Home | History | Annotate | Line # | Download | only in include 
      1 /* $NetBSD: ieeefp.h,v 1.10 2016/08/25 07:39:55 christos Exp $ */
      2 
      3 /*
      4  * Written by J.T. Conklin, Apr 28, 1995
      5  * Public domain.
      6  */
      7 
      8 #ifndef _ALPHA_IEEEFP_H_
      9 #define _ALPHA_IEEEFP_H_
     10 
     11 #include <sys/featuretest.h>
     12 
     13 #if defined(_NETBSD_SOURCE) || defined(_ISOC99_SOURCE)
     14 
     15 #include <machine/fenv.h>
     16 
     17 #if !defined(_ISOC99_SOURCE)
     18 
     19 typedef int fp_except;
     20 
     21 #if defined(_KERNEL)
     22 
     23 #include <sys/param.h>
     24 #include <sys/proc.h>
     25 #include <machine/fpu.h>
     26 #include <machine/alpha.h>
     27 
     28 /* FP_X_IOV is intentionally omitted from the architecture flags mask */
     29 
     30 #define	FP_AA_FLAGS (FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL | FP_X_IMP)
     31 
     32 #define float_raise(f)						\
     33 	do curlwp->l_md.md_flags |= NETBSD_FLAG_TO_FP_C(f);	\
     34 	while(0)
     35 
     36 #define float_set_inexact()	float_raise(FP_X_IMP)
     37 #define float_set_invalid()	float_raise(FP_X_INV)
     38 #define	fpgetround()		(alpha_read_fpcr() >> 58 & 3)
     39 
     40 #endif /* _KERNEL */
     41 
     42 #define	FP_X_INV	FE_INVALID	/* invalid operation exception */
     43 #define	FP_X_DZ		FE_DIVBYZERO	/* divide-by-zero exception */
     44 #define	FP_X_OFL	FE_OVERFLOW	/* overflow exception */
     45 #define	FP_X_UFL	FE_UNDERFLOW	/* underflow exception */
     46 #define	FP_X_IMP	FE_INEXACT	/* imprecise (prec. loss; "inexact") */
     47 #define	FP_X_IOV	FE_INTOVF	/* integer overflow */
     48 
     49 /*
     50  * fp_rnd bits match the fpcr, below, as well as bits 12:11
     51  * in fp operate instructions
     52  */
     53 typedef enum {
     54     FP_RZ = FE_TOWARDZERO,	/* round to zero (truncate) */
     55     FP_RM = FE_DOWNWARD,	/* round toward negative infinity */
     56     FP_RN = FE_TONEAREST,	/* round to nearest representable number */
     57     FP_RP = FE_UPWARD,		/* round toward positive infinity */
     58     _FP_DYNAMIC=FP_RP
     59 } fp_rnd;
     60 
     61 #endif /* !_ISOC99_SOURCE */
     62 
     63 #endif	/* _NETBSD_SOURCE || _ISOC99_SOURCE */
     64 
     65 #endif /* _ALPHA_IEEEFP_H_ */
     66