mirror of https://github.com/lukechilds/node.git
Ryan Dahl
13 years ago
307 changed files with 17132 additions and 32382 deletions
@ -1,11 +0,0 @@ |
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<html> |
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<head> |
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<style> |
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body { text-align: center; } |
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</style> |
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</head> |
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<body> |
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<script type="text/javascript" src="splay-tree.js"></script> |
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<script type="text/javascript" src="v.js"></script> |
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</body> |
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</html> |
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@ -1,326 +0,0 @@ |
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// Copyright 2011 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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|
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/** |
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* Constructs a Splay tree. A splay tree is a self-balancing binary |
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* search tree with the additional property that recently accessed |
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* elements are quick to access again. It performs basic operations |
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* such as insertion, look-up and removal in O(log(n)) amortized time. |
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* |
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* @constructor |
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*/ |
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function SplayTree() { |
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}; |
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/** |
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* Pointer to the root node of the tree. |
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* |
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* @type {SplayTree.Node} |
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* @private |
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*/ |
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SplayTree.prototype.root_ = null; |
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/** |
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* @return {boolean} Whether the tree is empty. |
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*/ |
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SplayTree.prototype.isEmpty = function() { |
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return !this.root_; |
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}; |
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/** |
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* Inserts a node into the tree with the specified key and value if |
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* the tree does not already contain a node with the specified key. If |
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* the value is inserted, it becomes the root of the tree. |
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* |
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* @param {number} key Key to insert into the tree. |
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* @param {*} value Value to insert into the tree. |
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*/ |
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SplayTree.prototype.insert = function(key, value) { |
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if (this.isEmpty()) { |
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this.root_ = new SplayTree.Node(key, value); |
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return; |
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} |
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// Splay on the key to move the last node on the search path for
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// the key to the root of the tree.
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this.splay_(key); |
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if (this.root_.key == key) { |
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return; |
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} |
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var node = new SplayTree.Node(key, value); |
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if (key > this.root_.key) { |
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node.left = this.root_; |
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node.right = this.root_.right; |
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this.root_.right = null; |
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} else { |
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node.right = this.root_; |
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node.left = this.root_.left; |
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this.root_.left = null; |
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} |
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this.root_ = node; |
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}; |
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/** |
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* Removes a node with the specified key from the tree if the tree |
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* contains a node with this key. The removed node is returned. If the |
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* key is not found, an exception is thrown. |
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* |
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* @param {number} key Key to find and remove from the tree. |
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* @return {SplayTree.Node} The removed node. |
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*/ |
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SplayTree.prototype.remove = function(key) { |
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if (this.isEmpty()) { |
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throw Error('Key not found: ' + key); |
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} |
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this.splay_(key); |
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if (this.root_.key != key) { |
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throw Error('Key not found: ' + key); |
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} |
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var removed = this.root_; |
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if (!this.root_.left) { |
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this.root_ = this.root_.right; |
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} else { |
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var right = this.root_.right; |
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this.root_ = this.root_.left; |
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// Splay to make sure that the new root has an empty right child.
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this.splay_(key); |
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// Insert the original right child as the right child of the new
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// root.
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this.root_.right = right; |
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} |
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return removed; |
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}; |
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/** |
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* Returns the node having the specified key or null if the tree doesn't contain |
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* a node with the specified key. |
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* |
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* @param {number} key Key to find in the tree. |
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* @return {SplayTree.Node} Node having the specified key. |
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*/ |
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SplayTree.prototype.find = function(key) { |
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if (this.isEmpty()) { |
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return null; |
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} |
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this.splay_(key); |
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return this.root_.key == key ? this.root_ : null; |
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}; |
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/** |
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* @return {SplayTree.Node} Node having the maximum key value. |
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*/ |
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SplayTree.prototype.findMax = function(opt_startNode) { |
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if (this.isEmpty()) { |
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return null; |
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} |
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var current = opt_startNode || this.root_; |
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while (current.right) { |
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current = current.right; |
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} |
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return current; |
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}; |
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/** |
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* @return {SplayTree.Node} Node having the maximum key value that |
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* is less than the specified key value. |
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*/ |
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SplayTree.prototype.findGreatestLessThan = function(key) { |
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if (this.isEmpty()) { |
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return null; |
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} |
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// Splay on the key to move the node with the given key or the last
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// node on the search path to the top of the tree.
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this.splay_(key); |
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// Now the result is either the root node or the greatest node in
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// the left subtree.
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if (this.root_.key < key) { |
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return this.root_; |
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} else if (this.root_.left) { |
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return this.findMax(this.root_.left); |
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} else { |
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return null; |
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} |
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}; |
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/** |
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* @return {Array<*>} An array containing all the keys of tree's nodes. |
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*/ |
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SplayTree.prototype.exportKeys = function() { |
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var result = []; |
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if (!this.isEmpty()) { |
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this.root_.traverse_(function(node) { result.push(node.key); }); |
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} |
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return result; |
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}; |
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/** |
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* Perform the splay operation for the given key. Moves the node with |
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* the given key to the top of the tree. If no node has the given |
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* key, the last node on the search path is moved to the top of the |
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* tree. This is the simplified top-down splaying algorithm from: |
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* "Self-adjusting Binary Search Trees" by Sleator and Tarjan |
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* |
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* @param {number} key Key to splay the tree on. |
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* @private |
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*/ |
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SplayTree.prototype.splay_ = function(key) { |
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if (this.isEmpty()) { |
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return; |
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} |
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// Create a dummy node. The use of the dummy node is a bit
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// counter-intuitive: The right child of the dummy node will hold
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// the L tree of the algorithm. The left child of the dummy node
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// will hold the R tree of the algorithm. Using a dummy node, left
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// and right will always be nodes and we avoid special cases.
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var dummy, left, right; |
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dummy = left = right = new SplayTree.Node(null, null); |
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var current = this.root_; |
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while (true) { |
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if (key < current.key) { |
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if (!current.left) { |
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break; |
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} |
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if (key < current.left.key) { |
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// Rotate right.
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var tmp = current.left; |
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current.left = tmp.right; |
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tmp.right = current; |
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current = tmp; |
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if (!current.left) { |
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break; |
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} |
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} |
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// Link right.
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right.left = current; |
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right = current; |
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current = current.left; |
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} else if (key > current.key) { |
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if (!current.right) { |
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break; |
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} |
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if (key > current.right.key) { |
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// Rotate left.
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var tmp = current.right; |
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current.right = tmp.left; |
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tmp.left = current; |
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current = tmp; |
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if (!current.right) { |
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break; |
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} |
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} |
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// Link left.
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left.right = current; |
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left = current; |
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current = current.right; |
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} else { |
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break; |
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} |
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} |
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// Assemble.
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left.right = current.left; |
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right.left = current.right; |
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current.left = dummy.right; |
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current.right = dummy.left; |
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this.root_ = current; |
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}; |
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/** |
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* Constructs a Splay tree node. |
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* |
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* @param {number} key Key. |
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* @param {*} value Value. |
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*/ |
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SplayTree.Node = function(key, value) { |
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this.key = key; |
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this.value = value; |
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}; |
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/** |
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* @type {SplayTree.Node} |
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*/ |
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SplayTree.Node.prototype.left = null; |
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/** |
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* @type {SplayTree.Node} |
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*/ |
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SplayTree.Node.prototype.right = null; |
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/** |
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* Performs an ordered traversal of the subtree starting at |
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* this SplayTree.Node. |
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* |
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* @param {function(SplayTree.Node)} f Visitor function. |
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* @private |
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*/ |
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SplayTree.Node.prototype.traverse_ = function(f) { |
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var current = this; |
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while (current) { |
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var left = current.left; |
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if (left) left.traverse_(f); |
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f(current); |
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current = current.right; |
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} |
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}; |
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SplayTree.prototype.traverseBreadthFirst = function (f) { |
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if (f(this.root_.value)) return; |
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var stack = [this.root_]; |
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var length = 1; |
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while (length > 0) { |
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var new_stack = new Array(stack.length * 2); |
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var new_length = 0; |
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for (var i = 0; i < length; i++) { |
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var n = stack[i]; |
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var l = n.left; |
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var r = n.right; |
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if (l) { |
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if (f(l.value)) return; |
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new_stack[new_length++] = l; |
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} |
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if (r) { |
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if (f(r.value)) return; |
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new_stack[new_length++] = r; |
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} |
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} |
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stack = new_stack; |
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length = new_length; |
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} |
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}; |
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@ -1,387 +0,0 @@ |
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// Copyright 2011 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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/** |
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* This function provides requestAnimationFrame in a cross browser way. |
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* http://paulirish.com/2011/requestanimationframe-for-smart-animating/
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*/ |
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if ( !window.requestAnimationFrame ) { |
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window.requestAnimationFrame = ( function() { |
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return window.webkitRequestAnimationFrame || |
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window.mozRequestAnimationFrame || |
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window.oRequestAnimationFrame || |
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window.msRequestAnimationFrame || |
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function(callback, element) { |
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window.setTimeout( callback, 1000 / 60 ); |
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}; |
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} )(); |
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} |
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var kNPoints = 8000; |
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var kNModifications = 20; |
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var kNVisiblePoints = 200; |
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var kDecaySpeed = 20; |
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var kPointRadius = 4; |
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var kInitialLifeForce = 100; |
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var livePoints = void 0; |
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var dyingPoints = void 0; |
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var scene = void 0; |
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var renderingStartTime = void 0; |
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var scene = void 0; |
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var pausePlot = void 0; |
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var splayTree = void 0; |
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function Point(x, y, z, payload) { |
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this.x = x; |
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this.y = y; |
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this.z = z; |
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this.next = null; |
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this.prev = null; |
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this.payload = payload; |
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this.lifeForce = kInitialLifeForce; |
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} |
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Point.prototype.color = function () { |
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return "rgba(0, 0, 0, " + (this.lifeForce / kInitialLifeForce) + ")"; |
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}; |
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Point.prototype.decay = function () { |
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this.lifeForce -= kDecaySpeed; |
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return this.lifeForce <= 0; |
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}; |
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function PointsList() { |
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this.head = null; |
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this.count = 0; |
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} |
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PointsList.prototype.add = function (point) { |
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if (this.head !== null) this.head.prev = point; |
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point.next = this.head; |
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this.head = point; |
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this.count++; |
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} |
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PointsList.prototype.remove = function (point) { |
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if (point.next !== null) { |
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point.next.prev = point.prev; |
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} |
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if (point.prev !== null) { |
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point.prev.next = point.next; |
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} else { |
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this.head = point.next; |
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} |
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this.count--; |
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} |
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function GeneratePayloadTree(depth, tag) { |
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if (depth == 0) { |
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return { |
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array : [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ], |
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string : 'String for key ' + tag + ' in leaf node' |
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}; |
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} else { |
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return { |
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left: GeneratePayloadTree(depth - 1, tag), |
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right: GeneratePayloadTree(depth - 1, tag) |
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}; |
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} |
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} |
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// To make the benchmark results predictable, we replace Math.random
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// with a 100% deterministic alternative.
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Math.random = (function() { |
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var seed = 49734321; |
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return function() { |
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// Robert Jenkins' 32 bit integer hash function.
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seed = ((seed + 0x7ed55d16) + (seed << 12)) & 0xffffffff; |
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seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff; |
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seed = ((seed + 0x165667b1) + (seed << 5)) & 0xffffffff; |
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seed = ((seed + 0xd3a2646c) ^ (seed << 9)) & 0xffffffff; |
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seed = ((seed + 0xfd7046c5) + (seed << 3)) & 0xffffffff; |
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seed = ((seed ^ 0xb55a4f09) ^ (seed >>> 16)) & 0xffffffff; |
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return (seed & 0xfffffff) / 0x10000000; |
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}; |
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})(); |
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function GenerateKey() { |
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// The benchmark framework guarantees that Math.random is
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// deterministic; see base.js.
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return Math.random(); |
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} |
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function CreateNewPoint() { |
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// Insert new node with a unique key.
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var key; |
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do { key = GenerateKey(); } while (splayTree.find(key) != null); |
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var point = new Point(Math.random() * 40 - 20, |
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Math.random() * 40 - 20, |
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Math.random() * 40 - 20, |
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GeneratePayloadTree(5, "" + key)); |
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livePoints.add(point); |
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splayTree.insert(key, point); |
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return key; |
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} |
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function ModifyPointsSet() { |
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if (livePoints.count < kNPoints) { |
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for (var i = 0; i < kNModifications; i++) { |
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CreateNewPoint(); |
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} |
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} else if (kNModifications === 20) { |
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kNModifications = 80; |
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kDecay = 30; |
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} |
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for (var i = 0; i < kNModifications; i++) { |
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var key = CreateNewPoint(); |
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var greatest = splayTree.findGreatestLessThan(key); |
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if (greatest == null) { |
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var point = splayTree.remove(key).value; |
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} else { |
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var point = splayTree.remove(greatest.key).value; |
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} |
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livePoints.remove(point); |
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point.payload = null; |
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dyingPoints.add(point); |
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} |
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} |
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|
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function PausePlot(width, height, size) { |
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var canvas = document.createElement("canvas"); |
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canvas.width = this.width = width; |
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canvas.height = this.height = height; |
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document.body.appendChild(canvas); |
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this.ctx = canvas.getContext('2d'); |
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this.maxPause = 0; |
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this.size = size; |
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|
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// Initialize cyclic buffer for pauses.
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this.pauses = new Array(this.size); |
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this.start = this.size; |
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this.idx = 0; |
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} |
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PausePlot.prototype.addPause = function (p) { |
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if (this.idx === this.size) { |
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this.idx = 0; |
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} |
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if (this.idx === this.start) { |
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this.start++; |
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} |
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if (this.start === this.size) { |
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this.start = 0; |
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} |
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this.pauses[this.idx++] = p; |
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}; |
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PausePlot.prototype.iteratePauses = function (f) { |
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if (this.start < this.idx) { |
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for (var i = this.start; i < this.idx; i++) { |
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f.call(this, i - this.start, this.pauses[i]); |
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} |
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} else { |
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for (var i = this.start; i < this.size; i++) { |
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f.call(this, i - this.start, this.pauses[i]); |
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} |
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|
|||
var offs = this.size - this.start; |
|||
for (var i = 0; i < this.idx; i++) { |
|||
f.call(this, i + offs, this.pauses[i]); |
|||
} |
|||
} |
|||
}; |
|||
|
|||
|
|||
PausePlot.prototype.draw = function () { |
|||
var first = null; |
|||
this.iteratePauses(function (i, v) { |
|||
if (first === null) { |
|||
first = v; |
|||
} |
|||
this.maxPause = Math.max(v, this.maxPause); |
|||
}); |
|||
|
|||
var dx = this.width / this.size; |
|||
var dy = this.height / this.maxPause; |
|||
|
|||
this.ctx.save(); |
|||
this.ctx.clearRect(0, 0, 480, 240); |
|||
this.ctx.beginPath(); |
|||
this.ctx.moveTo(1, dy * this.pauses[this.start]); |
|||
var p = first; |
|||
this.iteratePauses(function (i, v) { |
|||
var delta = v - p; |
|||
var x = 1 + dx * i; |
|||
var y = dy * v; |
|||
this.ctx.lineTo(x, y); |
|||
if (delta > 2 * (p / 3)) { |
|||
this.ctx.font = "bold 12px sans-serif"; |
|||
this.ctx.textBaseline = "bottom"; |
|||
this.ctx.fillText(v + "ms", x + 2, y); |
|||
} |
|||
p = v; |
|||
}); |
|||
this.ctx.strokeStyle = "black"; |
|||
this.ctx.stroke(); |
|||
this.ctx.restore(); |
|||
} |
|||
|
|||
|
|||
function Scene(width, height) { |
|||
var canvas = document.createElement("canvas"); |
|||
canvas.width = width; |
|||
canvas.height = height; |
|||
document.body.appendChild(canvas); |
|||
|
|||
this.ctx = canvas.getContext('2d'); |
|||
this.width = canvas.width; |
|||
this.height = canvas.height; |
|||
|
|||
// Projection configuration.
|
|||
this.x0 = canvas.width / 2; |
|||
this.y0 = canvas.height / 2; |
|||
this.z0 = 100; |
|||
this.f = 1000; // Focal length.
|
|||
|
|||
// Camera is rotating around y-axis.
|
|||
this.angle = 0; |
|||
} |
|||
|
|||
|
|||
Scene.prototype.drawPoint = function (x, y, z, color) { |
|||
// Rotate the camera around y-axis.
|
|||
var rx = x * Math.cos(this.angle) - z * Math.sin(this.angle); |
|||
var ry = y; |
|||
var rz = x * Math.sin(this.angle) + z * Math.cos(this.angle); |
|||
|
|||
// Perform perspective projection.
|
|||
var px = (this.f * rx) / (rz - this.z0) + this.x0; |
|||
var py = (this.f * ry) / (rz - this.z0) + this.y0; |
|||
|
|||
this.ctx.save(); |
|||
this.ctx.fillStyle = color |
|||
this.ctx.beginPath(); |
|||
this.ctx.arc(px, py, kPointRadius, 0, 2 * Math.PI, true); |
|||
this.ctx.fill(); |
|||
this.ctx.restore(); |
|||
}; |
|||
|
|||
|
|||
Scene.prototype.drawDyingPoints = function () { |
|||
var point_next = null; |
|||
for (var point = dyingPoints.head; point !== null; point = point_next) { |
|||
// Rotate the scene around y-axis.
|
|||
scene.drawPoint(point.x, point.y, point.z, point.color()); |
|||
|
|||
point_next = point.next; |
|||
|
|||
// Decay the current point and remove it from the list
|
|||
// if it's life-force ran out.
|
|||
if (point.decay()) { |
|||
dyingPoints.remove(point); |
|||
} |
|||
} |
|||
}; |
|||
|
|||
|
|||
Scene.prototype.draw = function () { |
|||
this.ctx.save(); |
|||
this.ctx.clearRect(0, 0, this.width, this.height); |
|||
this.drawDyingPoints(); |
|||
this.ctx.restore(); |
|||
|
|||
this.angle += Math.PI / 90.0; |
|||
}; |
|||
|
|||
|
|||
function render() { |
|||
if (typeof renderingStartTime === 'undefined') { |
|||
renderingStartTime = Date.now(); |
|||
} |
|||
|
|||
ModifyPointsSet(); |
|||
|
|||
scene.draw(); |
|||
|
|||
var renderingEndTime = Date.now(); |
|||
var pause = renderingEndTime - renderingStartTime; |
|||
pausePlot.addPause(pause); |
|||
renderingStartTime = renderingEndTime; |
|||
|
|||
pausePlot.draw(); |
|||
|
|||
div.innerHTML = |
|||
livePoints.count + "/" + dyingPoints.count + " " + |
|||
pause + "(max = " + pausePlot.maxPause + ") ms" ; |
|||
|
|||
// Schedule next frame.
|
|||
requestAnimationFrame(render); |
|||
} |
|||
|
|||
|
|||
function init() { |
|||
livePoints = new PointsList; |
|||
dyingPoints = new PointsList; |
|||
|
|||
splayTree = new SplayTree(); |
|||
|
|||
scene = new Scene(640, 480); |
|||
|
|||
div = document.createElement("div"); |
|||
document.body.appendChild(div); |
|||
|
|||
pausePlot = new PausePlot(480, 240, 160); |
|||
} |
|||
|
|||
|
|||
init(); |
|||
render(); |
|||
@ -1,77 +0,0 @@ |
|||
// Copyright 2006-2008 the V8 project authors. All rights reserved.
|
|||
// Redistribution and use in source and binary forms, with or without
|
|||
// modification, are permitted provided that the following conditions are
|
|||
// met:
|
|||
//
|
|||
// * Redistributions of source code must retain the above copyright
|
|||
// notice, this list of conditions and the following disclaimer.
|
|||
// * Redistributions in binary form must reproduce the above
|
|||
// copyright notice, this list of conditions and the following
|
|||
// disclaimer in the documentation and/or other materials provided
|
|||
// with the distribution.
|
|||
// * Neither the name of Google Inc. nor the names of its
|
|||
// contributors may be used to endorse or promote products derived
|
|||
// from this software without specific prior written permission.
|
|||
//
|
|||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|||
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|||
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|||
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|||
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|||
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|||
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|||
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|||
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|||
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|||
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|||
|
|||
#ifndef V8_COMPILER_INTRINSICS_H_ |
|||
#define V8_COMPILER_INTRINSICS_H_ |
|||
|
|||
namespace v8 { |
|||
namespace internal { |
|||
|
|||
class CompilerIntrinsics { |
|||
public: |
|||
// Returns number of zero bits preceding least significant 1 bit.
|
|||
// Undefined for zero value.
|
|||
INLINE(static int CountTrailingZeros(uint32_t value)); |
|||
|
|||
// Returns number of zero bits following most significant 1 bit.
|
|||
// Undefined for zero value.
|
|||
INLINE(static int CountLeadingZeros(uint32_t value)); |
|||
}; |
|||
|
|||
#ifdef __GNUC__ |
|||
int CompilerIntrinsics::CountTrailingZeros(uint32_t value) { |
|||
return __builtin_ctz(value); |
|||
} |
|||
|
|||
int CompilerIntrinsics::CountLeadingZeros(uint32_t value) { |
|||
return __builtin_clz(value); |
|||
} |
|||
|
|||
#elif defined(_MSC_VER) |
|||
|
|||
#pragma intrinsic(_BitScanForward) |
|||
#pragma intrinsic(_BitScanReverse) |
|||
|
|||
int CompilerIntrinsics::CountTrailingZeros(uint32_t value) { |
|||
unsigned long result; //NOLINT
|
|||
_BitScanForward(&result, static_cast<long>(value)); //NOLINT
|
|||
return static_cast<int>(result); |
|||
} |
|||
|
|||
int CompilerIntrinsics::CountLeadingZeros(uint32_t value) { |
|||
unsigned long result; //NOLINT
|
|||
_BitScanReverse(&result, static_cast<long>(value)); //NOLINT
|
|||
return 31 - static_cast<int>(result); |
|||
} |
|||
|
|||
#else |
|||
#error Unsupported compiler |
|||
#endif |
|||
|
|||
} } // namespace v8::internal
|
|||
|
|||
#endif // V8_COMPILER_INTRINSICS_H_
|
|||
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Reference in new issue