mm7 \n\t" "packuswb %%mm1, %%mm0 \n\t" "packuswb %%mm3, %%mm2 \n\t" "packuswb %%mm5, %%mm4 \n\t" "packuswb %%mm7, %%mm6 \n\t" "movq %%mm0, (%0) \n\t" "movq %%mm2, (%0, %1) \n\t" "movq %%mm4, (%0, %1, 2) \n\t" "movq %%mm6, (%0, %2) \n\t" :: "r"(pix), "r"((x86_reg)line_size), "r"((x86_reg)line_size * 3), "r"(p) : "memory"); }