FastInt.h File Reference

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Functions
int32	int32abs (const int32 value)
uint32	int32abs2uint32 (const int32 value)
int32	float2int32 (const float value)
	Fastest Method of float2int32. More...
int32	double2int32 (const double value)
	Fastest Method of double2int32. More...

Function Documentation

int32 double2int32 ( const double  value )

inline

Fastest Method of double2int32.

Definition at line 61 of file FastInt.h.

{
#ifdef HAVE___ASM
    int32 i;
    __asm {
        fld value
        frndint
        fistp i
    }
    return i;
#else /* !HAVE___ASM */
  union { int32 asInt[2]; double asDouble; } n;
  n.asDouble = value + 6755399441055744.0;

  return n.asInt[0];
#endif /* !HAVE___ASM */
}

int32 float2int32 ( const float  value )

inline

Fastest Method of float2int32.

Definition at line 42 of file FastInt.h.

Referenced by ascent_roundf().

{
#ifdef HAVE___ASM
    int32 i;
    __asm {
        fld value
        frndint
        fistp i
    }
    return i;
#else /* !HAVE___ASM */
    union { int32 asInt[2]; double asDouble; } n;
    n.asDouble = value + 6755399441055744.0;

    return n.asInt[0];
#endif /* !HAVE___ASM */
}

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int32 int32abs ( const int32  value )

inline

Definition at line 30 of file FastInt.h.

{
    return (value ^ (value >> 31)) - (value >> 31);
}

uint32 int32abs2uint32 ( const int32  value )

inline

Definition at line 36 of file FastInt.h.

{
    return (uint32)(value ^ (value >> 31)) - (value >> 31);
}