sysdeps/s390/fpu/bits/fenv.h

   1 /* Copyright (C) 2000-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _FENV_H
  19 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
  20 #endif
  21
  22 /* Define bits representing the exception.  We use the bit positions
  23    of the appropriate bits in the FPU control word.  */
  24 enum
  25   {
  26     FE_INVALID =
  27 #define FE_INVALID      0x80
  28       FE_INVALID,
  29     FE_DIVBYZERO =
  30 #define FE_DIVBYZERO    0x40
  31       FE_DIVBYZERO,
  32     FE_OVERFLOW =
  33 #define FE_OVERFLOW     0x20
  34       FE_OVERFLOW,
  35     FE_UNDERFLOW =
  36 #define FE_UNDERFLOW    0x10
  37       FE_UNDERFLOW,
  38     FE_INEXACT =
  39 #define FE_INEXACT      0x08
  40       FE_INEXACT
  41   };
  42 /* We dont use the y bit of the DXC in the floating point control register
  43    as glibc has no FE encoding for fe inexact incremented
  44    or fe inexact truncated.
  45    We currently  use the flag bits in the fpc
  46    as these are sticky for feholdenv & feupdatenv as it is defined
  47    in the HP Manpages.  */
  48
  49
  50 #define FE_ALL_EXCEPT \
  51         (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  52
  53 enum
  54   {
  55     FE_TONEAREST =
  56 #define FE_TONEAREST    0
  57       FE_TONEAREST,
  58     FE_DOWNWARD =
  59 #define FE_DOWNWARD     0x3
  60       FE_DOWNWARD,
  61     FE_UPWARD =
  62 #define FE_UPWARD       0x2
  63       FE_UPWARD,
  64     FE_TOWARDZERO =
  65 #define FE_TOWARDZERO   0x1
  66       FE_TOWARDZERO
  67   };
  68
  69
  70 /* Type representing exception flags.  */
  71 typedef unsigned int fexcept_t; /* size of fpc */
  72
  73
  74 /* Type representing floating-point environment.  This function corresponds
  75    to the layout of the block used by fegetenv and fesetenv.  */
  76 typedef struct
  77 {
  78   fexcept_t __fpc;
  79   void *__unused;
  80   /* The field __unused (formerly __ieee_instruction_pointer) is a relict from
  81      commit "Remove PTRACE_PEEKUSER" (87b9b50f0d4b92248905e95a06a13c513dc45e59)
  82      and isn't used anymore.  */
  83 } fenv_t;
  84
  85 /* If the default argument is used we use this value.  */
  86 #define FE_DFL_ENV      ((const fenv_t *) -1)
  87
  88 #ifdef __USE_GNU
  89 /* Floating-point environment where none of the exceptions are masked.  */
  90 # define FE_NOMASK_ENV  ((const fenv_t *) -2)
  91 #endif
  92
  93 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
  94 /* Type representing floating-point control modes.  */
  95 typedef unsigned int femode_t;
  96
  97 /* Default floating-point control modes.  */
  98 # define FE_DFL_MODE    ((const femode_t *) -1L)
  99 #endif