efloat.c File Reference

#include <precomp.h>

Include dependency graph for efloat.c:

Go to the source code of this file.

Macros
#define	EXCESS   126L
#define	SIGNBIT   0x80000000L
#define	SIGN(fp)   ((fp) & SIGNBIT)
#define	EXP(fp)   (((fp) >> 23L) & 0xFF)
#define	MANT(fp)   ((fp) & 0x7FFFFFL)
#define	PACK(s, e, m)   ((s) | ((e) << 23L) | (m))

Functions
FLOATL FASTCALL	EFtoF (EFLOAT_S *efp)
VOID FASTCALL	FtoEF (EFLOAT_S *efp, FLOATL f)

Macro Definition Documentation

EXCESS

#define EXCESS   126L

Definition at line 11 of file efloat.c.

EXP

#define EXP

(

fp

)

(((fp) >> 23L) & 0xFF)

Definition at line 14 of file efloat.c.

MANT

#define MANT

(

fp

)

((fp) & 0x7FFFFFL)

Definition at line 15 of file efloat.c.

PACK

#define PACK	(		s,
			e,
			m
	)		((s) | ((e) << 23L) | (m))

Definition at line 16 of file efloat.c.

SIGN

#define SIGN

(

fp

)

((fp) & SIGNBIT)

Definition at line 13 of file efloat.c.

SIGNBIT

#define SIGNBIT   0x80000000L

Definition at line 12 of file efloat.c.

Function Documentation

EFtoF()

FLOATL FASTCALL EFtoF

(

EFLOAT_S *

efp

)

Definition at line 20 of file efloat.c.

{
    ULONG Mant, Exp, Sign;
 
    if (!efp->lMant) return 0;
 
    Mant = efp->lMant;
    Exp = efp->lExp;
    Sign = SIGN(Mant);
 
    if (Sign) Mant = -(LONG)Mant;
    Mant >>= 7;
    Exp += (EXCESS-1);
 
    Mant = MANT(Mant);
    return PACK(Sign, Exp, Mant);
}

FtoEF()

VOID FASTCALL FtoEF	(	EFLOAT_S *	efp,
		FLOATL	f
	)

Definition at line 40 of file efloat.c.

{
    ULONG Mant, Exp, Sign = 0;
    gxf_long worker;
 
#ifdef _X86_
    worker.l = f; // It's a float stored in a long.
#else
    worker.f = f;
#endif
 
    Exp = EXP(worker.l);
    Mant = MANT(worker.l);
    if (SIGN(worker.l)) Sign = -1;
 
    Mant = ((Mant << 7) | 0x40000000);
    Mant ^= Sign;
    Mant -= Sign;
    Exp -= (EXCESS-1);
 
    efp->lMant = Mant;
    efp->lExp = Exp;
}