mirror of
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134 lines
4.6 KiB
C++
134 lines
4.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Peter Van der Beken.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Peter Van der Beken <peterv@propagandism.org>
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*
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __txdouble_h__
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#define __txdouble_h__
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//A trick to handle IEEE floating point exceptions on FreeBSD - E.D.
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#ifdef __FreeBSD__
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#include <ieeefp.h>
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#ifdef __alpha__
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static fp_except_t allmask = FP_X_INV|FP_X_OFL|FP_X_UFL|FP_X_DZ|FP_X_IMP;
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#else
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static fp_except_t allmask = FP_X_INV|FP_X_OFL|FP_X_UFL|FP_X_DZ|FP_X_IMP|FP_X_DNML;
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#endif
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static fp_except_t oldmask = fpsetmask(~allmask);
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#endif
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/**
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* Macros to workaround math-bugs bugs in various platforms
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*/
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/**
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* Stefan Hanske <sh990154@mail.uni-greifswald.de> reports:
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* ARM is a little endian architecture but 64 bit double words are stored
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* differently: the 32 bit words are in little endian byte order, the two words
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* are stored in big endian`s way.
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*/
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#if defined(__arm) || defined(__arm32__) || defined(__arm26__) || defined(__arm__)
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#if !defined(__VFP_FP__)
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#define FPU_IS_ARM_FPA
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#endif
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#endif
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typedef union txdpun {
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struct {
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#if defined(IS_LITTLE_ENDIAN) && !defined(FPU_IS_ARM_FPA)
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PRUint32 lo, hi;
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#else
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PRUint32 hi, lo;
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#endif
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} s;
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PRFloat64 d;
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public:
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operator double() const {
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return d;
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}
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} txdpun;
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#if (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || __GNUC__ > 2
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/**
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* This version of the macros is safe for the alias optimizations
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* that gcc does, but uses gcc-specific extensions.
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*/
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#define TX_DOUBLE_HI32(x) (__extension__ ({ txdpun u; u.d = (x); u.s.hi; }))
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#define TX_DOUBLE_LO32(x) (__extension__ ({ txdpun u; u.d = (x); u.s.lo; }))
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#else // __GNUC__
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/* We don't know of any non-gcc compilers that perform alias optimization,
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* so this code should work.
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*/
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#if defined(IS_LITTLE_ENDIAN) && !defined(FPU_IS_ARM_FPA)
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#define TX_DOUBLE_HI32(x) (((PRUint32 *)&(x))[1])
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#define TX_DOUBLE_LO32(x) (((PRUint32 *)&(x))[0])
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#else
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#define TX_DOUBLE_HI32(x) (((PRUint32 *)&(x))[0])
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#define TX_DOUBLE_LO32(x) (((PRUint32 *)&(x))[1])
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#endif
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#endif // __GNUC__
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#define TX_DOUBLE_HI32_SIGNBIT 0x80000000
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#define TX_DOUBLE_HI32_EXPMASK 0x7ff00000
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#define TX_DOUBLE_HI32_MANTMASK 0x000fffff
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#define TX_DOUBLE_IS_NaN(x) \
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((TX_DOUBLE_HI32(x) & TX_DOUBLE_HI32_EXPMASK) == TX_DOUBLE_HI32_EXPMASK && \
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(TX_DOUBLE_LO32(x) || (TX_DOUBLE_HI32(x) & TX_DOUBLE_HI32_MANTMASK)))
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#ifdef IS_BIG_ENDIAN
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#define TX_DOUBLE_NaN {{TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_MANTMASK, \
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0xffffffff}}
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#else
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#define TX_DOUBLE_NaN {{0xffffffff, \
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TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_MANTMASK}}
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#endif
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#if defined(XP_WIN)
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#define TX_DOUBLE_COMPARE(LVAL, OP, RVAL) \
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(!TX_DOUBLE_IS_NaN(LVAL) && !TX_DOUBLE_IS_NaN(RVAL) && (LVAL) OP (RVAL))
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#else
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#define TX_DOUBLE_COMPARE(LVAL, OP, RVAL) ((LVAL) OP (RVAL))
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#endif
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#endif /* __txdouble_h__ */
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