fp_bias.h

minux的源代码,一个非常小的操作系统

/*
  (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
  See the copyright notice in the ACK home directory, in the file "Copyright".
*/

/* $Header: FP_bias.h,v 1.4 89/07/25 14:16:55 ceriel Exp $ */

/*
	include file for floating point package
*/

		/*	FLOAT FORMAT EXPONENT BIAS	*/

#define	SGL_BIAS	 127	/* excess  128 notation used	*/
#define	DBL_BIAS	1023	/* excess 1024 notation used	*/
#define	EXT_BIAS	   0	/* 2s-complement notation used	*/
				/* this is possible because the	*/
				/* sign is in a seperate word	*/
		
		/*	VARIOUS MAX AND MIN VALUES	*/
		/*	1) FOR THE DIFFERENT FORMATS	*/

#define	SGL_MAX		   254	/*	standard definition	*/
#define	SGL_MIN		     1	/*	standard definition	*/
#define	DBL_MAX		  2046	/*	standard definition	*/
#define	DBL_MIN		     1	/*	standard definition	*/
#define EXT_MAX		 16383	/*	standard minimum	*/
#define EXT_MIN		-16382	/*	standard minimum	*/