1 /* $OpenBSD: ieeefp.h,v 1.6 2011/03/23 16:54:34 pirofti 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 _MACHINE_IEEEFP_H_ 10 #define _MACHINE_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_rnd; 52 53 #endif /* _MACHINE_IEEEFP_H_ */ 54