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/*
* Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
*
* 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 AVUTIL_ARM_INTMATH_H
#define AVUTIL_ARM_INTMATH_H
#include <stdint.h>
#include "config.h"
#include "libavutil/attributes.h"
#if HAVE_INLINE_ASM
#if HAVE_ARMV6
#define FASTDIV FASTDIV
static av_always_inline av_const int FASTDIV(int a, int b)
{
int r, t;
__asm__ volatile("cmp %3, #2 \n\t"
"ldr %1, [%4, %3, lsl #2] \n\t"
"lsrle %0, %2, #1 \n\t"
"smmulgt %0, %1, %2 \n\t"
: "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
return r;
}
#define av_clip_uint8 av_clip_uint8_arm
static av_always_inline av_const uint8_t av_clip_uint8_arm(int a)
{
unsigned x;
__asm__ volatile ("usat %0, #8, %1" : "=r"(x) : "r"(a));
return x;
}
#define av_clip_int8 av_clip_int8_arm
static av_always_inline av_const uint8_t av_clip_int8_arm(int a)
{
unsigned x;
__asm__ volatile ("ssat %0, #8, %1" : "=r"(x) : "r"(a));
return x;
}
#define av_clip_uint16 av_clip_uint16_arm
static av_always_inline av_const uint16_t av_clip_uint16_arm(int a)
{
unsigned x;
__asm__ volatile ("usat %0, #16, %1" : "=r"(x) : "r"(a));
return x;
}
#define av_clip_int16 av_clip_int16_arm
static av_always_inline av_const int16_t av_clip_int16_arm(int a)
{
int x;
__asm__ volatile ("ssat %0, #16, %1" : "=r"(x) : "r"(a));
return x;
}
#else /* HAVE_ARMV6 */
#define FASTDIV FASTDIV
static av_always_inline av_const int FASTDIV(int a, int b)
{
int r, t;
__asm__ volatile("umull %1, %0, %2, %3"
: "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
return r;
}
#endif /* HAVE_ARMV6 */
#define av_clipl_int32 av_clipl_int32_arm
static av_always_inline av_const int32_t av_clipl_int32_arm(int64_t a)
{
int x, y;
__asm__ volatile ("adds %1, %R2, %Q2, lsr #31 \n\t"
"mvnne %1, #1<<31 \n\t"
"moveq %0, %Q2 \n\t"
"eorne %0, %1, %R2, asr #31 \n\t"
: "=r"(x), "=&r"(y) : "r"(a));
return x;
}
#endif /* HAVE_INLINE_ASM */
#endif /* AVUTIL_ARM_INTMATH_H */
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