In V8 currently most assumptions are made and checked at uses, not at
definitions.
Consider for example:
var p = new Point(1, 2);
function add(p) {
return p.x + p.y
}
add(p);
Here the fact that p.x and p.y is numbers is checked at the +
operation. If add is optimized for these assumptions and you pass
point that contains strings in x and y then function add will
deoptimize. But this will happen when you execute add not when you
create point with string values in x and y.
Vyacheslav Egorov
On Tue, Nov 6, 2012 at 3:44 PM, Wyatt <[email protected]> wrote:
> Interesting! But wouldn't each of these cases nullify any assumptions
> made by the type-specializing JIT?
>
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