Updates:
Summary: Bounds check elimination does not work for constant indices
Comment #1 on issue 3367 by [email protected]: Bounds check
elimination does not work for constant indices
http://code.google.com/p/v8/issues/detail?id=3367
You're holding it wrong :-P
BCE currently doesn't look at bounds checks for constant indices. If you
introduce an addition (which can't be constant-folded), bounds checks are
eliminated as expected:
function f(i) {
return a[i+7] * a[i+6] * a[i+5] * a[i+4] * a[i+3] * a[i+2] * a[i+1] *
a[i+0];
}
f(0); // etc...
The same would happen quite naturally inside a loop.
But yeah, this is one of the things we could improve about our BCE
implementation :-)
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