223d1cacc5
Bug 16296 notes that fegetround is a pure function and should be marked as such in fenv.h. This patch implements that. Tested for x86_64 and x86 (testsuite, and that installed stripped shared libraries are unchanged by this patch). [BZ #16296] * math/fenv.h (fegetround): Use __attribute_pure__. * include/fenv.h (__fegetround): Likewise.
136 lines
4.5 KiB
C
136 lines
4.5 KiB
C
/* Copyright (C) 1997-2015 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/*
|
|
* ISO C99 7.6: Floating-point environment <fenv.h>
|
|
*/
|
|
|
|
#ifndef _FENV_H
|
|
#define _FENV_H 1
|
|
|
|
#include <features.h>
|
|
|
|
/* Get the architecture dependend definitions. The following definitions
|
|
are expected to be done:
|
|
|
|
fenv_t type for object representing an entire floating-point
|
|
environment
|
|
|
|
FE_DFL_ENV macro of type pointer to fenv_t to be used as the argument
|
|
to functions taking an argument of type fenv_t; in this
|
|
case the default environment will be used
|
|
|
|
fexcept_t type for object representing the floating-point exception
|
|
flags including status associated with the flags
|
|
|
|
The following macros are defined iff the implementation supports this
|
|
kind of exception.
|
|
FE_INEXACT inexact result
|
|
FE_DIVBYZERO division by zero
|
|
FE_UNDERFLOW result not representable due to underflow
|
|
FE_OVERFLOW result not representable due to overflow
|
|
FE_INVALID invalid operation
|
|
|
|
FE_ALL_EXCEPT bitwise OR of all supported exceptions
|
|
|
|
The next macros are defined iff the appropriate rounding mode is
|
|
supported by the implementation.
|
|
FE_TONEAREST round to nearest
|
|
FE_UPWARD round toward +Inf
|
|
FE_DOWNWARD round toward -Inf
|
|
FE_TOWARDZERO round toward 0
|
|
*/
|
|
#include <bits/fenv.h>
|
|
|
|
__BEGIN_DECLS
|
|
|
|
/* Floating-point exception handling. */
|
|
|
|
/* Clear the supported exceptions represented by EXCEPTS. */
|
|
extern int feclearexcept (int __excepts) __THROW;
|
|
|
|
/* Store implementation-defined representation of the exception flags
|
|
indicated by EXCEPTS in the object pointed to by FLAGP. */
|
|
extern int fegetexceptflag (fexcept_t *__flagp, int __excepts) __THROW;
|
|
|
|
/* Raise the supported exceptions represented by EXCEPTS. */
|
|
extern int feraiseexcept (int __excepts) __THROW;
|
|
|
|
/* Set complete status for exceptions indicated by EXCEPTS according to
|
|
the representation in the object pointed to by FLAGP. */
|
|
extern int fesetexceptflag (const fexcept_t *__flagp, int __excepts) __THROW;
|
|
|
|
/* Determine which of subset of the exceptions specified by EXCEPTS are
|
|
currently set. */
|
|
extern int fetestexcept (int __excepts) __THROW;
|
|
|
|
|
|
/* Rounding control. */
|
|
|
|
/* Get current rounding direction. */
|
|
extern int fegetround (void) __THROW __attribute_pure__;
|
|
|
|
/* Establish the rounding direction represented by ROUND. */
|
|
extern int fesetround (int __rounding_direction) __THROW;
|
|
|
|
|
|
/* Floating-point environment. */
|
|
|
|
/* Store the current floating-point environment in the object pointed
|
|
to by ENVP. */
|
|
extern int fegetenv (fenv_t *__envp) __THROW;
|
|
|
|
/* Save the current environment in the object pointed to by ENVP, clear
|
|
exception flags and install a non-stop mode (if available) for all
|
|
exceptions. */
|
|
extern int feholdexcept (fenv_t *__envp) __THROW;
|
|
|
|
/* Establish the floating-point environment represented by the object
|
|
pointed to by ENVP. */
|
|
extern int fesetenv (const fenv_t *__envp) __THROW;
|
|
|
|
/* Save current exceptions in temporary storage, install environment
|
|
represented by object pointed to by ENVP and raise exceptions
|
|
according to saved exceptions. */
|
|
extern int feupdateenv (const fenv_t *__envp) __THROW;
|
|
|
|
|
|
/* Include optimization. */
|
|
#ifdef __OPTIMIZE__
|
|
# include <bits/fenvinline.h>
|
|
#endif
|
|
|
|
#ifdef __USE_GNU
|
|
|
|
/* Enable individual exceptions. Will not enable more exceptions than
|
|
EXCEPTS specifies. Returns the previous enabled exceptions if all
|
|
exceptions are successfully set, otherwise returns -1. */
|
|
extern int feenableexcept (int __excepts) __THROW;
|
|
|
|
/* Disable individual exceptions. Will not disable more exceptions than
|
|
EXCEPTS specifies. Returns the previous enabled exceptions if all
|
|
exceptions are successfully disabled, otherwise returns -1. */
|
|
extern int fedisableexcept (int __excepts) __THROW;
|
|
|
|
/* Return enabled exceptions. */
|
|
extern int fegetexcept (void) __THROW;
|
|
#endif
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* fenv.h */
|