Status: Accepted
Owner: ----
Labels: Type-Bug Priority-Medium
New issue 2684 by [email protected]: switch over string literals is
considerably slower than a sequence of ifs with strict equality
http://code.google.com/p/v8/issues/detail?id=2684
Compare speed:
if (x === "a") {
/* code for a */
} else if (x === "b") {
/* code for b */
} else if (x === "c") {
/* code for c */
}
with
switch (x) {
case "a"; /* code for a */ break;
case "b"; /* code for b */ break;
case "c"; /* code for c */ break;
}
See http://jsperf.com/switch-if-else/30
The reason: comparisons in the if-variant are specialized to become pointer
comparisons, in switch-variant they are always emitted through COMPARE_IC.
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