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Jeff Parsons 2015-11-11 18:17:37 -08:00
commit 8dff30f863
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modules/pcjs/bin/fptest.js
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/**
* @fileoverview This file tests raw floating point access using typed arrays.
* @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a>
* @version 1.0
* Created 2014-Aug-20
*
* Copyright © 2012-2015 Jeff Parsons <Jeff@pcjs.org>
*
* This file is part of PCjs, which is part of the JavaScript Machines Project (aka JSMachines)
* at <http://jsmachines.net/> and <http://pcjs.org/>.
*
* PCjs is free software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with PCjs. If not,
* see <http://www.gnu.org/licenses/gpl.html>.
*
* You are required to include the above copyright notice in every source code file of every
* copy or modified version of this work, and to display that copyright notice on every screen
* that loads or runs any version of this software (see Computer.sCopyright).
*
* Some PCjs files also attempt to load external resource files, such as character-image files,
* ROM files, and disk image files. Those external resource files are not considered part of the
* PCjs program for purposes of the GNU General Public License, and the author does not claim
* any copyright as to their contents.
*/
"use strict";
try {
/*
* If Node is running us, this will succeed, and we'll have a print()
* function (an alias for console.log). If JSC is running us instead,
* then this will fail (there is neither a global NOR a console object),
* but that's OK, because print() is a built-in function.
*
* TODO: Find a cleaner way of doing this, and while you're at it, alias
* Node's process.argv to JSC's "arguments" array, and Node's process.exit()
* to JSC's quit().
*
* UPDATE: Node *must* be used to run this test, because JSC's support for
* typed arrays is incomplete.
*/
var print = console.log;
} catch(err) {}
function toHex(v, len) {
var s = "00000000" + v.toString(16);
return "0x" + s.slice(s.length - (!len? 8 : (len < 8? len : 8))).toUpperCase();
}
var f = 3.4;
var af = new Float64Array(1);
af.set([f]); // the optional offset defaults to zero
var dv = new DataView(af.buffer);
var dw1 = dv.getUint32(0);
var dw2 = dv.getUint32(4);
print(f + " = " + toHex(dw1) + "," + toHex(dw2));