sysdeps/loongarch/bits/fenv.h

   1 /* Floating point environment.
   2    Copyright (C) 2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _FENV_H
  20 #error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
  21 #endif
  22
  23 /* Define bits representing the exception.  We use the bit positions
  24    of the appropriate bits in the FPU control word.  */
  25 enum
  26 {
  27   FE_INEXACT =
  28 #define FE_INEXACT 0x010000
  29     FE_INEXACT,
  30   FE_UNDERFLOW =
  31 #define FE_UNDERFLOW 0x020000
  32     FE_UNDERFLOW,
  33   FE_OVERFLOW =
  34 #define FE_OVERFLOW 0x040000
  35     FE_OVERFLOW,
  36   FE_DIVBYZERO =
  37 #define FE_DIVBYZERO 0x080000
  38     FE_DIVBYZERO,
  39   FE_INVALID =
  40 #define FE_INVALID 0x100000
  41     FE_INVALID,
  42 };
  43
  44 #define FE_ALL_EXCEPT \
  45   (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
  46
  47 /* The LoongArch FPU supports all of the four defined rounding modes.  We
  48    use again the bit positions in the FPU control word as the values
  49    for the appropriate macros.  */
  50 enum
  51 {
  52   FE_TONEAREST =
  53 #define FE_TONEAREST 0x000
  54     FE_TONEAREST,
  55   FE_TOWARDZERO =
  56 #define FE_TOWARDZERO 0x100
  57     FE_TOWARDZERO,
  58   FE_UPWARD =
  59 #define FE_UPWARD 0x200
  60     FE_UPWARD,
  61   FE_DOWNWARD =
  62 #define FE_DOWNWARD 0x300
  63     FE_DOWNWARD
  64 };
  65
  66 /* Type representing exception flags.  */
  67 typedef unsigned int fexcept_t;
  68
  69 /* Type representing floating-point environment.  This function corresponds
  70    to the layout of the block written by the `fstenv'.  */
  71 typedef struct
  72 {
  73   unsigned int __fp_control_register;
  74 } fenv_t;
  75
  76 /* If the default argument is used we use this value.  */
  77 #define FE_DFL_ENV ((const fenv_t *) -1)
  78
  79 #ifdef __USE_GNU
  80 /* Floating-point environment where none of the exception is masked.  */
  81 #define FE_NOMASK_ENV ((const fenv_t *) -257)
  82 #endif
  83
  84 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
  85 /* Type representing floating-point control modes.  */
  86 typedef unsigned int femode_t;
  87
  88 /* Default floating-point control modes.  */
  89 #define FE_DFL_MODE ((const femode_t *) -1L)
  90 #endif