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More speed boost: use typed array for hash tables

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This commit is contained in:
Vitaly Puzrin 2014-02-14 03:07:40 +04:00
parent f4c1a86ed9
commit a9c5e58eea
2 changed files with 16 additions and 4 deletions
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5
lib/zlib/deflate.js
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@ -660,8 +660,8 @@ function deflateInit2(strm, level, method, windowBits, memLevel, strategy) {
s.method = method; s.method = method;
// precreate & prefill head/prev arrays to optimize v8 types // precreate & prefill head/prev arrays to optimize v8 types
s.head = new Array(s.hash_size); s.head = utils.array16Create(s.hash_size);
s.prev = new Array(s.w_size); s.prev = utils.array16Create(s.w_size);
utils.fill(s.head, 0); utils.fill(s.head, 0);
utils.fill(s.prev, 0); utils.fill(s.prev, 0);
@ -804,6 +804,7 @@ function deflate(strm, flush) {
*/ */
if (flush === c.Z_FULL_FLUSH) { if (flush === c.Z_FULL_FLUSH) {
//CLEAR_HASH(s); /* forget history */ //CLEAR_HASH(s); /* forget history */
// !!!! seems to be bug -> 0 in original
s.head[s.hash_size - 1] = -1; s.head[s.hash_size - 1] = -1;
if (s.lookahead === 0) { if (s.lookahead === 0) {

15
lib/zlib/utils.js
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@ -56,10 +56,21 @@ exports.arrayCreate = function (length) {
}; };
exports.array16Create = function (length) {
if ((typeof Uint16Array !== 'undefined')) {
return new Uint16Array(length);
}
// Fallback to ordinary array
return new Array(length);
};
exports.fill = function (buf, val) { exports.fill = function (buf, val) {
var len = buf.length; var len = buf.length;
if (!len) { return;} if (!len) { return;}
while (--len) { buf[len] = val} while (--len) { buf[len] = val; }
} };