x86.h

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/*
 * Copyright © 2025, Niklas Haas
 * Copyright © 2018, VideoLAN and dav1d authors
 * Copyright © 2018, Two Orioles, LLC
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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#ifndef CHECKASM_PERF_X86_H
#define CHECKASM_PERF_X86_H
 
#include <stdint.h>
 
#if defined(_MSC_VER) && !defined(__clang__)
  #include <intrin.h>
  #define checkasm_rdtsc() (_mm_lfence(), __rdtsc())
#else
static inline uint64_t checkasm_rdtsc(void)
{
    uint32_t eax, edx;
    __asm__ __volatile__("lfence\nrdtsc" : "=a"(eax), "=d"(edx));
    return (((uint64_t) edx) << 32) | eax;
}
#endif
 
#define CHECKASM_PERF_ASM()      checkasm_rdtsc()
#define CHECKASM_PERF_ASM_NAME   "x86 (rdtsc)"
#define CHECKASM_PERF_ASM_UNIT   "cycle"
#define CHECKASM_PERF_ASM_USABLE 1
 
#endif /* CHECKASM_PERF_X86_H */