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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
+
+
+/* Define bits representing the exception. We use the bit positions of
+ the appropriate bits in the FPSCR... */
+enum
+ {
+ FE_INEXACT = 1 << (31 - 6),
+#define FE_INEXACT FE_INEXACT
+ FE_DIVBYZERO = 1 << (31 - 5),
+#define FE_DIVBYZERO FE_DIVBYZERO
+ FE_UNDERFLOW = 1 << (31 - 4),
+#define FE_UNDERFLOW FE_UNDERFLOW
+ FE_OVERFLOW = 1 << (31 - 3),
+#define FE_OVERFLOW FE_OVERFLOW
+
+ /* ... except for FE_INVALID, for which we use bit 31. FE_INVALID
+ actually corresponds to bits 7 through 12 and 21 through 23
+ in the FPSCR, but we can't use that because the current draft
+ says that it must be a power of 2. Instead we use bit 2 which
+ is the summary bit for all the FE_INVALID exceptions, which
+ kind of makes sense. */
+ FE_INVALID = 1 << (31 - 2),
+#define FE_INVALID FE_INVALID
+
+#ifdef __USE_GNU
+ /* Breakdown of the FE_INVALID bits. Setting FE_INVALID on an
+ input to a routine is equivalent to setting all of these bits;
+ FE_INVALID will be set on output from a routine iff one of
+ these bits is set. Note, though, that you can't disable or
+ enable these exceptions individually. */
+
+ /* Operation with SNaN. */
+ FE_INVALID_SNAN = 1 << (31 - 7),
+# define FE_INVALID_SNAN FE_INVALID_SNAN
+
+ /* Inf - Inf */
+ FE_INVALID_ISI = 1 << (31 - 8),
+# define FE_INVALID_ISI FE_INVALID_ISI
+
+ /* Inf / Inf */
+ FE_INVALID_IDI = 1 << (31 - 9),
+# define FE_INVALID_IDI FE_INVALID_IDI
+
+ /* 0 / 0 */
+ FE_INVALID_ZDZ = 1 << (31 - 10),
+# define FE_INVALID_ZDZ FE_INVALID_ZDZ
+
+ /* Inf * 0 */
+ FE_INVALID_IMZ = 1 << (31 - 11),
+# define FE_INVALID_IMZ FE_INVALID_IMZ
+
+ /* Comparison with NaN or SNaN. */
+ FE_INVALID_COMPARE = 1 << (31 - 12),
+# define FE_INVALID_COMPARE FE_INVALID_COMPARE
+
+ /* Invalid operation flag for software (not set by hardware). */
+ /* Note that some chips don't have this implemented, presumably
+ because no-one expected anyone to write software for them %-). */
+ FE_INVALID_SOFTWARE = 1 << (31 - 21),
+# define FE_INVALID_SOFTWARE FE_INVALID_SOFTWARE
+
+ /* Square root of negative number (including -Inf). */
+ /* Note that some chips don't have this implemented. */
+ FE_INVALID_SQRT = 1 << (31 - 22),
+# define FE_INVALID_SQRT FE_INVALID_SQRT
+
+ /* Conversion-to-integer of a NaN or a number too large or too small. */
+ FE_INVALID_INTEGER_CONVERSION = 1 << (31 - 23)
+# define FE_INVALID_INTEGER_CONVERSION FE_INVALID_INTEGER_CONVERSION
+
+# define FE_ALL_INVALID \
+ (FE_INVALID_SNAN | FE_INVALID_ISI | FE_INVALID_IDI | FE_INVALID_ZDZ \
+ | FE_INVALID_IMZ | FE_INVALID_COMPARE | FE_INVALID_SOFTWARE \
+ | FE_INVALID_SQRT | FE_INVALID_INTEGER_CONVERSION)
+#endif
+ };
+
+#define FE_ALL_EXCEPT \
+ (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
+
+/* PowerPC chips support all of the four defined rounding modes. We
+ use the bit pattern in the FPSCR as the values for the
+ appropriate macros. */
+enum
+ {
+ FE_TONEAREST = 0,
+#define FE_TONEAREST FE_TONEAREST
+ FE_TOWARDZERO = 1,
+#define FE_TOWARDZERO FE_TOWARDZERO
+ FE_UPWARD = 2,
+#define FE_UPWARD FE_UPWARD
+ FE_DOWNWARD = 3
+#define FE_DOWNWARD FE_DOWNWARD
+ };
+
+/* Type representing exception flags. */
+typedef unsigned int fexcept_t;
+
+/* Type representing floating-point environment. We leave it as 'double'
+ for efficiency reasons (rather than writing it to a 32-bit integer). */
+typedef double fenv_t;
+
+/* If the default argument is used we use this value. */
+extern const fenv_t __fe_dfl_env;
+#define FE_DFL_ENV (&__fe_dfl_env)
+
+#ifdef __USE_GNU
+/* Floating-point environment where all exceptions are enabled. Note that
+ this is not sufficient to give you SIGFPE. */
+extern const fenv_t __fe_enabled_env;
+# define FE_ENABLED_ENV (&__fe_enabled_env)
+
+/* Floating-point environment with (processor-dependent) non-IEEE floating
+ point. */
+extern const fenv_t __fe_nonieee_env;
+# define FE_NONIEEE_ENV (&__fe_nonieee_env)
+
+/* Floating-point environment with all exceptions enabled. Note that
+ just evaluating this value will set the processor into 'FPU
+ exceptions imprecise recoverable' mode, which may cause a significant
+ performance penalty (but have no other visible effect). */
+extern const fenv_t *__fe_nomask_env (void);
+# define FE_NOMASK_ENV (__fe_nomask_env ())
+#endif