tracktion_CPU.h

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 /*
    ,--.                     ,--.     ,--.  ,--.
  ,-'  '-.,--.--.,--,--.,---.|  |,-.,-'  '-.`--' ,---. ,--,--,      Copyright 2024
  '-.  .-'|  .--' ,-.  | .--'|     /'-.  .-',--.| .-. ||      \   Tracktion Software
    |  |  |  |  \ '-'  \ `--.|  \  \  |  |  |  |' '-' '|  ||  |       Corporation
    `---' `--'   `--`--'`---'`--'`--' `---' `--' `---' `--''--'    www.tracktion.com
 
    Tracktion Engine uses a GPL/commercial licence - see LICENCE.md for details.
*/
 
#pragma once
 
#ifdef _WIN32
 #include <intrin.h>
#elif defined (__arm__) || defined (__arm64__) || defined (__aarch64__)
 // Use clang built-in
#else
 #include <x86intrin.h>
#endif
 
#if defined (__arm__) || defined (__arm64__) || defined (__aarch64__)
 // Use asm yield
#elif __has_include(<emmintrin.h>)
 #include <emmintrin.h>
#endif
 
namespace tracktion { inline namespace core
{
 
inline std::uint64_t rdtsc()
{
   #if defined (__arm__) || defined (__aarch64__) || (defined (__arm64__) && defined (__APPLE__))
    std::uint64_t result;
    __asm __volatile("mrs %0, CNTVCT_EL0" : "=&r" (result));
    return result;
   #elif defined __has_builtin
    #if __has_builtin(__builtin_readcyclecounter)
     return __builtin_readcyclecounter();
    #else
     return __rdtsc();
    #endif
   #else
    return __rdtsc();
   #endif
}
 
inline void pause()
{
   #if defined (__arm__) || defined (__arm64__) || defined (__aarch64__)
    __asm__ __volatile__ ("yield");
   #elif __has_include(<emmintrin.h>)
    _mm_pause();
   #else
    static_assert (false, "Unknown platform");
   #endif
}
 
}} // namespace tracktion { inline namespace core