| 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 |
| 34 | static 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 |
| 47 | static 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 |
| 59 | static 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 |
| 75 | static 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 |
| 113 | static 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 |
| 122 | static 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 */ |