mathops.h (3806B)
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 27 #include "libavutil/common.h" 28 #include "libavutil/x86/asm.h" 29 30 #if HAVE_INLINE_ASM 31 32 #if ARCH_X86_32 33 34 #define MULL MULL 35 static av_always_inline av_const int MULL(int a, int b, unsigned shift) 36 { 37 int rt, dummy; 38 if (__builtin_constant_p(shift)) 39 __asm__ ( 40 "imull %3 \n\t" 41 "shrdl %4, %%edx, %%eax \n\t" 42 :"=a"(rt), "=d"(dummy) 43 :"a"(a), "rm"(b), "i"(shift & 0x1F) 44 ); 45 else 46 __asm__ ( 47 "imull %3 \n\t" 48 "shrdl %4, %%edx, %%eax \n\t" 49 :"=a"(rt), "=d"(dummy) 50 :"a"(a), "rm"(b), "c"((uint8_t)shift) 51 ); 52 return rt; 53 } 54 55 #define MULH MULH 56 static av_always_inline av_const int MULH(int a, int b) 57 { 58 int rt, dummy; 59 __asm__ ( 60 "imull %3" 61 :"=d"(rt), "=a"(dummy) 62 :"a"(a), "rm"(b) 63 ); 64 return rt; 65 } 66 67 #define MUL64 MUL64 68 static av_always_inline av_const int64_t MUL64(int a, int b) 69 { 70 int64_t rt; 71 __asm__ ( 72 "imull %2" 73 :"=A"(rt) 74 :"a"(a), "rm"(b) 75 ); 76 return rt; 77 } 78 79 #endif /* ARCH_X86_32 */ 80 81 #if HAVE_I686 82 /* median of 3 */ 83 #define mid_pred mid_pred 84 static inline av_const int mid_pred(int a, int b, int c) 85 { 86 int i=b; 87 __asm__ ( 88 "cmp %2, %1 \n\t" 89 "cmovg %1, %0 \n\t" 90 "cmovg %2, %1 \n\t" 91 "cmp %3, %1 \n\t" 92 "cmovl %3, %1 \n\t" 93 "cmp %1, %0 \n\t" 94 "cmovg %1, %0 \n\t" 95 :"+&r"(i), "+&r"(a) 96 :"r"(b), "r"(c) 97 ); 98 return i; 99 } 100 101 #if HAVE_6REGS 102 #define COPY3_IF_LT(x, y, a, b, c, d)\ 103 __asm__ volatile(\ 104 "cmpl %0, %3 \n\t"\ 105 "cmovl %3, %0 \n\t"\ 106 "cmovl %4, %1 \n\t"\ 107 "cmovl %5, %2 \n\t"\ 108 : "+&r" (x), "+&r" (a), "+r" (c)\ 109 : "r" (y), "r" (b), "r" (d)\ 110 ); 111 #endif /* HAVE_6REGS */ 112 113 #endif /* HAVE_I686 */ 114 115 #define MASK_ABS(mask, level) \ 116 __asm__ ("cdq \n\t" \ 117 "xorl %1, %0 \n\t" \ 118 "subl %1, %0 \n\t" \ 119 : "+a"(level), "=&d"(mask)) 120 121 // avoid +32 for shift optimization (gcc should do that ...) 122 #define NEG_SSR32 NEG_SSR32 123 static inline int32_t NEG_SSR32( int32_t a, int8_t s){ 124 if (__builtin_constant_p(s)) 125 __asm__ ("sarl %1, %0\n\t" 126 : "+r" (a) 127 : "i" (-s & 0x1F) 128 ); 129 else 130 __asm__ ("sarl %1, %0\n\t" 131 : "+r" (a) 132 : "c" ((uint8_t)(-s)) 133 ); 134 return a; 135 } 136 137 #define NEG_USR32 NEG_USR32 138 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){ 139 if (__builtin_constant_p(s)) 140 __asm__ ("shrl %1, %0\n\t" 141 : "+r" (a) 142 : "i" (-s & 0x1F) 143 ); 144 else 145 __asm__ ("shrl %1, %0\n\t" 146 : "+r" (a) 147 : "c" ((uint8_t)(-s)) 148 ); 149 return a; 150 } 151 152 #endif /* HAVE_INLINE_ASM */ 153 #endif /* AVCODEC_X86_MATHOPS_H */