Annotation of sys/arch/alpha/include/ieeefp.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ieeefp.h,v 1.4 2002/04/28 20:55:14 pvalchev Exp $ */
2: /* $NetBSD: ieeefp.h,v 1.1 1995/04/29 01:09:17 cgd Exp $ */
3:
4: /*
5: * Written by J.T. Conklin, Apr 28, 1995
6: * Public domain.
7: */
8:
9: #ifndef _ALPHA_IEEEFP_H_
10: #define _ALPHA_IEEEFP_H_
11:
12: typedef int fp_except;
13:
14: #ifdef _KERNEL
15:
16: #include <sys/param.h>
17: #include <sys/proc.h>
18: #include <machine/fpu.h>
19: #include <machine/cpu.h>
20:
21: /* FP_X_IOV is intentionally omitted from the architecture flags mask */
22:
23: #define FP_AA_FLAGS (FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL | FP_X_IMP)
24:
25: #define float_raise(f) \
26: do curproc->p_md.md_flags |= OPENBSD_FLAG_TO_FP_C(f); \
27: while(0)
28:
29: #define float_set_inexact() float_raise(FP_X_IMP)
30: #define float_set_invalid() float_raise(FP_X_INV)
31: #define fpgetround() (alpha_read_fpcr() >> 58 & 3)
32:
33: #endif
34:
35: #define FP_X_INV 0x01 /* invalid operation exception */
36: #define FP_X_DZ 0x02 /* divide-by-zero exception */
37: #define FP_X_OFL 0x04 /* overflow exception */
38: #define FP_X_UFL 0x08 /* underflow exception */
39: #define FP_X_IMP 0x10 /* imprecise (loss of precision; "inexact") */
40: #define FP_X_IOV 0x20 /* integer overflow */
41:
42: /*
43: * fp_rnd bits match the fpcr, below, as well as bits 12:11
44: * in fp operate instructions
45: */
46: typedef enum {
47: FP_RZ = 0, /* round to zero (truncate) */
48: FP_RM = 1, /* round toward negative infinity */
49: FP_RN = 2, /* round to nearest representable number */
50: FP_RP = 3, /* round toward positive infinity */
51: _FP_DYNAMIC=FP_RP
52: } fp_rnd;
53:
54: #endif /* _ALPHA_IEEEFP_H_ */
CVSweb