riscv_cpudetect.c - mozsearch

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/*

 * Copyright (c) 2025, Alliance for Open Media. All rights reserved.

 * This source code is subject to the terms of the BSD 2 Clause License and

 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License

 * was not distributed with this source code in the LICENSE file, you can

 * obtain it at www.aomedia.org/license/software. If the Alliance for Open

 * Media Patent License 1.0 was not distributed with this source code in the

 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.

*/

#include <fcntl.h>

#include <unistd.h>

#include <stdint.h>

#include "config/aom_config.h"

#include "aom_ports/riscv.h"

#if CONFIG_RUNTIME_CPU_DETECT

#include <sys/auxv.h>

#define HWCAP_RVV (1 << ('v' - 'a'))

int riscv_simd_caps(void) {

  int flags = 0;

#if HAVE_RVV

  unsigned long hwcap = getauxval(AT_HWCAP);

  if (hwcap & HWCAP_RVV) flags |= HAS_RVV;

#endif

  return flags;

#else

// If there is no RTCD the function pointers are not used and can not be

// changed.

int riscv_simd_caps(void) { return 0; }

#endif  // CONFIG_RUNTIME_CPU_DETECT