OpenTTD Source  20241121-master-g67a0fccfad
cpu.h File Reference

Functions related to CPU specific instructions. More...

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Functions

void ottd_cpuid (int info[4], int type)
 Get the CPUID information from the CPU. More...
 
bool HasCPUIDFlag (uint type, uint index, uint bit)
 Check whether the current CPU has the given flag. More...
 

Detailed Description

Functions related to CPU specific instructions.

Definition in file cpu.h.

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 84 of file cpu.cpp.

References HasBit(), and ottd_cpuid().

◆ ottd_cpuid()

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

Get the CPUID information from the CPU.

Parameters
infoThe retrieved info. All zeros on architectures without CPUID.
typeThe information this instruction should retrieve.

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 78 of file cpu.cpp.

Referenced by HasCPUIDFlag().