The Tor Browser: js/src/jit-test/tests/sunspider/check-math-cordic.js@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Copyright (C) Rich Moore.  All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY CONTRIBUTORS ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    24  */

    26 /////. Start CORDIC

    28 var AG_CONST = 0.6072529350;

    30 function FIXED(X)

    31 {

    32   return X * 65536.0;

    33 }

    35 function FLOAT(X)

    36 {

    37   return X / 65536.0;

    38 }

    40 function DEG2RAD(X)

    41 {

    42   return 0.017453 * (X);

    43 }

    45 var Angles = [

    46   FIXED(45.0), FIXED(26.565), FIXED(14.0362), FIXED(7.12502),

    47   FIXED(3.57633), FIXED(1.78991), FIXED(0.895174), FIXED(0.447614),

    48   FIXED(0.223811), FIXED(0.111906), FIXED(0.055953),

    49   FIXED(0.027977)

    50               ];

    53 function cordicsincos() {

    54     var X;

    55     var Y;

    56     var TargetAngle;

    57     var CurrAngle;

    58     var Step;

    60     X = FIXED(AG_CONST);         /* AG_CONST * cos(0) */

    61     Y = 0;                       /* AG_CONST * sin(0) */

    63     TargetAngle = FIXED(28.027);

    64     CurrAngle = 0;

    65     for (Step = 0; Step < 12; Step++) {

    66         var NewX;

    67         if (TargetAngle > CurrAngle) {

    68             NewX = X - (Y >> Step);

    69             Y = (X >> Step) + Y;

    70             X = NewX;

    71             CurrAngle += Angles[Step];

    72         } else {

    73             NewX = X + (Y >> Step);

    74             Y = -(X >> Step) + Y;

    75             X = NewX;

    76             CurrAngle -= Angles[Step];

    77         }

    78     }

    79     return CurrAngle;

    80 }

    82 ///// End CORDIC

    84 function cordic( runs ) {

    85   var actual;

    87   for ( var i = 0 ; i < runs ; i++ ) {

    88     actual = cordicsincos();

    89   }

    91   assertEq(actual, 1834995.3515519998)

    92 }

    94 cordic(25000);

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