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/*
* 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 AVUTIL_RISCV_INTMATH_H
#define AVUTIL_RISCV_INTMATH_H
#include <stdint.h>
#include "config.h"
#include "libavutil/attributes.h"
/*
* The compiler is forced to sign-extend the result anyhow, so it is faster to
* compute it explicitly and use it.
*/
#define av_clip_int8 av_clip_int8_rvi
static av_always_inline av_const int8_t av_clip_int8_rvi(int a)
{
union { uint8_t u; int8_t s; } u = { .u = a };
if (a != u.s)
a = ((a >> 31) ^ 0x7F);
return a;
}
#define av_clip_int16 av_clip_int16_rvi
static av_always_inline av_const int16_t av_clip_int16_rvi(int a)
{
union { uint16_t u; int16_t s; } u = { .u = a };
if (a != u.s)
a = ((a >> 31) ^ 0x7FFF);
return a;
}
#define av_clipl_int32 av_clipl_int32_rvi
static av_always_inline av_const int32_t av_clipl_int32_rvi(int64_t a)
{
union { uint32_t u; int32_t s; } u = { .u = a };
if (a != u.s)
a = ((a >> 63) ^ 0x7FFFFFFF);
return a;
}
#define av_clip_intp2 av_clip_intp2_rvi
static av_always_inline av_const int av_clip_intp2_rvi(int a, int p)
{
const int shift = 31 - p;
int b = ((int)(((unsigned)a) << shift)) >> shift;
if (a != b)
b = (a >> 31) ^ ((1 << p) - 1);
return b;
}
#if defined (__riscv_zbb) && (__riscv_zbb > 0) && HAVE_INLINE_ASM
#define av_popcount av_popcount_rvb
static av_always_inline av_const int av_popcount_rvb(uint32_t x)
{
int ret;
#if (__riscv_xlen >= 64)
__asm__ ("cpopw %0, %1\n" : "=r" (ret) : "r" (x));
#else
__asm__ ("cpop %0, %1\n" : "=r" (ret) : "r" (x));
#endif
return ret;
}
#if (__riscv_xlen >= 64)
#define av_popcount64 av_popcount64_rvb
static av_always_inline av_const int av_popcount64_rvb(uint64_t x)
{
int ret;
#if (__riscv_xlen >= 128)
__asm__ ("cpopd %0, %1\n" : "=r" (ret) : "r" (x));
#else
__asm__ ("cpop %0, %1\n" : "=r" (ret) : "r" (x));
#endif
return ret;
}
#endif /* __riscv_xlen >= 64 */
#endif /* __riscv_zbb */
#endif /* AVUTIL_RISCV_INTMATH_H */
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