blob: 56035f85562e3603d8c9a765a6deb2c565c03deb [file] [log] [blame]
/*
* 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 <stddef.h>
#include "libavutil/cpu.h"
#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
#endif