ieeefp.h

来自「基于组件方式开发操作系统的OSKIT源代码」· C头文件 代码 · 共 41 行

/*	$NetBSD: ieeefp.h,v 1.3 1997/10/14 09:20:17 mark Exp $	*/

/* 
 * Based on ieeefp.h written by J.T. Conklin, Apr 28, 1995
 * Public domain.
 */

#ifndef _ARM32_IEEEFP_H_
#define _ARM32_IEEEFP_H_

/* FP exception codes */

#define FP_EXCEPT_INV	0
#define FP_EXCEPT_DZ	1
#define FP_EXCEPT_OFL	2
#define FP_EXCEPT_UFL	3
#define FP_EXCEPT_IMP	4

/* Exception type (used by fpsetmask() et al.) */

typedef int fp_except;

/* Bit defines for fp_except */

#define	FP_X_INV	(1 << FP_EXCEPT_INV)	/* invalid operation exception */
#define	FP_X_DZ		(1 << FP_EXCEPT_DZ)	/* divide-by-zero exception */
#define	FP_X_OFL	(1 << FP_EXCEPT_OFL)	/* overflow exception */
#define	FP_X_UFL	(1 << FP_EXCEPT_UFL)	/* underflow exception */
#define	FP_X_IMP	(1 << FP_EXCEPT_IMP)	/* imprecise (loss of precision; "inexact") */

/* Rounding modes */

typedef enum {
    FP_RN=0,			/* round to nearest representable number */
    FP_RP=1,			/* round toward positive infinity */
    FP_RM=2,			/* round toward negative infinity */
    FP_RZ=3			/* round to zero (truncate) */
} fp_rnd;

#endif /* _ARM32_IEEEFP_H_ */