mirror of
https://github.com/FFmpeg/FFmpeg.git
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116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/*
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* simple math operations
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* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_ARM_MATHOPS_H
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#define AVCODEC_ARM_MATHOPS_H
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#include <stdint.h>
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#include "libavutil/common.h"
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#if HAVE_INLINE_ASM
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# define MULL MULL
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static inline av_const int MULL(int a, int b, unsigned shift)
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{
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int lo, hi;
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__asm__("smull %0, %1, %2, %3 \n\t"
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"mov %0, %0, lsr %4 \n\t"
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"add %1, %0, %1, lsl %5 \n\t"
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: "=&r"(lo), "=&r"(hi)
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: "r"(b), "r"(a), "ir"(shift), "ir"(32-shift));
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return hi;
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}
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#define MULH MULH
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#if HAVE_ARMV6
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static inline av_const int MULH(int a, int b)
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{
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int r;
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__asm__ ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
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return r;
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}
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#else
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static inline av_const int MULH(int a, int b)
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{
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int lo, hi;
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__asm__ ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));
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return hi;
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}
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#endif
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static inline av_const int64_t MUL64(int a, int b)
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{
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union { uint64_t x; unsigned hl[2]; } x;
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__asm__ ("smull %0, %1, %2, %3"
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: "=r"(x.hl[0]), "=r"(x.hl[1]) : "r"(a), "r"(b));
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return x.x;
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}
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#define MUL64 MUL64
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static inline av_const int64_t MAC64(int64_t d, int a, int b)
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{
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union { uint64_t x; unsigned hl[2]; } x = { d };
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__asm__ ("smlal %0, %1, %2, %3"
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: "+r"(x.hl[0]), "+r"(x.hl[1]) : "r"(a), "r"(b));
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return x.x;
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}
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#define MAC64(d, a, b) ((d) = MAC64(d, a, b))
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#define MLS64(d, a, b) MAC64(d, -(a), b)
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#if HAVE_ARMV5TE
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/* signed 16x16 -> 32 multiply add accumulate */
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# define MAC16(rt, ra, rb) \
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__asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb));
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/* signed 16x16 -> 32 multiply */
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# define MUL16 MUL16
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static inline av_const int MUL16(int ra, int rb)
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{
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int rt;
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__asm__ ("smulbb %0, %1, %2" : "=r"(rt) : "r"(ra), "r"(rb));
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return rt;
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}
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#endif
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#define mid_pred mid_pred
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static inline av_const int mid_pred(int a, int b, int c)
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{
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int m;
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__asm__ volatile (
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"mov %0, %2 \n\t"
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"cmp %1, %2 \n\t"
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"movgt %0, %1 \n\t"
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"movgt %1, %2 \n\t"
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"cmp %1, %3 \n\t"
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"movle %1, %3 \n\t"
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"cmp %0, %1 \n\t"
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"movgt %0, %1 \n\t"
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: "=&r"(m), "+r"(a)
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: "r"(b), "r"(c));
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return m;
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}
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#endif /* HAVE_INLINE_ASM */
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#endif /* AVCODEC_ARM_MATHOPS_H */
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