On 2014/09/26 00:52:34, fmeawad-cr wrote:
A micro-benchmark that motivates adding the fast path is
for (var j = 0; j < 100000; j++){
for(var i = 0; i < 100; i++) {
new Array('Do Something ' + i).join('');
}
}
where a consistent 30% speedup is observed.
Without the fast path, It attempts FastOneByteArrayJoin and fails since the
string is a CONS_ONE_BYTE_STRING_TYPE, then it goes in Join, where it fails
the
Sparse Array check, then hits the one element fast case in Join.
https://codereview.chromium.org/607503004/
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