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/*
* simple math operations
* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_ARM_MATHOPS_H
#define AVCODEC_ARM_MATHOPS_H
#include <stdint.h>
#include "config.h"
#include "libavutil/common.h"
#if HAVE_INLINE_ASM
#if HAVE_ARMV6
#define MULH MULH
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 FASTDIV FASTDIV
static av_always_inline av_const int FASTDIV(int a, int b)
{
int r;
__asm__ ("cmp %2, #2 \n\t"
"ldr %0, [%3, %2, lsl #2] \n\t"
"ite le \n\t"
"lsrle %0, %1, #1 \n\t"
"smmulgt %0, %0, %1 \n\t"
: "=&r"(r) : "r"(a), "r"(b), "r"(ff_inverse) : "cc");
return r;
}
#else /* HAVE_ARMV6 */
#define FASTDIV FASTDIV
static av_always_inline av_const int FASTDIV(int a, int b)
{
int r, t;
__asm__ ("umull %1, %0, %2, %3"
: "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
return r;
}
#endif
#define MLS64(d, a, b) MAC64(d, -(a), b)
#if HAVE_ARMV5TE
/* signed 16x16 -> 32 multiply add accumulate */
# define MAC16(rt, ra, rb) \
__asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb));
/* signed 16x16 -> 32 multiply */
# define MUL16 MUL16
static inline av_const int MUL16(int ra, int rb)
{
int rt;
__asm__ ("smulbb %0, %1, %2" : "=r"(rt) : "r"(ra), "r"(rb));
return rt;
}
#endif
#define mid_pred mid_pred
static inline av_const int mid_pred(int a, int b, int c)
{
int m;
__asm__ (
"mov %0, %2 \n\t"
"cmp %1, %2 \n\t"
"itt gt \n\t"
"movgt %0, %1 \n\t"
"movgt %1, %2 \n\t"
"cmp %1, %3 \n\t"
"it le \n\t"
"movle %1, %3 \n\t"
"cmp %0, %1 \n\t"
"it gt \n\t"
"movgt %0, %1 \n\t"
: "=&r"(m), "+r"(a)
: "r"(b), "r"(c)
: "cc");
return m;
}
#endif /* HAVE_INLINE_ASM */
#endif /* AVCODEC_ARM_MATHOPS_H */
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