00f7d1f5f8
By now only the default %TypedArray%.prototype.sort compare function and the JS implementation of SameValueZero were still using the odd %_IsMinusZero intrinsic, whose semantics both included a number check (actually HeapNumber test) plus testing if the heap number stores the special -0 value. In both cases we already know that we deal with number so we can reduce it to a simple number test for -0, which can be expressed via dividing 1 by that value and checking the sign of the result. In case of the compare function, we can be even smarter and work with the reciprocal values in case x and y are equal to 0 (although long term we should probably rewrite the fast case for the typed array sorting function in C++ anyway, which will be way, way faster than our handwritten callback-style, type-feedback polluted JS implementation). R=yangguo@chromium.org Review URL: https://codereview.chromium.org/1680783002 Cr-Commit-Position: refs/heads/master@{#33833}
70 lines
2.3 KiB
JavaScript
70 lines
2.3 KiB
JavaScript
// Copyright 2013 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --allow-natives-syntax --no-fold-constants
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function add(x, y) {
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return x + y;
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}
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assertEquals(0, add(0, 0));
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assertEquals(0, add(0, 0));
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%OptimizeFunctionOnNextCall(add);
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assertEquals(-0, add(-0, -0));
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function testsin() {
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assertEquals(-0, Math.sin(-0));
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}
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testsin();
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testsin();
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%OptimizeFunctionOnNextCall(testsin);
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testsin();
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function testfloor() {
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assertEquals(-0, Math.floor(-0));
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}
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testfloor();
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testfloor();
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%OptimizeFunctionOnNextCall(testfloor);
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testfloor();
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var double_one = Math.cos(0);
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function add(a, b) {
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return a + b;
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}
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assertEquals(1, 1/add(double_one, 0));
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assertEquals(1, 1/add(0, double_one));
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%OptimizeFunctionOnNextCall(add);
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assertEquals(1/(-0 + -0), 1/add(-0, -0));
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