mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-22 10:50:07 +00:00
179 lines
6.5 KiB
C
179 lines
6.5 KiB
C
/* Copyright (C) 1997, 1998 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 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 __P ((void));
|
|
# define FE_NOMASK_ENV (__fe_nomask_env ())
|
|
#endif
|
|
|
|
#if defined __OPTIMIZE__ && !defined _SOFT_FLOAT
|
|
/* Inline definition for fegetround. */
|
|
# define fegetround() \
|
|
(__extension__ ({ int __fegetround_result; \
|
|
__asm__ ("mcrfs 7,7 ; mfcr %0" \
|
|
: "=r"(__fegetround_result) : : "cr7"); \
|
|
__fegetround_result & 3; }))
|
|
|
|
/* Inline definition for feraiseexcept. */
|
|
# define feraiseexcept(__excepts) \
|
|
(__extension__ ({ if (__builtin_constant_p (__excepts) \
|
|
&& ((__excepts) & -(__excepts)) == 0 \
|
|
&& (__excepts) != FE_INVALID) { \
|
|
if ((__excepts) != 0) \
|
|
__asm__ __volatile__ \
|
|
("mtfsb1 %0" \
|
|
: : "i"(32 - __builtin_ffs (__excepts))); \
|
|
} else \
|
|
(feraiseexcept) (__excepts); }))
|
|
|
|
/* Inline definition for feclearexcept. */
|
|
# define feclearexcept(__excepts) \
|
|
(__extension__ ({ if (__builtin_constant_p (__excepts) \
|
|
&& ((__excepts) & -(__excepts)) == 0 \
|
|
&& (__excepts) != FE_INVALID) { \
|
|
if ((__excepts) != 0) \
|
|
__asm__ __volatile__ \
|
|
("mtfsb0 %0" \
|
|
: : "i"(32 - __builtin_ffs (__excepts))); \
|
|
} else \
|
|
(feclearexcept) (__excepts); }))
|
|
#endif /* __OPTIMIZE__ && !_SOFT_FLOAT */
|