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/*
* simple math operations
* 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_ARMV4L_MATHOPS_H
#define AVCODEC_ARMV4L_MATHOPS_H
#ifdef FRAC_BITS
# define MULL(a, b) \
({ int lo, hi;\
asm("smull %0, %1, %2, %3 \n\t"\
"mov %0, %0, lsr %4\n\t"\
"add %1, %0, %1, lsl %5\n\t"\
: "=&r"(lo), "=&r"(hi)\
: "r"(b), "r"(a), "i"(FRAC_BITS), "i"(32-FRAC_BITS));\
hi; })
#endif
#ifdef HAVE_ARMV6
static inline av_const int MULH(int a, int b)
{
int r;
asm ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
return r;
}
#define MULH MULH
#else
#define MULH(a, b) \
({ int lo, hi;\
asm ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));\
hi; })
#endif
static inline av_const int64_t MUL64(int a, int b)
{
union { uint64_t x; unsigned hl[2]; } x;
asm ("smull %0, %1, %2, %3"
: "=r"(x.hl[0]), "=r"(x.hl[1]) : "r"(a), "r"(b));
return x.x;
}
#define MUL64 MUL64
static inline av_const int64_t MAC64(int64_t d, int a, int b)
{
union { uint64_t x; unsigned hl[2]; } x = { d };
asm ("smlal %0, %1, %2, %3"
: "+r"(x.hl[0]), "+r"(x.hl[1]) : "r"(a), "r"(b));
return x.x;
}
#define MAC64(d, a, b) ((d) = MAC64(d, a, b))
#define MLS64(d, a, b) MAC64(d, -(a), b)
#if defined(HAVE_ARMV5TE)
/* signed 16x16 -> 32 multiply add accumulate */
# define MAC16(rt, ra, rb) \
asm ("smlabb %0, %2, %3, %0" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
/* signed 16x16 -> 32 multiply */
# define MUL16(ra, rb) \
({ int __rt; \
asm ("smulbb %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb)); \
__rt; })
#endif
#endif /* AVCODEC_ARMV4L_MATHOPS_H */
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