Cygwin: fenv.h: Add feature test macros, fix values
- feenableexcept,fedisableexcept, fegetexcept are GNU-only - fegetprec, fesetprec are Solaris, use __MISC_VISIBLE - _feinitialise is Cygwin-internal only - Replace self-named FP precision values to values from http://www.open-std.org/jtc1/sc22//WG14/www/docs/n752.htm as used by Solaris. - Change return value of fesetprec to adhere to the above document and Solaris. - Document fegetprec, fesetprec as Solaris functions, not as GNU functions Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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Corinna Vinschen
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166913fb23
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40958b0d86
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@ -391,18 +391,30 @@ fegetprec (void)
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return (cw & FE_CW_PREC_MASK) >> FE_CW_PREC_SHIFT;
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}
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/* Changes the currently selected precision to prec. If prec does not
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correspond to one of the supported rounding modes nothing is changed.
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fesetprec returns zero if it changed the precision, or a nonzero value
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if the mode is not supported. */
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/* http://www.open-std.org/jtc1/sc22//WG14/www/docs/n752.htm:
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The fesetprec function establishes the precision represented by its
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argument prec. If the argument does not match a precision macro, the
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precision is not changed.
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The fesetprec function returns a nonzero value if and only if the
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argument matches a precision macro (that is, if and only if the requested
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precision can be established). */
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int
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fesetprec (int prec)
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{
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unsigned short cw;
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/* Will succeed for any valid value of the input parameter. */
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if (prec < FE_SINGLEPREC || prec > FE_EXTENDEDPREC)
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return EINVAL;
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switch (prec)
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{
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case FE_FLTPREC:
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case FE_DBLPREC:
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case FE_LDBLPREC:
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break;
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default:
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return 0;
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}
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/* Get control word. */
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__asm__ volatile ("fnstcw %0" : "=m" (cw) : );
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@ -415,7 +427,7 @@ fesetprec (int prec)
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__asm__ volatile ("fldcw %0" :: "m" (cw));
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/* Indicate success. */
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return 0;
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return 1;
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}
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/* Set up the FPU and SSE environment at the start of execution. */
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@ -106,11 +106,14 @@ typedef __uint32_t fexcept_t;
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#define FE_TOWARDZERO (3)
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#define FE_UPWARD (2)
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/* Precision bit values. Not defined by Posix, but follow logically. */
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#define FE_SINGLEPREC (0)
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#define FE_RESERVEDPREC (1)
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#define FE_DOUBLEPREC (2)
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#define FE_EXTENDEDPREC (3)
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/* Only Solaris and QNX implement fegetprec/fesetprec. As Solaris, use the
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values defined by http://www.open-std.org/jtc1/sc22//WG14/www/docs/n752.htm
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QNX defines different values. */
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#if __MISC_VISIBLE
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#define FE_FLTPREC (0)
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#define FE_DBLPREC (2)
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#define FE_LDBLPREC (3)
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#endif
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/* The <fenv.h> header shall define the following constant, which
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represents the default floating-point environment (that is, the one
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@ -138,30 +141,34 @@ extern const fenv_t *_fe_nomask_env;
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/* The following shall be declared as functions and may also be
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defined as macros. Function prototypes shall be provided. */
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extern int feclearexcept (int excepts);
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extern int fegetexceptflag (fexcept_t *flagp, int excepts);
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extern int feraiseexcept (int excepts);
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extern int fesetexceptflag (const fexcept_t *flagp, int excepts);
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extern int fetestexcept (int excepts);
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extern int feclearexcept (int __excepts);
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extern int fegetexceptflag (fexcept_t *__flagp, int __excepts);
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extern int feraiseexcept (int __excepts);
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extern int fesetexceptflag (const fexcept_t *__flagp, int __excepts);
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extern int fetestexcept (int __excepts);
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extern int fegetround (void);
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extern int fesetround (int round);
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extern int fegetenv (fenv_t *envp);
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extern int feholdexcept (fenv_t *envp);
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extern int fesetenv (const fenv_t *envp);
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extern int feupdateenv (const fenv_t *envp);
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/* These are not defined in Posix, but make sense by obvious extension. */
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extern int fegetprec (void);
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extern int fesetprec (int prec);
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/* This is Cygwin-custom, not from the standard, for use in the Cygwin CRT. */
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extern void _feinitialise (void);
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extern int fesetround (int __round);
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extern int fegetenv (fenv_t *__envp);
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extern int feholdexcept (fenv_t *__envp);
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extern int fesetenv (const fenv_t *__envp);
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extern int feupdateenv (const fenv_t *__envp);
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#if __GNU_VISIBLE
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/* These are GNU extensions defined in glibc. */
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extern int feenableexcept (int excepts);
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extern int fedisableexcept (int excepts);
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extern int feenableexcept (int __excepts);
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extern int fedisableexcept (int __excepts);
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extern int fegetexcept (void);
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#endif
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#if __MISC_VISIBLE
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extern int fegetprec (void);
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extern int fesetprec (int __prec);
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#endif
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#ifdef __INSIDE_CYGWIN__
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/* This is Cygwin-custom, not from the standard, for use in the Cygwin CRT. */
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extern void _feinitialise ();
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#endif
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#ifdef __cplusplus
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}
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@ -1319,8 +1319,6 @@ also IEEE Std 1003.1-2008 (POSIX.1-2008).</para>
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fedisableexcept
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feenableexcept
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fegetexcept
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fegetprec
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fesetprec
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ffsl
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ffsll
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fgets_unlocked
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@ -1443,6 +1441,8 @@ also IEEE Std 1003.1-2008 (POSIX.1-2008).</para>
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acltotext
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endmntent
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facl
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fegetprec
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fesetprec
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futimesat
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getmntent
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memalign
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