fenv improvements and cleanups

1 files changed, 92 insertions, 0 deletions

diff --git a/sys/arch/hppa64/include/fenv.h b/sys/arch/hppa64/include/fenv.h
new file mode 100644
index 00000000000..33a4ee0a879
--- /dev/null
+++ b/sys/arch/hppa64/include/fenv.h
@@ -0,0 +1,92 @@
+/*	$OpenBSD: fenv.h,v 1.1 2011/04/28 17:34:23 martynas Exp $	*/
+
+/*
+ * Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef	_HPPA64_FENV_H_
+#define	_HPPA64_FENV_H_
+
+/*
+ * Each symbol representing a floating point exception expands to an integer
+ * constant expression with values, such that bitwise-inclusive ORs of _all
+ * combinations_ of the constants result in distinct values.
+ *
+ * We use such values that allow direct bitwise operations on FPU registers.
+ */
+#define	FE_INEXACT		0x01
+#define	FE_UNDERFLOW		0x02
+#define	FE_OVERFLOW		0x04
+#define	FE_DIVBYZERO		0x08
+#define	FE_INVALID		0x10
+
+/*
+ * The following symbol is simply the bitwise-inclusive OR of all floating-point
+ * exception constants defined above.
+ */
+#define	FE_ALL_EXCEPT		(FE_INEXACT | FE_UNDERFLOW | FE_OVERFLOW | \
+				 FE_DIVBYZERO | FE_INVALID)
+#define	_MASK_SHIFT		27
+
+/*
+ * Each symbol representing the rounding direction, expands to an integer
+ * constant expression whose value is distinct non-negative value.
+ *
+ * We use such values that allow direct bitwise operations on FPU registers.
+ */
+#define	FE_TONEAREST		0x000
+#define	FE_TOWARDZERO		0x200
+#define	FE_UPWARD		0x400
+#define	FE_DOWNWARD		0x600
+
+/*
+ * The following symbol is simply the bitwise-inclusive OR of all floating-point
+ * rounding direction constants defined above.
+ */
+#define	_ROUND_MASK		(FE_TONEAREST | FE_TOWARDZERO | FE_UPWARD | \
+				 FE_DOWNWARD)
+
+/*
+ * fenv_t represents the entire floating-point environment.
+ */
+typedef	unsigned int		fenv_t;
+
+/*
+ * The following constant 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, namely fesetenv() and
+ * feupdateenv().
+ */
+extern	fenv_t			__fe_dfl_env;
+#define	FE_DFL_ENV		((const fenv_t *)&__fe_dfl_env)
+
+/*
+ * fexcept_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	unsigned int		fexcept_t;
+
+#endif	/* !_HPPA64_FENV_H_ */