cpu.h

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/* Copyright (C) 2022 Wildfire Games.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
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 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
/*
 * CPU and memory detection.
 */
 
#ifndef INCLUDED_CPU
#define INCLUDED_CPU
 
#include "lib/sysdep/compiler.h"
 
 
namespace ERR
{
    const Status CPU_FEATURE_MISSING     = -130000;
    const Status CPU_UNKNOWN_OPCODE      = -130001;
    const Status CPU_UNKNOWN_VENDOR      = -130002;
 
}
 
 
//-----------------------------------------------------------------------------
// CPU detection
 
/**
 * @return string identifying the CPU (usually a cleaned-up version of the
 * brand string)
 **/
const char* cpu_IdentifierString();
 
 
/**
 * pause in spin-wait loops, as a performance optimisation.
 **/
inline void cpu_Pause()
{
#if MSC_VERSION && ARCH_X86_X64
    _mm_pause();
#elif GCC_VERSION && ARCH_X86_X64
    __asm__ __volatile__( "rep; nop" : : : "memory" );
#endif
}
 
#endif  // #ifndef INCLUDED_CPU