sysdeps/hppa/fpu/bits/fenv.h

   1 /* Copyright (C) 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by David Huggins-Daines <dhd@debian.org>
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _FENV_H
  21 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
  22 #endif
  23
  24 /* Define bits representing the exception.  We use the values of the
  25    appropriate enable bits in the FPU status word (which,
  26    coincidentally, are the same as the flag bits, but shifted right by
  27    27 bits).  */
  28 enum
  29 {
  30   FE_INVALID   = 1<<4, /* V */
  31 #define FE_INVALID      FE_INVALID
  32   FE_DIVBYZERO = 1<<3, /* Z */
  33 #define FE_DIVBYZERO    FE_DIVBYZERO
  34   FE_OVERFLOW  = 1<<2, /* O */
  35 #define FE_OVERFLOW     FE_OVERFLOW
  36   FE_UNDERFLOW = 1<<1, /* U */
  37 #define FE_UNDERFLOW    FE_UNDERFLOW
  38   FE_INEXACT   = 1<<0, /* I */
  39 #define FE_INEXACT      FE_INEXACT
  40 };
  41
  42 #define FE_ALL_EXCEPT \
  43         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  44
  45 /* The PA-RISC FPU supports all of the four defined rounding modes.
  46    We use the values of the RM field in the floating point status
  47    register for the appropriate macros.  */
  48 enum
  49   {
  50     FE_TONEAREST  = 0 << 9,
  51 #define FE_TONEAREST    FE_TONEAREST
  52     FE_TOWARDZERO = 1 << 9,
  53 #define FE_TOWARDZERO   FE_TOWARDZERO
  54     FE_UPWARD     = 2 << 9,
  55 #define FE_UPWARD       FE_UPWARD
  56     FE_DOWNWARD   = 3 << 9,
  57 #define FE_DOWNWARD     FE_DOWNWARD
  58   };
  59
  60 /* Type representing exception flags. */
  61 typedef unsigned int fexcept_t;
  62
  63 /* Type representing floating-point environment.  This structure
  64    corresponds to the layout of the status and exception words in the
  65    register file. */
  66 typedef struct
  67 {
  68   unsigned int __status_word;
  69   unsigned int __exception[7];
  70 } fenv_t;
  71
  72 /* If the default argument is used we use this value.  */
  73 #define FE_DFL_ENV ((fenv_t *) -1)
  74
  75 #ifdef __USE_GNU
  76 /* Floating-point environment where none of the exceptions are masked.  */
  77 # define FE_NOMASK_ENV  ((fenv_t *) -2)
  78 #endif