v8/test/mjsunit/regress/regress-2596.js
dslomov@chromium.org 47d8af7616 Canonicalize NaNs on store to Fast(Float|Double) arrays
Also treat holey NaN coming from external float/double arrays correctly

BUG=2596

Review URL: https://codereview.chromium.org/12918028

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14094 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2013-03-28 13:30:16 +00:00

57 lines
2.2 KiB
JavaScript

// Copyright 2013 the V8 project authors. All rights reserved.
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//
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// Flags: --allow-natives-syntax
var bytes = new Uint8Array([
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f]); // kHoleNaN
var doubles = new Float64Array(bytes.buffer);
assertTrue(isNaN(doubles[0]));
var prototype = [2.5, 2.5];
var array = [3.5, 3.5];
array.__proto__ = prototype;
assertTrue(%HasFastDoubleElements(array));
function boom(index) {
array[index] = doubles[0];
return array[index];
}
assertTrue(isNaN(boom(0)));
assertTrue(isNaN(boom(0)));
assertTrue(isNaN(boom(0)));
// Test hydrogen
%OptimizeFunctionOnNextCall(boom);
assertTrue(isNaN(boom(0)));
assertTrue(isNaN(boom(0)));
assertTrue(isNaN(boom(0)));