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Bug 1071448 - Speed up binary searches using a bitwise operation. r=adw

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This commit is contained in:
Alexander J. Vincent 2014-09-22 23:47:08 -07:00
parent 332c4fb2c9
commit b2864affa3
1 changed files with 2 additions and 1 deletions
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3
toolkit/modules/BinarySearch.jsm
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@ -60,7 +60,8 @@ this.BinarySearch = Object.freeze({
let low = 0;
let high = array.length - 1;
while (low <= high) {
let mid = Math.floor((low + high) / 2);
// Thanks to http://jsperf.com/code-review-1480 for this tip.
let mid = (low + high) >> 1;
let cmp = comparator(target, array[mid]);
if (cmp == 0)
return [true, mid];