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ieeefp.h revision 1.5 
      1 /* $NetBSD: ieeefp.h,v 1.5 2003/01/17 22:11:16 thorpej 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 typedef int fp_except;
     12 
     13 #ifdef _KERNEL
     14 
     15 #include <sys/param.h>
     16 #include <sys/proc.h>
     17 #include <machine/fpu.h>
     18 #include <machine/alpha.h>
     19 
     20 /* FP_X_IOV is intentionally omitted from the architecture flags mask */
     21 
     22 #define	FP_AA_FLAGS (FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL | FP_X_IMP)
     23 
     24 #define float_raise(f)						\
     25 	do curlwp->l_md.md_flags |= NETBSD_FLAG_TO_FP_C(f);	\
     26 	while(0)
     27 
     28 #define float_set_inexact()	float_raise(FP_X_IMP)
     29 #define float_set_invalid()	float_raise(FP_X_INV)
     30 #define	fpgetround()		(alpha_read_fpcr() >> 58 & 3)
     31 
     32 #endif
     33 
     34 #define	FP_X_INV	0x01	/* invalid operation exception */
     35 #define	FP_X_DZ		0x02	/* divide-by-zero exception */
     36 #define	FP_X_OFL	0x04	/* overflow exception */
     37 #define	FP_X_UFL	0x08	/* underflow exception */
     38 #define	FP_X_IMP	0x10	/* imprecise (loss of precision; "inexact") */
     39 #define	FP_X_IOV	0x20    /* integer overflow */
     40 
     41 /*
     42  * fp_rnd bits match the fpcr, below, as well as bits 12:11
     43  * in fp operate instructions
     44  */
     45 typedef enum {
     46     FP_RZ = 0,			/* round to zero (truncate) */
     47     FP_RM = 1,			/* round toward negative infinity */
     48     FP_RN = 2,			/* round to nearest representable number */
     49     FP_RP = 3,			/* round toward positive infinity */
     50     _FP_DYNAMIC=FP_RP
     51 } fp_rnd;
     52 
     53 #endif /* _ALPHA_IEEEFP_H_ */
     54