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/*↩
* Copyright (C) Rich Moore. 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 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 APPLE COMPUTER, INC. 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 OUT OF THE USE↩
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ↩
*/↩
↩
/////. Start CORDIC↩
↩
var AG_CONST = 0.6072529350;↩
↩
function FIXED(X)↩
{↩
return X * 65536.0;↩
}↩
↩
function FLOAT(X)↩
{↩
return X / 65536.0;↩
}↩
↩
function DEG2RAD(X)↩
{↩
return 0.017453 * (X);↩
}↩
↩
var Angles = [↩
FIXED(45.0), FIXED(26.565), FIXED(14.0362), FIXED(7.12502),↩
FIXED(3.57633), FIXED(1.78991), FIXED(0.895174), FIXED(0.447614),↩
FIXED(0.223811), FIXED(0.111906), FIXED(0.055953),↩
FIXED(0.027977) ↩
];↩
↩
↩
function cordicsincos() {↩
var X;↩
var Y;↩
var TargetAngle;↩
var CurrAngle;↩
var Step;↩
↩
X = FIXED(AG_CONST); /* AG_CONST * cos(0) */↩
Y = 0; /* AG_CONST * sin(0) */↩
↩
TargetAngle = FIXED(28.027);↩
CurrAngle = 0;↩
for (Step = 0; Step < 12; Step++) {↩
var NewX;↩
if (TargetAngle > CurrAngle) {↩
NewX = X - (Y >> Step);↩
Y = (X >> Step) + Y;↩
X = NewX;↩
CurrAngle += Angles[Step];↩
} else {↩
NewX = X + (Y >> Step);↩
Y = -(X >> Step) + Y;↩
X = NewX;↩
CurrAngle -= Angles[Step];↩
}↩
}↩
}↩
↩
///// End CORDIC↩
↩
function cordic( runs ) {↩
var start = new Date();↩
↩
for ( var i = 0 ; i < runs ; i++ ) {↩
cordicsincos();↩
}↩
↩
var end = new Date();↩
↩
return end.getTime() - start.getTime();↩
}↩
↩
cordic(25000);↩