OpenTTD
Functions
cpu.cpp File Reference

OS/CPU/compiler dependent CPU specific calls. More...

#include "stdafx.h"
#include "core/bitmath_func.hpp"
#include "safeguards.h"

Go to the source code of this file.

Functions

uint64 ottd_rdtsc ()
 Get the tick counter from the CPU (high precision timing). More...
 
void ottd_cpuid (int info[4], int type)
 Definitions for CPU detection: More...
 
bool HasCPUIDFlag (uint type, uint index, uint bit)
 Check whether the current CPU has the given flag. More...
 

Detailed Description

OS/CPU/compiler dependent CPU specific calls.

Definition in file cpu.cpp.

Function Documentation

◆ HasCPUIDFlag()

bool HasCPUIDFlag ( uint  type,
uint  index,
uint  bit 
)

Check whether the current CPU has the given flag.

Parameters
typeThe type to be passing to cpuid (usually 1).
indexThe index in the returned info array.
bitThe bit index that needs to be set.
Returns
The value of the bit, or false when there is no CPUID or the type is not available.

Definition at line 133 of file cpu.cpp.

References HasBit(), and ottd_cpuid().

◆ ottd_cpuid()

void ottd_cpuid ( int  info[4],
int  type 
)

Definitions for CPU detection:

Get the CPUID information from the CPU.

MSVC offers cpu information while gcc only implements in gcc 4.8 __builtin_cpu_supports and friends http://msdn.microsoft.com/library/vstudio/hskdteyh%28v=vs.100%29.aspx http://gcc.gnu.org/onlinedocs/gcc/X86-Built-in-Functions.html

Other platforms/architectures don't have CPUID, so zero the info and then most (if not all) of the features are set as if they do not exist.

Definition at line 127 of file cpu.cpp.

Referenced by HasCPUIDFlag(), and ottd_rdtsc().

◆ ottd_rdtsc()

uint64 ottd_rdtsc ( )

Get the tick counter from the CPU (high precision timing).

Returns
The count.

Definition at line 78 of file cpu.cpp.

References ottd_cpuid().