1/* 2 * simple math operations 3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVCODEC_X86_MATHOPS_H 23#define AVCODEC_X86_MATHOPS_H 24 25#include "config.h" 26#include "libavutil/common.h" 27 28#if ARCH_X86_32 29#define MULL(ra, rb, shift) \ 30 ({ int rt, dummy; __asm__ (\ 31 "imull %3 \n\t"\ 32 "shrdl %4, %%edx, %%eax \n\t"\ 33 : "=a"(rt), "=d"(dummy)\ 34 : "a" ((int)(ra)), "rm" ((int)(rb)), "i"(shift));\ 35 rt; }) 36 37#define MULH(ra, rb) \ 38 ({ int rt, dummy;\ 39 __asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)(ra)), "rm" ((int)(rb)));\ 40 rt; }) 41 42#define MUL64(ra, rb) \ 43 ({ int64_t rt;\ 44 __asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)(ra)), "g" ((int)(rb)));\ 45 rt; }) 46#endif 47 48#if HAVE_CMOV 49/* median of 3 */ 50#define mid_pred mid_pred 51static inline av_const int mid_pred(int a, int b, int c) 52{ 53 int i=b; 54 __asm__ volatile( 55 "cmp %2, %1 \n\t" 56 "cmovg %1, %0 \n\t" 57 "cmovg %2, %1 \n\t" 58 "cmp %3, %1 \n\t" 59 "cmovl %3, %1 \n\t" 60 "cmp %1, %0 \n\t" 61 "cmovg %1, %0 \n\t" 62 :"+&r"(i), "+&r"(a) 63 :"r"(b), "r"(c) 64 ); 65 return i; 66} 67#endif 68 69#if HAVE_CMOV 70#define COPY3_IF_LT(x, y, a, b, c, d)\ 71__asm__ volatile(\ 72 "cmpl %0, %3 \n\t"\ 73 "cmovl %3, %0 \n\t"\ 74 "cmovl %4, %1 \n\t"\ 75 "cmovl %5, %2 \n\t"\ 76 : "+&r" (x), "+&r" (a), "+r" (c)\ 77 : "r" (y), "r" (b), "r" (d)\ 78); 79#endif 80 81// avoid +32 for shift optimization (gcc should do that ...) 82#define NEG_SSR32 NEG_SSR32 83static inline int32_t NEG_SSR32( int32_t a, int8_t s){ 84 __asm__ ("sarl %1, %0\n\t" 85 : "+r" (a) 86 : "ic" ((uint8_t)(-s)) 87 ); 88 return a; 89} 90 91#define NEG_USR32 NEG_USR32 92static inline uint32_t NEG_USR32(uint32_t a, int8_t s){ 93 __asm__ ("shrl %1, %0\n\t" 94 : "+r" (a) 95 : "ic" ((uint8_t)(-s)) 96 ); 97 return a; 98} 99 100#endif /* AVCODEC_X86_MATHOPS_H */ 101