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+/* Copyright (C) 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _FENV_H
+#error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
+#endif
+
+
+/* Define bits representing the exception. We use the bit positions
+ of the appropriate bits in the FPU control word. */
+enum
+ {
+ FE_INVALID = 0x01,
+#define FE_INVALID FE_INVALID
+ __FE_DENORM = 0x02,
+ FE_DIVBYZERO = 0x04,
+#define FE_DIVBYZERO FE_DIVBYZERO
+ FE_OVERFLOW = 0x08,
+#define FE_OVERFLOW FE_OVERFLOW
+ FE_UNDERFLOW = 0x10,
+#define FE_UNDERFLOW FE_UNDERFLOW
+ FE_INEXACT = 0x20
+#define FE_INEXACT FE_INEXACT
+ };
+
+#define FE_ALL_EXCEPT \
+ (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+
+/* The ix87 FPU supports all of the four defined rounding modes. We
+ use again the bit positions in the FPU control word as the values
+ for the appropriate macros. */
+enum
+ {
+ FE_TONEAREST = 0,
+#define FE_TONEAREST FE_TONEAREST
+ FE_DOWNWARD = 0x400,
+#define FE_DOWNWARD FE_DOWNWARD
+ FE_UPWARD = 0x800,
+#define FE_UPWARD FE_UPWARD
+ FE_TOWARDSZERO = 0xc00
+#define FE_TOWARDSZERO FE_TOWARDSZERO
+ };
+
+
+/* Type representing exception flags. */
+typedef unsigned short int fexcept_t;
+
+
+/* Type representing floating-point environment. This function corresponds to the layout of the block written by the `fstenv'. */
+typedef struct
+ {
+ unsigned short int control_word;
+ unsigned short int __unused1;
+ unsigned short int status_word;
+ unsigned short int __unused2;
+ unsigned short int tags;
+ unsigned short int __unused3;
+ unsigned int eip;
+ unsigned short int cs_selector;
+ unsigned int opcode:11;
+ unsigned int __unused4:5;
+ unsigned int data_offset;
+ unsigned short int data_selector;
+ unsigned short int __unused5;
+ }
+fenv_t;
+
+/* If the default argument is used we use this value. */
+#define FE_DFL_ENV ((fenv_t *) -1)
+
+#ifdef __USE_GNU
+/* Floating-point environment where none of the exception is masked. */
+# define FE_NOMASK_ENV ((fenv_t *) -2)
+#endif