1 /* Copyright (C) 2000, 2012 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Denis Joseph Barrow <djbarrow@de.ibm.com>.
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.
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.
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
21 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
24 /* Define bits representing the exception. We use the bit positions
25 of the appropriate bits in the FPU control word. */
29 #define FE_INVALID FE_INVALID
31 #define FE_DIVBYZERO FE_DIVBYZERO
33 #define FE_OVERFLOW FE_OVERFLOW
35 #define FE_UNDERFLOW FE_UNDERFLOW
37 #define FE_INEXACT FE_INEXACT
39 /* We dont use the y bit of the DXC in the floating point control register
40 as glibc has no FE encoding for fe inexact incremented
41 or fe inexact truncated.
42 We currently use the flag bits in the fpc
43 as these are sticky for feholdenv & feupdatenv as it is defined
44 in the HP Manpages. */
47 #define FE_ALL_EXCEPT \
48 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
53 #define FE_TONEAREST FE_TONEAREST
55 #define FE_DOWNWARD FE_DOWNWARD
57 #define FE_UPWARD FE_UPWARD
59 #define FE_TOWARDZERO FE_TOWARDZERO
63 /* Type representing exception flags. */
64 typedef unsigned int fexcept_t; /* size of fpc */
67 /* Type representing floating-point environment. This function corresponds
68 to the layout of the block written by the `fstenv'. */
72 void *ieee_instruction_pointer;
73 /* failing instruction for ieee exceptions */
76 /* If the default argument is used we use this value. */
77 #define FE_DFL_ENV ((const fenv_t *) -1)
80 /* Floating-point environment where none of the exceptions are masked. */
81 # define FE_NOMASK_ENV ((const fenv_t *) -2)