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tasks/libposix/include/posix/bits/fenv.h

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+/* Copyright (C) 1997, 1998, 1999 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; 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
+
+#ifdef __MAVERICK__
+
+/* Define bits representing exceptions in the FPU status word.  */
+enum
+  {
+    FE_INVALID = 1,
+#define FE_INVALID FE_INVALID
+    FE_OVERFLOW = 4,
+#define FE_OVERFLOW FE_OVERFLOW
+    FE_UNDERFLOW = 8,
+#define FE_UNDERFLOW FE_UNDERFLOW
+    FE_INEXACT = 16,
+#define FE_INEXACT FE_INEXACT
+  };
+
+/* Amount to shift by to convert an exception to a mask bit.  */
+#define FE_EXCEPT_SHIFT    5
+
+/* All supported exceptions.  */
+#define FE_ALL_EXCEPT  \
+	(FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
+
+/* IEEE rounding modes.  */
+enum
+  {
+    FE_TONEAREST = 0,
+#define FE_TONEAREST    FE_TONEAREST
+    FE_TOWARDZERO = 0x400,
+#define FE_TOWARDZERO   FE_TOWARDZERO
+    FE_DOWNWARD = 0x800,
+#define FE_DOWNWARD     FE_DOWNWARD
+    FE_UPWARD = 0xc00,
+#define FE_UPWARD       FE_UPWARD
+  };
+
+#define FE_ROUND_MASK (FE_UPWARD)
+
+#else /* !__MAVERICK__ */
+
+/* Define bits representing exceptions in the FPU status word.  */
+enum
+  {
+    FE_INVALID = 1,
+#define FE_INVALID FE_INVALID
+    FE_DIVBYZERO = 2,
+#define FE_DIVBYZERO FE_DIVBYZERO
+    FE_OVERFLOW = 4,
+#define FE_OVERFLOW FE_OVERFLOW
+    FE_UNDERFLOW = 8,
+#define FE_UNDERFLOW FE_UNDERFLOW
+  };
+
+/* Amount to shift by to convert an exception to a mask bit.  */
+#define FE_EXCEPT_SHIFT	16
+
+/* All supported exceptions.  */
+#define FE_ALL_EXCEPT	\
+	(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW)
+
+/* The ARM FPU basically only supports round-to-nearest.  Other rounding
+   modes exist, but you have to encode them in the actual instruction.  */
+#define FE_TONEAREST	0
+
+#endif /* __MAVERICK__ */
+
+/* Type representing exception flags. */
+typedef unsigned long int fexcept_t;
+
+/* Type representing floating-point environment.  */
+typedef struct
+  {
+    unsigned long int __cw;
+  }
+fenv_t;
+
+/* If the default argument is used we use this value.  */
+#define FE_DFL_ENV	((fenv_t *) -1l)