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/*
* Copyright (c) 2017 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <fcntl.h>
#include <unistd.h>
#include <stdint.h>
#include "./vpx_config.h"
#include "vpx_ports/riscv.h"
#if CONFIG_RUNTIME_CPU_DETECT
static int cpu_env_flags(int *flags) {
char *env;
env = getenv("VPX_SIMD_CAPS");
if (env && *env) {
*flags = (int)strtol(env, NULL, 0);
return 0;
}
*flags = 0;
return -1;
}
static int cpu_env_mask(void) {
char *env;
env = getenv("VPX_SIMD_CAPS_MASK");
return env && *env ? (int)strtol(env, NULL, 0) : ~0;
}
int riscv_cpu_caps(void) {
int flags = HAS_RVV;
int mask;
// If VPX_SIMD_CAPS is set then allow only those capabilities.
if (!cpu_env_flags(&flags)) {
return flags;
}
mask = cpu_env_mask();
return flags & mask;
}
#else
// If there is no RTCD the function pointers are not used and can not be
// changed.
int riscv_cpu_caps(void) { return 0; }
#endif // CONFIG_RUNTIME_CPU_DETECT
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