Status: Accepted
Owner: [email protected]
CC: [email protected]
Labels: Type-FeatureRequest Priority-Medium
New issue 2079 by [email protected]: Speed up calls to known local
functions
http://code.google.com/p/v8/issues/detail?id=2079
Currently they are 30% slower:
function global_fib (n) {
// Will use load-global-cell, check-function, call-known-global, which
// translates to direct call.
return (n <= 2) ? 1 : global_fib(n - 2) + global_fib(n - 1);
}
var local_fib = (function () {
function local_fib (n) {
// Will use load-context-slot, call-function, which translates
// to call through CallFunction stub.
return (n <= 2) ? 1 : local_fib(n - 2) + local_fib(n - 1);
}
return local_fib;
})();
var K = 20;
var N = 35;
function t(f) {
var start = Date.now();
for (var i = 0; i < K; i++) f(N);
return Date.now() - start;
}
print(t(global_fib));
print(t(local_fib));
% out/ia32.release/d8
known-local.js
2523
3712
Simple analysis at the parser level should tell use which local functions
are actually constants.
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