1/* 2 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#ifndef AVUTIL_ARM_INTMATH_H 22#define AVUTIL_ARM_INTMATH_H 23 24#include "config.h" 25#include "libavutil/attributes.h" 26 27#if HAVE_INLINE_ASM 28 29#if HAVE_ARMV6 30static inline av_const int FASTDIV(int a, int b) 31{ 32 int r, t; 33 __asm__ volatile("cmp %3, #2 \n\t" 34 "ldr %1, [%4, %3, lsl #2] \n\t" 35 "lsrle %0, %2, #1 \n\t" 36 "smmulgt %0, %1, %2 \n\t" 37 : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse)); 38 return r; 39} 40#else 41static inline av_const int FASTDIV(int a, int b) 42{ 43 int r, t; 44 __asm__ volatile("umull %1, %0, %2, %3" 45 : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b])); 46 return r; 47} 48#endif 49 50#define FASTDIV FASTDIV 51 52#endif /* HAVE_INLINE_ASM */ 53 54#endif /* AVUTIL_ARM_INTMATH_H */ 55