Bug 125554 – Simple getter access performance has regressed by 1.5x since release safari

• Status: NEW
• Component: JavaScriptCore

[Oliver Hunt]

So this simple benchmark:
var j = 1;
var o = {get foo() { return j+=0.31; } }

var start = new Date;
var result = 0;
for (var i = 0; i < 10000000; i++)
    result += o.foo

var end = new Date;
print("Took: " + (end -start) + "ms. Result -> " + result);


Is now 1.5x slower on trunk than in released safari.

I wonder if this is due to calling convention changes, so i've cc'd michael.

Haven't had time to analyse at all as i came across this while working on caching prototype accessor lookups

[David Kilzer (:ddkilzer)]

<rdar://problem/28227246>

[Saam Barati]

I wonder if this is still the case. I suspect we're actually much faster today for this benchmark than we used to be.

[Saam Barati]

I'll run some tests over the weekend when I have time to rollback to an old webkit.