Libav
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00001 /* 00002 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com> 00003 * 00004 * This file is part of FFmpeg. 00005 * 00006 * FFmpeg is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * FFmpeg is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with FFmpeg; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 00021 #ifndef AVUTIL_ARM_INTMATH_H 00022 #define AVUTIL_ARM_INTMATH_H 00023 00024 #include "config.h" 00025 #include "libavutil/attributes.h" 00026 00027 #if HAVE_INLINE_ASM 00028 00029 #if HAVE_ARMV6 00030 static inline av_const int FASTDIV(int a, int b) 00031 { 00032 int r, t; 00033 __asm__ volatile("cmp %3, #2 \n\t" 00034 "ldr %1, [%4, %3, lsl #2] \n\t" 00035 "lsrle %0, %2, #1 \n\t" 00036 "smmulgt %0, %1, %2 \n\t" 00037 : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse)); 00038 return r; 00039 } 00040 #else 00041 static inline av_const int FASTDIV(int a, int b) 00042 { 00043 int r, t; 00044 __asm__ volatile("umull %1, %0, %2, %3" 00045 : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b])); 00046 return r; 00047 } 00048 #endif 00049 00050 #define FASTDIV FASTDIV 00051 00052 #endif /* HAVE_INLINE_ASM */ 00053 00054 #endif /* AVUTIL_ARM_INTMATH_H */