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_ARM_MATHOPS_H 23#define AVCODEC_ARM_MATHOPS_H 24 25#include <stdint.h> 26#include "libavutil/common.h" 27 28# define MULL MULL 29static inline av_const int MULL(int a, int b, unsigned shift) 30{ 31 int lo, hi; 32 __asm__("smull %0, %1, %2, %3 \n\t" 33 "mov %0, %0, lsr %4 \n\t" 34 "add %1, %0, %1, lsl %5 \n\t" 35 : "=&r"(lo), "=&r"(hi) 36 : "r"(b), "r"(a), "ir"(shift), "ir"(32-shift)); 37 return hi; 38} 39 40#define MULH MULH 41#if HAVE_ARMV6 42static inline av_const int MULH(int a, int b) 43{ 44 int r; 45 __asm__ ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b)); 46 return r; 47} 48#else 49static inline av_const int MULH(int a, int b) 50{ 51 int lo, hi; 52 __asm__ ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a)); 53 return hi; 54} 55#endif 56 57static inline av_const int64_t MUL64(int a, int b) 58{ 59 union { uint64_t x; unsigned hl[2]; } x; 60 __asm__ ("smull %0, %1, %2, %3" 61 : "=r"(x.hl[0]), "=r"(x.hl[1]) : "r"(a), "r"(b)); 62 return x.x; 63} 64#define MUL64 MUL64 65 66static inline av_const int64_t MAC64(int64_t d, int a, int b) 67{ 68 union { uint64_t x; unsigned hl[2]; } x = { d }; 69 __asm__ ("smlal %0, %1, %2, %3" 70 : "+r"(x.hl[0]), "+r"(x.hl[1]) : "r"(a), "r"(b)); 71 return x.x; 72} 73#define MAC64(d, a, b) ((d) = MAC64(d, a, b)) 74#define MLS64(d, a, b) MAC64(d, -(a), b) 75 76#if HAVE_ARMV5TE 77 78/* signed 16x16 -> 32 multiply add accumulate */ 79# define MAC16(rt, ra, rb) \ 80 __asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb)); 81 82/* signed 16x16 -> 32 multiply */ 83# define MUL16 MUL16 84static inline av_const int MUL16(int ra, int rb) 85{ 86 int rt; 87 __asm__ ("smulbb %0, %1, %2" : "=r"(rt) : "r"(ra), "r"(rb)); 88 return rt; 89} 90 91#endif 92 93#define mid_pred mid_pred 94static inline av_const int mid_pred(int a, int b, int c) 95{ 96 int m; 97 __asm__ volatile ( 98 "mov %0, %2 \n\t" 99 "cmp %1, %2 \n\t" 100 "movgt %0, %1 \n\t" 101 "movgt %1, %2 \n\t" 102 "cmp %1, %3 \n\t" 103 "movle %1, %3 \n\t" 104 "cmp %0, %1 \n\t" 105 "movgt %0, %1 \n\t" 106 : "=&r"(m), "+r"(a) 107 : "r"(b), "r"(c)); 108 return m; 109} 110 111#endif /* AVCODEC_ARM_MATHOPS_H */ 112