1/* $NetBSD: ieeefp.h,v 1.1 2001/01/10 19:02:06 bjh21 Exp $ */
2/*-
3 * Based on ieeefp.h written by J.T. Conklin, Apr 28, 1995
4 * Public domain.
5 */
6
7#ifndef _MACHINE_IEEEFP_H_
8#define _MACHINE_IEEEFP_H_
9
10/* Deprecated historical FPU control interface */
11
12/* FP exception codes */
13#define FP_EXCEPT_INV 0
14#define FP_EXCEPT_DZ 1
15#define FP_EXCEPT_OFL 2
16#define FP_EXCEPT_UFL 3
17#define FP_EXCEPT_IMP 4
18
19/* Exception type (used by fpsetmask() et al.) */
20
21typedef int fp_except;
22
23/* Bit defines for fp_except */
24
25#define FP_X_INV (1 << FP_EXCEPT_INV) /* invalid operation exception */
26#define FP_X_DZ (1 << FP_EXCEPT_DZ) /* divide-by-zero exception */
27#define FP_X_OFL (1 << FP_EXCEPT_OFL) /* overflow exception */
28#define FP_X_UFL (1 << FP_EXCEPT_UFL) /* underflow exception */
29#define FP_X_IMP (1 << FP_EXCEPT_IMP) /* imprecise (loss of precision; "inexact") */
30
31/* Rounding modes */
32
33typedef enum {
34 FP_RN=0, /* round to nearest representable number */
35 FP_RP=1, /* round toward positive infinity */
36 FP_RM=2, /* round toward negative infinity */
37 FP_RZ=3 /* round to zero (truncate) */
38} fp_rnd_t;
39
40/*
41 * FP precision modes
42 */
43typedef enum {
44 FP_PS=0, /* 24 bit (single-precision) */
45 FP_PRS, /* reserved */
46 FP_PD, /* 53 bit (double-precision) */
47 FP_PE /* 64 bit (extended-precision) */
48} fp_prec_t;
49
50#define fp_except_t int
51
52/* Augment the userland declarations. */
53__BEGIN_DECLS
54extern fp_rnd_t fpgetround(void);
55extern fp_rnd_t fpsetround(fp_rnd_t);
56extern fp_except_t fpgetmask(void);
57extern fp_except_t fpsetmask(fp_except_t);
58extern fp_except_t fpgetsticky(void);
59extern fp_except_t fpsetsticky(fp_except_t);
60__END_DECLS
61
62#endif /* _MACHINE_IEEEFP_H_ */