JSTests/ChakraCore/test/Bugs/fabs2asmjs.js

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------

/*
This file is executed from fabs1.js

fabs from ucrtbase.dll doesn't restore the FPU Control word correctly when passed a NaN. 
This is exposed if we WScript.LoadScriptFile() code with Math.Abs(NaN) in it. 
Causing an assertion failure in SmartFPUControl. The change special-handles NaN without calling fabs
*/

function AsmModule(stdlib, foreign, heap) {
    "use asm";
    var abs = stdlib.Math.abs;
    function testOp(av) {
        av = +av;
        return +abs(av);
    };
    return {testOp : testOp};
}


var asmModule = AsmModule({Math:Math},{}, new ArrayBuffer(1<<20));


WScript.Echo(asmModule.testOp(-123.334) === 123.334);
WScript.Echo(isNaN(asmModule.testOp(NaN)));
WScript.Echo(isNaN(asmModule.testOp(-NaN)));
WScript.Echo(asmModule.testOp(Infinity) === Infinity);
WScript.Echo(asmModule.testOp(-Infinity) === Infinity);
WScript.Echo(asmModule.testOp(0.0) === 0.0);
WScript.Echo(asmModule.testOp(-0.0) === 0.0);