mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-24 00:02:52 +00:00
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
|
|
* Copyright © 2022 Rémi Denis-Courmont.
|
|
*
|
|
* 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_CPU_H
|
|
#define AVUTIL_RISCV_CPU_H
|
|
|
|
#include "config.h"
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
#include "libavutil/attributes_internal.h"
|
|
#include "libavutil/cpu.h"
|
|
|
|
#ifndef __riscv_zbb
|
|
extern attribute_visibility_hidden bool ff_rv_zbb_supported;
|
|
#endif
|
|
|
|
static inline av_const bool ff_rv_zbb_support(void)
|
|
{
|
|
#ifndef __riscv_zbb
|
|
return ff_rv_zbb_supported;
|
|
#else
|
|
return true;
|
|
#endif
|
|
}
|
|
|
|
#if HAVE_RVV
|
|
/**
|
|
* Returns the vector size in bytes (always a power of two and at least 4).
|
|
* This is undefined behaviour if vectors are not implemented.
|
|
*/
|
|
static inline size_t ff_get_rv_vlenb(void)
|
|
{
|
|
size_t vlenb;
|
|
|
|
__asm__ (
|
|
".option push\n"
|
|
".option arch, +v\n"
|
|
" csrr %0, vlenb\n"
|
|
".option pop\n" : "=r" (vlenb));
|
|
return vlenb;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Checks that the vector bit-size is at least the given value.
|
|
* This is potentially undefined behaviour if vectors are not implemented.
|
|
*/
|
|
static inline bool ff_rv_vlen_least(unsigned int bits)
|
|
{
|
|
#ifdef __riscv_v_min_vlen
|
|
if (bits <= __riscv_v_min_vlen)
|
|
return true;
|
|
#else
|
|
/*
|
|
* Vector lengths smaller than 128 bits are only possible in embedded cases
|
|
* and cannot be run-time detected, so we can assume 128 bits at least.
|
|
*/
|
|
if (bits <= 128)
|
|
return true;
|
|
#endif
|
|
return bits <= (8 * ff_get_rv_vlenb());
|
|
}
|
|
#endif
|