fma3_available.c File Reference

#include <intrin.h>
#include <sect_attribs.h>

Include dependency graph for fma3_available.c:

Go to the source code of this file.

Macros
#define	_CRTALLOC(x)

Typedefs
typedef int(__cdecl *	_PIFV) (void)

Functions
int __cdecl	_set_FMA3_enable (int flag)
int	__fma3_lib_init (void)
	_CRTALLOC (".CRT$XIC")

Variables
int	__fma3_is_available = 0
int	__use_fma3_lib = 0

Macro Definition Documentation

_CRTALLOC

#define _CRTALLOC

(

x

)

Definition at line 37 of file fma3_available.c.

Typedef Documentation

_PIFV

typedef int(__cdecl * _PIFV) (void)

Definition at line 40 of file fma3_available.c.

Function Documentation

__fma3_lib_init()

int __fma3_lib_init

(

void

)

_CRTALLOC()

_CRTALLOC

(

".CRT$XIC"

)

Definition at line 54 of file fma3_available.c.

{
    int CPUID[4]; // CPUID[2] is ECX;
 
    __fma3_is_available = 0;
    __cpuid(CPUID, 1);
    if (CPUID[2] & (1 << 12)) {
        __fma3_is_available = 1;
    }
 
    __use_fma3_lib = __fma3_is_available;
    return 0;
}

_set_FMA3_enable()

int __cdecl _set_FMA3_enable

(

int

flag

)

Definition at line 46 of file fma3_available.c.

{
    if (__fma3_is_available) __use_fma3_lib = flag;
    return __use_fma3_lib;
}

Variable Documentation

__fma3_is_available

int __fma3_is_available = 0

Definition at line 42 of file fma3_available.c.

Referenced by _CRTALLOC(), and _set_FMA3_enable().

__use_fma3_lib

int __use_fma3_lib = 0

Definition at line 43 of file fma3_available.c.

Referenced by _CRTALLOC(), and _set_FMA3_enable().