54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/* $NetBSD: ieeefp.h,v 1.4 2001/04/26 03:10:46 ross Exp $ */
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/*
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* Written by J.T. Conklin, Apr 28, 1995
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* Public domain.
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*/
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#ifndef _ALPHA_IEEEFP_H_
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#define _ALPHA_IEEEFP_H_
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typedef int fp_except;
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#ifdef _KERNEL
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <machine/fpu.h>
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#include <machine/alpha.h>
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/* FP_X_IOV is intentionally omitted from the architecture flags mask */
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#define FP_AA_FLAGS (FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL | FP_X_IMP)
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#define float_raise(f) \
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do curproc->p_md.md_flags |= NETBSD_FLAG_TO_FP_C(f); \
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while(0)
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#define float_set_inexact() float_raise(FP_X_IMP)
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#define float_set_invalid() float_raise(FP_X_INV)
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#define fpgetround() (alpha_read_fpcr() >> 58 & 3)
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#endif
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#define FP_X_INV 0x01 /* invalid operation exception */
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#define FP_X_DZ 0x02 /* divide-by-zero exception */
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#define FP_X_OFL 0x04 /* overflow exception */
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#define FP_X_UFL 0x08 /* underflow exception */
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#define FP_X_IMP 0x10 /* imprecise (loss of precision; "inexact") */
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#define FP_X_IOV 0x20 /* integer overflow */
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/*
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* fp_rnd bits match the fpcr, below, as well as bits 12:11
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* in fp operate instructions
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*/
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typedef enum {
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FP_RZ = 0, /* round to zero (truncate) */
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FP_RM = 1, /* round toward negative infinity */
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FP_RN = 2, /* round to nearest representable number */
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FP_RP = 3, /* round toward positive infinity */
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_FP_DYNAMIC=FP_RP
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} fp_rnd;
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#endif /* _ALPHA_IEEEFP_H_ */
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