sys/arch/alpha/include/ieeefp.h

   1 /* $NetBSD: ieeefp.h,v 1.6 2008/08/05 16:47:41 matt 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 typedef int fenv_t;
  16 typedef int fexcept_t;
  17
  18 #define FE_INVALID      0x01    /* invalid operation exception */
  19 #define FE_DIVBYZERO    0x02    /* divide-by-zero exception */
  20 #define FE_OVERFLOW     0x04    /* overflow exception */
  21 #define FE_UNDERFLOW    0x08    /* underflow exception */
  22 #define FE_INEXACT      0x10    /* imprecise (loss of precision; "inexact") */
  23 #define FE_IOVERFLOW    0x20    /* integer overflow */
  24
  25 #define FE_ALL_EXCEPT   0x3f
  26
  27 /*
  28  * These bits match the fpcr as well as bits 12:11
  29  * in fp operate instructions
  30  */
  31 #define FE_TOWARDZERO   0       /* round to zero (truncate) */
  32 #define FE_DOWNWARD     1       /* round toward negative infinity */
  33 #define FE_TONEAREST    2       /* round to nearest representable number */
  34 #define FE_UPWARD       3       /* round toward positive infinity */
  35
  36 #if !defined(_ISOC99_SOURCE)
  37
  38 typedef int fp_except;
  39
  40 #if defined(_KERNEL)
  41
  42 #include <sys/param.h>
  43 #include <sys/proc.h>
  44 #include <machine/fpu.h>
  45 #include <machine/alpha.h>
  46
  47 /* FP_X_IOV is intentionally omitted from the architecture flags mask */
  48
  49 #define FP_AA_FLAGS (FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL | FP_X_IMP)
  50
  51 #define float_raise(f)                                          \
  52         do curlwp->l_md.md_flags |= NETBSD_FLAG_TO_FP_C(f);     \
  53         while(0)
  54
  55 #define float_set_inexact()     float_raise(FP_X_IMP)
  56 #define float_set_invalid()     float_raise(FP_X_INV)
  57 #define fpgetround()            (alpha_read_fpcr() >> 58 & 3)
  58
  59 #endif /* _KERNEL */
  60
  61 #define FP_X_INV        FE_INVALID      /* invalid operation exception */
  62 #define FP_X_DZ         FE_DIVBYZERO    /* divide-by-zero exception */
  63 #define FP_X_OFL        FE_OVERFLOW     /* overflow exception */
  64 #define FP_X_UFL        FE_UNDERFLOW    /* underflow exception */
  65 #define FP_X_IMP        FE_INEXACT      /* imprecise (prec. loss; "inexact") */
  66 #define FP_X_IOV        FE_IOVERFLOW    /* integer overflow */
  67
  68 /*
  69  * fp_rnd bits match the fpcr, below, as well as bits 12:11
  70  * in fp operate instructions
  71  */
  72 typedef enum {
  73     FP_RZ = FE_TOWARDZERO,      /* round to zero (truncate) */
  74     FP_RM = FE_DOWNWARD,        /* round toward negative infinity */
  75     FP_RN = FE_TONEAREST,       /* round to nearest representable number */
  76     FP_RP = FE_UPWARD,          /* round toward positive infinity */
  77     _FP_DYNAMIC=FP_RP
  78 } fp_rnd;
  79
  80 #endif /* !_ISOC99_SOURCE */
  81
  82 #endif  /* _NETBSD_SOURCE || _ISOC99_SOURCE */
  83
  84 #endif /* _ALPHA_IEEEFP_H_ */