fenv for sparc; mostly cloned from sparc64

2 files changed, 354 insertions, 1 deletions

diff --git a/lib/libm/arch/sparc/fenv.c b/lib/libm/arch/sparc/fenv.c
new file mode 100644
index 00000000000..7f9544654ae
--- /dev/null
+++ b/lib/libm/arch/sparc/fenv.c
@@ -0,0 +1,342 @@
+/*	$OpenBSD: fenv.c,v 1.1 2011/04/25 21:04:29 martynas Exp $	*/
+/*	$NetBSD: fenv.c,v 1.1 2011/01/31 00:19:33 christos Exp $	*/
+
+/*-
+ * 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
+ */
+#include <sys/cdefs.h>
+
+#include <assert.h>
+#include <fenv.h>
+
+#define _DIAGASSERT(x) ((void) 0)
+
+/* Load floating-point state register (all 64bits) */
+#define	__ldxfsr(__r)	__asm__	__volatile__		\
+	("ld %0, %%fsr" : : "m" (__r))
+
+/* Save floating-point state register (all 64bits) */
+#define	__stxfsr(__r)	__asm__	__volatile__		\
+	("st %%fsr, %0" : "=m" (*(__r)))
+
+/*
+ * 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().
+ */
+fenv_t __fe_dfl_env = 0;
+
+/*
+ * The feclearexcept() function clears the supported floating-point exceptions
+ * represented by `excepts'.
+ */
+int
+feclearexcept(int excepts)
+{
+	fexcept_t r;
+	int ex;
+
+	_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+	ex = excepts & FE_ALL_EXCEPT;
+
+	__stxfsr(&r);
+	r &= ~ex;
+	__ldxfsr(r);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * The fegetexceptflag() function stores an implementation-defined
+ * representation of the states of the floating-point status flags indicated
+ * by the argument excepts in the object pointed to by the argument flagp.
+ */
+int
+fegetexceptflag(fexcept_t *flagp, int excepts)
+{
+	fexcept_t r;
+	int ex;
+
+	_DIAGASSERT(flagp != NULL);
+	_DIAGASSERT((excepts & ~_FE_ALL_EXCEPT) == 0);
+
+	ex = excepts & FE_ALL_EXCEPT;
+
+	__stxfsr(&r);
+	*flagp = r & ex;
+
+	/* Success */
+	return 0;
+}
+
+
+/*
+ * This function sets the floating-point status flags indicated by the argument
+ * `excepts' to the states stored in the object pointed to by `flagp'. It does
+ * NOT raise any floating-point exceptions, but only sets the state of the flags.
+ */
+int
+fesetexceptflag(const fexcept_t *flagp, int excepts)
+{
+	fexcept_t r;
+	int ex;
+
+	_DIAGASSERT(flagp != NULL);
+	_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+	ex = excepts & FE_ALL_EXCEPT;
+
+	__stxfsr(&r);
+	r &= ~ex;
+	r |= *flagp & ex;
+	__ldxfsr(r);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * The feraiseexcept() function raises the supported floating-point exceptions
+ * represented by the argument `excepts'.
+ *
+ * The order in which these floating-point exceptions are raised is unspecified
+ * (by the standard).
+ */
+int
+feraiseexcept(int excepts)
+{
+	volatile double d;
+	int ex;
+
+	_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+	ex = excepts & FE_ALL_EXCEPT;
+
+	/*
+	 * With a compiler that supports the FENV_ACCESS pragma properly, simple
+	 * expressions like '0.0 / 0.0' should be sufficient to generate traps.
+	 * Unfortunately, we need to bring a volatile variable into the equation
+	 * to prevent incorrect optimizations.
+	 */
+	if (ex & FE_INVALID) {
+		d = 0.0;
+		d = 0.0 / d;
+	}
+	if (ex & FE_DIVBYZERO) {
+		d = 0.0;
+		d = 1.0 / d;
+	}
+	if (ex & FE_OVERFLOW) {
+		d = 0x1.ffp1023;
+		d *= 2.0;
+	}
+	if (ex & FE_UNDERFLOW) {
+		d = 0x1p-1022;
+		d /= 0x1p1023;
+	}
+	if (ex & FE_INEXACT) {
+		d = 0x1p-1022;
+		d += 1.0;
+	}
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * The fetestexcept() function determines which of a specified subset of the
+ * floating-point exception flags are currently set. The `excepts' argument
+ * specifies the floating-point status flags to be queried.
+ */
+int
+fetestexcept(int excepts)
+{
+	fexcept_t r;
+
+	_DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+	__stxfsr(&r);
+
+	return r & (excepts & FE_ALL_EXCEPT);
+}
+
+/*
+ * The fegetround() function gets the current rounding direction.
+ */
+int
+fegetround(void)
+{
+	fenv_t r;
+
+	__stxfsr(&r);
+
+	return (r >> _ROUND_SHIFT) & _ROUND_MASK;
+}
+
+/*
+ * The fesetround() function establishes the rounding direction represented by
+ * its argument `round'. If the argument is not equal to the value of a rounding
+ * direction macro, the rounding direction is not changed.
+ */
+int
+fesetround(int round)
+{
+	fenv_t r;
+
+	_DIAGASSERT((round & ~_ROUND_MASK) == 0);
+	if (round & ~_ROUND_MASK)
+		return -1;
+
+	__stxfsr(&r);
+	r &= ~(_ROUND_MASK << _ROUND_SHIFT);
+	r |= round << _ROUND_SHIFT;
+	__ldxfsr(r);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * The fegetenv() function attempts to store the current floating-point
+ * environment in the object pointed to by envp.
+ */
+int
+fegetenv(fenv_t *envp)
+{
+	_DIAGASSERT(envp != NULL);
+
+	__stxfsr(envp);
+
+	/* Success */
+	return 0;
+}
+
+
+/*
+ * The feholdexcept() function saves the current floating-point environment
+ * in the object pointed to by envp, clears the floating-point status flags, and
+ * then installs a non-stop (continue on floating-point exceptions) mode, if
+ * available, for all floating-point exceptions.
+ */
+int
+feholdexcept(fenv_t *envp)
+{
+	fenv_t r;
+
+	_DIAGASSERT(envp != NULL);
+
+	__stxfsr(&r);
+	*envp = r;
+	r &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
+	__ldxfsr(r);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * The fesetenv() function attempts to establish the floating-point environment
+ * represented by the object pointed to by envp. The argument `envp' points
+ * to an object set by a call to fegetenv() or feholdexcept(), or equal a
+ * floating-point environment macro. The fesetenv() function does not raise
+ * floating-point exceptions, but only installs the state of the floating-point
+ * status flags represented through its argument.
+ */
+int
+fesetenv(const fenv_t *envp)
+{
+	_DIAGASSERT(envp != NULL);
+
+	__ldxfsr(*envp);
+
+	/* Success */
+	return 0;
+}
+
+
+/*
+ * The feupdateenv() function saves the currently raised floating-point
+ * exceptions in its automatic storage, installs the floating-point environment
+ * represented by the object pointed to by `envp', and then raises the saved
+ * floating-point exceptions. The argument `envp' shall point to an object set
+ * by a call to feholdexcept() or fegetenv(), or equal a floating-point
+ * environment macro.
+ */
+int
+feupdateenv(const fenv_t *envp)
+{
+	fexcept_t r;
+
+	_DIAGASSERT(envp != NULL);
+
+	__stxfsr(&r);
+	__ldxfsr(*envp);
+
+	_DIAGASSERT((r & ~FE_ALL_EXCEPT) == 0);
+	feraiseexcept(r & FE_ALL_EXCEPT);
+
+	/* Success */
+	return 0;
+}
+
+/*
+ * The following functions are extentions to the standard
+ */
+int
+feenableexcept(int mask)
+{
+	fenv_t old_r, new_r;
+
+	__stxfsr(&old_r);
+	new_r = old_r | ((mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
+	__ldxfsr(new_r);
+
+	return (old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT;
+}
+
+int
+fedisableexcept(int mask)
+{
+	fenv_t old_r, new_r;
+
+	__stxfsr(&old_r);
+	new_r = old_r & ~((mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
+	__ldxfsr(new_r);
+
+	return (old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT;
+}
+
+int
+fegetexcept(void)
+{
+	fenv_t r;
+
+	__stxfsr(&r);
+	return (r & _ENABLE_MASK) >> _FPUSW_SHIFT;
+}
diff --git a/lib/libm/arch/sparc64/fenv.c b/lib/libm/arch/sparc64/fenv.c
index 4a233982ed0..75fb354c6d4 100644
--- a/lib/libm/arch/sparc64/fenv.c
+++ b/lib/libm/arch/sparc64/fenv.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: fenv.c,v 1.1 2011/04/24 00:35:22 martynas Exp $	*/
+/*	$OpenBSD: fenv.c,v 1.2 2011/04/25 21:04:29 martynas Exp $	*/
 /*	$NetBSD: fenv.c,v 1.1 2011/01/31 00:19:33 christos Exp $	*/
 
 /*-
@@ -40,6 +40,17 @@
 	("stx %%fsr, %0" : "=m" (*(__r)))
 
 /*
+ * 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().
+ */
+fenv_t __fe_dfl_env = 0;
+
+/*
  * The feclearexcept() function clears the supported floating-point exceptions
  * represented by `excepts'.
  */