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#include "libavutil/x86/asm.h" 28 29#if HAVE_INLINE_ASM 30 31#if ARCH_X86_32 32 33#define MULL MULL 34static av_always_inline av_const int MULL(int a, int b, unsigned shift) 35{ 36 int rt, dummy; 37 __asm__ ( 38 "imull %3 \n\t" 39 "shrdl %4, %%edx, %%eax \n\t" 40 :"=a"(rt), "=d"(dummy) 41 :"a"(a), "rm"(b), "ci"((uint8_t)shift) 42 ); 43 return rt; 44} 45 46#define MULH MULH 47static av_always_inline av_const int MULH(int a, int b) 48{ 49 int rt, dummy; 50 __asm__ ( 51 "imull %3" 52 :"=d"(rt), "=a"(dummy) 53 :"a"(a), "rm"(b) 54 ); 55 return rt; 56} 57 58#define MUL64 MUL64 59static av_always_inline av_const int64_t MUL64(int a, int b) 60{ 61 int64_t rt; 62 __asm__ ( 63 "imull %2" 64 :"=A"(rt) 65 :"a"(a), "rm"(b) 66 ); 67 return rt; 68} 69 70#endif /* ARCH_X86_32 */ 71 72#if HAVE_I686 73/* median of 3 */ 74#define mid_pred mid_pred 75static inline av_const int mid_pred(int a, int b, int c) 76{ 77 int i=b; 78 __asm__ ( 79 "cmp %2, %1 \n\t" 80 "cmovg %1, %0 \n\t" 81 "cmovg %2, %1 \n\t" 82 "cmp %3, %1 \n\t" 83 "cmovl %3, %1 \n\t" 84 "cmp %1, %0 \n\t" 85 "cmovg %1, %0 \n\t" 86 :"+&r"(i), "+&r"(a) 87 :"r"(b), "r"(c) 88 ); 89 return i; 90} 91 92#if HAVE_6REGS 93#define COPY3_IF_LT(x, y, a, b, c, d)\ 94__asm__ volatile(\ 95 "cmpl %0, %3 \n\t"\ 96 "cmovl %3, %0 \n\t"\ 97 "cmovl %4, %1 \n\t"\ 98 "cmovl %5, %2 \n\t"\ 99 : "+&r" (x), "+&r" (a), "+r" (c)\ 100 : "r" (y), "r" (b), "r" (d)\ 101); 102#endif /* HAVE_6REGS */ 103#endif /* HAVE_I686 */ 104 105#define MASK_ABS(mask, level) \ 106 __asm__ ("cdq \n\t" \ 107 "xorl %1, %0 \n\t" \ 108 "subl %1, %0 \n\t" \ 109 : "+a"(level), "=&d"(mask)) 110 111// avoid +32 for shift optimization (gcc should do that ...) 112#define NEG_SSR32 NEG_SSR32 113static inline int32_t NEG_SSR32( int32_t a, int8_t s){ 114 __asm__ ("sarl %1, %0\n\t" 115 : "+r" (a) 116 : "ic" ((uint8_t)(-s)) 117 ); 118 return a; 119} 120 121#define NEG_USR32 NEG_USR32 122static inline uint32_t NEG_USR32(uint32_t a, int8_t s){ 123 __asm__ ("shrl %1, %0\n\t" 124 : "+r" (a) 125 : "ic" ((uint8_t)(-s)) 126 ); 127 return a; 128} 129 130#endif /* HAVE_INLINE_ASM */ 131#endif /* AVCODEC_X86_MATHOPS_H */ 132