66 lines
2.7 KiB
JavaScript
66 lines
2.7 KiB
JavaScript
/**
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* @fileoverview This file tests raw floating point access using typed arrays.
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* @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a>
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* @version 1.0
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* @suppress {missingProperties}
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* Created 2014-Aug-20
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*
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* Copyright © 2012-2014 Jeff Parsons <Jeff@pcjs.org>
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*
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* This file is part of PCjs, which is part of the JavaScript Machines Project (aka JSMachines)
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* at <http://jsmachines.net/> and <http://pcjs.org/>.
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*
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* PCjs is free software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation, either version 3
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* of the License, or (at your option) any later version.
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*
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* PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCjs. If not,
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* see <http://www.gnu.org/licenses/gpl.html>.
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*
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* You are required to include the above copyright notice in every source code file of every
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* copy or modified version of this work, and to display that copyright notice on every screen
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* that loads or runs any version of this software (see Computer.sCopyright).
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*
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* Some PCjs files also attempt to load external resource files, such as character-image files,
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* ROM files, and disk image files. Those external resource files are not considered part of the
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* PCjs program for purposes of the GNU General Public License, and the author does not claim
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* any copyright as to their contents.
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*/
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"use strict";
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try {
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/*
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* If Node is running us, this will succeed, and we'll have a print()
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* function (an alias for console.log). If JSC is running us instead,
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* then this will fail (there is neither a global NOR a console object),
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* but that's OK, because print() is a built-in function.
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*
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* TODO: Find a cleaner way of doing this, and while you're at it, alias
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* Node's process.argv to JSC's "arguments" array, and Node's process.exit()
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* to JSC's quit().
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*
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* UPDATE: Node *must* be used to run this test, because JSC's support for
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* typed arrays is incomplete.
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*/
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var print = console.log;
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} catch(err) {}
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function toHex(v, len) {
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var s = "00000000" + v.toString(16);
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return "0x" + s.slice(s.length - (!len? 8 : (len < 8? len : 8))).toUpperCase();
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}
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var f = 3.4;
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var af = new Float64Array(1);
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af.set([f]); // the optional offset defaults to zero
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var dv = new DataView(af.buffer);
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var dw1 = dv.getUint32(0);
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var dw2 = dv.getUint32(4);
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print(f + " = " + toHex(dw1) + "," + toHex(dw2));
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