c70a0f9334
If the divisor is a Power-of-2 constant, we could use shifts instead of the expensive idiv instructions, which also loose the register constraints. Review URL: https://chromiumcodereview.appspot.com/11478043 Patch from Yuqiang Xian <yuqiang.xian@intel.com>. git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13178 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
60 lines
2.0 KiB
JavaScript
60 lines
2.0 KiB
JavaScript
// Copyright 2012 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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function divp4(x) {
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return x / 4;
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}
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for (var i = 0; i < 10000; i+=4) {
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assertEquals(i >> 2, divp4(i));
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}
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assertEquals(0.5, divp4(2));
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function divn4(x) {
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return x / (-4);
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}
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for (var i = 0; i < 10000; i+=4) {
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assertEquals(-(i >> 2), divn4(i));
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}
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assertEquals(-0, divn4(0));
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function divn1(x) {
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return x / (-1);
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}
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for (var i = 0; i < 10000; i++) {
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assertEquals(-i, divn1(i));
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}
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var min_int = -(0x7FFFFFFF)-1;
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assertEquals(-min_int, divn1(min_int));
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