On Wed, Sep 30, 2015 at 6:59 PM, dmonji <[email protected]> wrote:
> I understand that inline caching is helpful only when a particular accesses
> is repeatedly executed at the same location.
>
> It does not consider the accesses made seperately.
>
>
> For example,
> for(i=0;i<1000;i++) obj.x;
>
> Here Inline caching will be helpful. But consider following
>
>
> obj.x; obj.x; .... 1000 times..
>
>
> In this case, inline caching is not helpful because each access is made
> independently. Is that true?
>
>
> If this is the case, what is the point of patching inline caching stub at
> locations/accesses which will not be repeated.
ICs are not patched in until the second time a property access is
executed. The transition is UNINITIALIZED -> PREMONOMORPHIC ->
MONOMORPHIC. In other words:
function f(o) {
return o.x; // call site
}
var o = { x: 42 };
f(o); // call site is now premonomorphic
f(o); // call site is now monomorphic
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