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epoc32/include/stdapis/fenv.h
branchSymbian2
changeset 2 2fe1408b6811
parent 0 061f57f2323e 
--- a/epoc32/include/stdapis/fenv.h	Tue Nov 24 13:55:44 2009 +0000
+++ b/epoc32/include/stdapis/fenv.h	Tue Mar 16 16:12:26 2010 +0000
@@ -1,1 +1,268 @@
-fenv.h
+/*--------------------------------------------------------------------
+ *© Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
+ *--------------------------------------------------------------------
+*/
+/*-
+ * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: src/lib/msun/arm/fenv.h,v 1.5 2005/03/16 19:03:45 das Exp $
+ */
+
+#ifndef	_FENV_H_
+#define	_FENV_H_
+
+#include <sys/_types.h>
+
+#ifdef __WINSCW__
+/*to supress warnings 'arguments not used in function' 
+This warnings crop up wherever fevn.h is included. So
+it is desirable to supress it here. The warning arises as a
+fact that these arguments are used within macros which get
+get replaced at the time of pre-processing and thus the 
+compiler(s)warning 'argument/variable is not used in function*/
+#pragma warn_unusedarg off
+#endif //__WINSCW__
+
+typedef	__uint32_t	fenv_t;
+typedef	__uint32_t	fexcept_t;
+
+/* Exception flags */
+#define	FE_INVALID	0x0001
+#define	FE_DIVBYZERO	0x0002
+#define	FE_OVERFLOW	0x0004
+#define	FE_UNDERFLOW	0x0008
+#define	FE_INEXACT	0x0010
+#define	FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_INEXACT | \
+			 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+/* Rounding modes */
+#define	FE_TONEAREST	0x0000
+#define	FE_TOWARDZERO	0x0001
+#define	FE_UPWARD	0x0002
+#define	FE_DOWNWARD	0x0003
+#define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
+			 FE_UPWARD | FE_TOWARDZERO)
+__BEGIN_DECLS
+
+/* Default floating-point environment */
+extern const fenv_t	__fe_dfl_env;
+#define	FE_DFL_ENV	(&__fe_dfl_env)
+
+/* We need to be able to map status flag positions to mask flag positions */
+#define _FPUSW_SHIFT	16
+#define	_ENABLE_MASK	(FE_ALL_EXCEPT << _FPUSW_SHIFT)
+
+#ifdef	ARM_HARD_FLOAT
+#define	__rfs(__fpsr)	__asm __volatile("rfs %0" : "=r" (*(__fpsr)))
+#define	__wfs(__fpsr)	__asm __volatile("wfs %0" : : "r" (__fpsr))
+#else
+#define __rfs(__fpsr)
+#define __wfs(__fpsr)
+#endif
+
+static __inline int
+feclearexcept(int __excepts)
+{
+	#ifdef __SYMBIAN32__
+	fexcept_t __fpsr = 0;
+	#else
+	fexcept_t __fpsr ;
+	#endif //__SYMBIAN32__
+
+	__rfs(&__fpsr);
+	__fpsr &= ~__excepts;
+	__wfs(__fpsr);
+	return (0);
+}
+
+static __inline int
+fegetexceptflag(fexcept_t *__flagp, int __excepts)
+{
+	#ifdef __SYMBIAN32__
+	fexcept_t __fpsr = 0;
+	#else
+	fexcept_t __fpsr ;
+	#endif //__SYMBIAN32__
+
+	__rfs(&__fpsr);
+	*__flagp = __fpsr & __excepts;
+	return (0);
+}
+
+static __inline int
+fesetexceptflag(const fexcept_t *__flagp, int __excepts)
+{
+	#ifdef __SYMBIAN32__
+	fexcept_t __fpsr = 0;
+	#else
+	fexcept_t __fpsr ;
+	#endif //__SYMBIAN32__
+
+	__rfs(&__fpsr);
+	__fpsr &= ~__excepts;
+	__fpsr |= *__flagp & __excepts;
+	__wfs(__fpsr);
+	return (0);
+}
+
+static __inline int
+feraiseexcept(int __excepts)
+{
+	fexcept_t __ex = __excepts;
+
+	fesetexceptflag(&__ex, __excepts);	/* XXX */
+	return (0);
+}
+
+static __inline int
+fetestexcept(int __excepts)
+{
+	#ifdef __SYMBIAN32__
+	fexcept_t __fpsr = 0;
+	#else
+	fexcept_t __fpsr ;
+	#endif //__SYMBIAN32__
+
+	__rfs(&__fpsr);
+	return (__fpsr & __excepts);
+}
+
+static __inline int
+fegetround(void)
+{
+
+	/*
+	 * Apparently, the rounding mode is specified as part of the
+	 * instruction format on ARM, so the dynamic rounding mode is
+	 * indeterminate.  Some FPUs may differ.
+	 */
+	return (-1);
+}
+
+static __inline int
+fesetround(int __round)
+{
+
+	return (-1);
+}
+
+static __inline int
+fegetenv(fenv_t *__envp)
+{
+
+	__rfs(__envp);
+	return (0);
+}
+
+static __inline int
+feholdexcept(fenv_t *__envp)
+{
+	#ifdef __SYMBIAN32__
+	fenv_t __env = 0;
+	#else
+	fenv_t __env ;
+	#endif //__SYMBIAN32__
+
+	__rfs(&__env);
+	*__envp = __env;
+	__env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
+	__wfs(__env);
+	return (0);
+}
+
+static __inline int
+fesetenv(const fenv_t *__envp)
+{
+
+	__wfs(*__envp);
+	return (0);
+}
+
+static __inline int
+feupdateenv(const fenv_t *__envp)
+{
+	#ifdef __SYMBIAN32__
+	fexcept_t __fpsr = 0;
+	#else
+	fexcept_t __fpsr ;
+	#endif //__SYMBIAN32__
+
+	__rfs(&__fpsr);
+	__wfs(*__envp);
+	feraiseexcept(__fpsr & FE_ALL_EXCEPT);
+	return (0);
+}
+
+#if __BSD_VISIBLE
+
+static __inline int
+feenableexcept(int __mask)
+{
+	#ifdef __SYMBIAN32__
+	fenv_t __old_fpsr = 0, __new_fpsr=  0;
+	#else
+	fenv_t __old_fpsr, __new_fpsr;
+	#endif //__SYMBIAN32__
+
+	__rfs(&__old_fpsr);
+	__new_fpsr = __old_fpsr | (__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT;
+	__wfs(__new_fpsr);
+	return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
+}
+
+static __inline int
+fedisableexcept(int __mask)
+{
+
+	#ifdef __SYMBIAN32__
+	fenv_t __old_fpsr =0, __new_fpsr =0;
+	#else
+	fenv_t __old_fpsr, __new_fpsr;
+	#endif //__SYMBIAN32__
+	
+	__rfs(&__old_fpsr);
+	__new_fpsr = __old_fpsr & ~((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
+	__wfs(__new_fpsr);
+	return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
+}
+
+static __inline int
+fegetexcept(void)
+{
+	#ifdef __SYMBIAN32__
+	fexcept_t __fpsr = 0;
+	#else
+	fexcept_t __fpsr ;
+	#endif //__SYMBIAN32__
+
+	__rfs(&__fpsr);
+	return ((__fpsr & _ENABLE_MASK) >> _FPUSW_SHIFT);
+}
+
+#endif /* __BSD_VISIBLE */
+
+__END_DECLS
+
+#endif	/* !_FENV_H_ */
API_REF/Public_API