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libavutil/arm/intmath.h

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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 */

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