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Diffstat (limited to 'winsup/cygwin/include/fenv.h')
| -rwxr-xr-x | winsup/cygwin/include/fenv.h | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/winsup/cygwin/include/fenv.h b/winsup/cygwin/include/fenv.h deleted file mode 100755 index b49033f29..000000000 --- a/winsup/cygwin/include/fenv.h +++ /dev/null @@ -1,177 +0,0 @@ -/* fenv.h - - Copyright 2010, 2011 Red Hat, Inc. - -This file is part of Cygwin. - -This software is a copyrighted work licensed under the terms of the -Cygwin license. Please consult the file "CYGWIN_LICENSE" for -details. */ - -#ifndef _FENV_H_ -#define _FENV_H_ - -#ifdef __cplusplus -extern "C" { -#endif - - -/* Primary sources: - - The Open Group Base Specifications Issue 6: - http://www.opengroup.org/onlinepubs/000095399/basedefs/fenv.h.html - - C99 Language spec (draft n1256): - <url unknown> - - Intel® 64 and IA-32 Architectures Software Developer’s Manuals: - http://www.intel.com/products/processor/manuals/ - - GNU C library manual pages: - http://www.gnu.org/software/libc/manual/html_node/Control-Functions.html - http://www.gnu.org/software/libc/manual/html_node/Rounding.html - http://www.gnu.org/software/libc/manual/html_node/FP-Exceptions.html - http://www.gnu.org/software/libc/manual/html_node/Status-bit-operations.html - - Linux online man page(s): - http://linux.die.net/man/3/fegetexcept - - The documentation quotes these sources for reference. All definitions and - code have been developed solely based on the information from these specs. - -*/ - -/* Represents the entire floating-point environment. The floating-point - environment refers collectively to any floating-point status flags and - control modes supported by the implementation. - In this implementation, the struct contains the state information from - the fstenv/fnstenv instructions and a copy of the SSE MXCSR, since GCC - uses SSE for a lot of floating-point operations. (Cygwin assumes i686 - or above these days, as does the compiler.) */ - -typedef struct _fenv_t -{ - struct _fpu_env_info { - unsigned int _fpu_cw; /* low 16 bits only. */ - unsigned int _fpu_sw; /* low 16 bits only. */ - unsigned int _fpu_tagw; /* low 16 bits only. */ - unsigned int _fpu_ipoff; - unsigned int _fpu_ipsel; - unsigned int _fpu_opoff; - unsigned int _fpu_opsel; /* low 16 bits only. */ - } _fpu; - unsigned int _sse_mxcsr; -} fenv_t; - -/* Represents the floating-point status flags collectively, including - any status the implementation associates with the flags. A floating-point - status flag is a system variable whose value is set (but never cleared) - when a floating-point exception is raised, which occurs as a side effect - of exceptional floating-point arithmetic to provide auxiliary information. - A floating-point control mode is a system variable whose value may be - set by the user to affect the subsequent behavior of floating-point - arithmetic. */ - -typedef struct _fexcept_t -{ - unsigned short _fpu_exceptions; - unsigned short _sse_exceptions; -} fexcept_t; - -/* The <fenv.h> header shall define the following constants if and only - if the implementation supports the floating-point exception by means - of the floating-point functions feclearexcept(), fegetexceptflag(), - feraiseexcept(), fesetexceptflag(), and fetestexcept(). Each expands to - an integer constant expression with values such that bitwise-inclusive - ORs of all combinations of the constants result in distinct values. */ - -#define FE_DIVBYZERO (1 << 2) -#define FE_INEXACT (1 << 5) -#define FE_INVALID (1 << 0) -#define FE_OVERFLOW (1 << 3) -#define FE_UNDERFLOW (1 << 4) - -/* This is not defined by Posix, but since x87 supports it we provide - a definition according to the same naming scheme used above. */ -#define FE_DENORMAL (1 << 1) - -/* The <fenv.h> header shall define the following constant, which is - simply the bitwise-inclusive OR of all floating-point exception - constants defined above: */ - -#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID \ - | FE_OVERFLOW | FE_UNDERFLOW | FE_DENORMAL) - -/* The <fenv.h> header shall define the following constants if and only - if the implementation supports getting and setting the represented - rounding direction by means of the fegetround() and fesetround() - functions. Each expands to an integer constant expression whose values - are distinct non-negative vales. */ - -#define FE_DOWNWARD (1) -#define FE_TONEAREST (0) -#define FE_TOWARDZERO (3) -#define FE_UPWARD (2) - -/* Precision bit values. Not defined by Posix, but follow logically. */ -#define FE_SINGLEPREC (0) -#define FE_RESERVEDPREC (1) -#define FE_DOUBLEPREC (2) -#define FE_EXTENDEDPREC (3) - -/* The <fenv.h> header shall define the following constant, which - represents the default floating-point environment (that is, the one - installed at program startup) and has type pointer to const-qualified - fenv_t. It can be used as an argument to the functions within the - <fenv.h> header that manage the floating-point environment. */ - -extern const fenv_t *_fe_dfl_env; -#define FE_DFL_ENV (_fe_dfl_env) - -/* Additional implementation-defined environments, with macro - definitions beginning with FE_ and an uppercase letter,and having - type "pointer to const-qualified fenv_t",may also be specified by - the implementation. */ - -#ifdef _GNU_SOURCE -/* If possible, the GNU C Library defines a macro FE_NOMASK_ENV which - represents an environment where every exception raised causes a trap - to occur. You can test for this macro using #ifdef. It is only defined - if _GNU_SOURCE is defined. */ -extern const fenv_t *_fe_nomask_env; -#define FE_NOMASK_ENV (_fe_nomask_env) -#endif /* _GNU_SOURCE */ - - -/* The following shall be declared as functions and may also be - defined as macros. Function prototypes shall be provided. */ -extern int feclearexcept (int excepts); -extern int fegetexceptflag (fexcept_t *flagp, int excepts); -extern int feraiseexcept (int excepts); -extern int fesetexceptflag (const fexcept_t *flagp, int excepts); -extern int fetestexcept (int excepts); -extern int fegetround (void); -extern int fesetround (int round); -extern int fegetenv (fenv_t *envp); -extern int feholdexcept (fenv_t *envp); -extern int fesetenv (const fenv_t *envp); -extern int feupdateenv (const fenv_t *envp); - -/* These are not defined in Posix, but make sense by obvious extension. */ -extern int fegetprec (void); -extern int fesetprec (int prec); - -/* This is Cygwin-custom, not from the standard, for use in the Cygwin CRT. */ -extern void _feinitialise (void); - -/* These are GNU extensions defined in glibc. */ -extern int feenableexcept (int excepts); -extern int fedisableexcept (int excepts); -extern int fegetexcept (void); - - -#ifdef __cplusplus -} -#endif - -#endif /* _FENV_H_ */ |