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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// Copyright (C) 2003 Fast Search & Transfer ASA
// Copyright (C) 2003 Overture Services Norway AS
#pragma once
#include <vespa/fastos/fastos.h>
namespace vespalib {
#if defined(__i386__) || defined(__x86_64__)
class X86CpuInfo
{
public:
bool hasMMX() const { return hasFeature(23); }
bool hasSSE() const { return hasFeature(25); }
bool hasSSE2() const { return hasFeature(26); }
bool hasSSE3() const { return hasFeature(32); }
bool hasCX16() const { return hasFeature(45); }
bool hasFeature(size_t i) const { return (_cpuFeatures >> i) & 1; }
bool hasFeature(const char *name) const;
static void print(FILE * fp);
/**
* Use this accessor to get information about the CPU.
* Only the first access will actually extract data, all
* subsequent uses are very cheap.
**/
static const X86CpuInfo& cpuInfo() {
if (_CpuInfoSingletonPtr == 0) {
fillSingleton();
_CpuInfoSingletonPtr = &_CpuInfoSingleton;
}
return *_CpuInfoSingletonPtr;
}
private:
struct CpuFeature
{
size_t BitNo;
const char *Name;
const char *Description;
const char *Comment;
};
static CpuFeature _CpuFeatureList[];
static X86CpuInfo _CpuInfoSingleton;
static X86CpuInfo *_CpuInfoSingletonPtr;
static void fillSingleton();
// no outside construction allowed:
X86CpuInfo();
uint64_t _cpuFeatures;
public:
// public data extracted from CPU
uint32_t mainFeatures;
uint32_t extendedFeatures;
uint32_t apicInfo; // brand, CLFLUSH line size, logical / physical, local apic ID
uint32_t versionInfo; // family, model, stepping
// add more info later:
// uint32_t numCpuInfo;
char cpuName[13];
uint32_t largestStandardFunction;
};
#endif
/**
* @brief Atomic instructions class
*
* Here are fast handcoded assembly functions for doing some special
* low level functions that can be carried out very fast by special instructions.
* Currently only implemented for GCC on i386 and x86_64 platforms.
**/
class Cpu
{
public:
#if defined(__x86_64__)
static void cpuid(int op, uint32_t & eax, uint32_t & ebx, uint32_t & ecx, uint32_t & edx) {
__asm__("cpuid"
: "=a" (eax),
"=b" (ebx),
"=c" (ecx),
"=d" (edx)
: "0" (op));
}
#endif
};
}
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