mathops.h
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上传日期:2022-07-11
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文件大小:2k
- /*
- * simple math operations
- * Copyright (c) 2001, 2002 Fabrice Bellard.
- * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- #ifndef AVCODEC_MATHOPS_H
- #define AVCODEC_MATHOPS_H
- #include "common.h"
- #ifdef ARCH_X86_32
- #include "x86/mathops.h"
- #elif defined(ARCH_ARM)
- #include "arm/mathops.h"
- #elif defined(ARCH_PPC)
- #include "ppc/mathops.h"
- #elif defined(ARCH_BFIN)
- #include "bfin/mathops.h"
- #endif
- /* generic implementation */
- #ifndef MULL
- # define MULL(a,b,s) (((int64_t)(a) * (int64_t)(b)) >> (s))
- #endif
- #ifndef MULH
- //gcc 3.4 creates an incredibly bloated mess out of this
- //# define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32)
- static av_always_inline int MULH(int a, int b){
- return ((int64_t)(a) * (int64_t)(b))>>32;
- }
- #endif
- #ifndef MUL64
- # define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
- #endif
- #ifndef MAC64
- # define MAC64(d, a, b) ((d) += MUL64(a, b))
- #endif
- #ifndef MLS64
- # define MLS64(d, a, b) ((d) -= MUL64(a, b))
- #endif
- /* signed 16x16 -> 32 multiply add accumulate */
- #ifndef MAC16
- # define MAC16(rt, ra, rb) rt += (ra) * (rb)
- #endif
- /* signed 16x16 -> 32 multiply */
- #ifndef MUL16
- # define MUL16(ra, rb) ((ra) * (rb))
- #endif
- #ifndef MLS16
- # define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb))
- #endif
- #endif /* AVCODEC_MATHOPS_H */