1 /* $NetBSD: ieeefp.h,v 1.4 2001/04/26 03:10:46 ross 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 curproc->p_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