diff options
Diffstat (limited to 'lib/libm')
| -rw-r--r-- | lib/libm/arch/sparc/fenv.c | 342 | ||||
| -rw-r--r-- | lib/libm/arch/sparc64/fenv.c | 13 |
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'. */ |