[swift-dev] Debugging performance regressions?

[Michael Gottesman]

> On Aug 9, 2017, at 11:34 AM, Arnold Schwaighofer via swift-dev <swift-dev at swift.org> wrote:
> 
> Mark do you have suggestions for Dave?

Also, whatever comes from this, can we document in updating the compiler.

> 
>> On Aug 9, 2017, at 11:22 AM, David Zarzycki via swift-dev <swift-dev at swift.org <mailto:swift-dev at swift.org>> wrote:
>> 
>> Any tips on how to debug performance regressions?
>> 
>> And as aside, if this test is critical enough to cause a revert, why isn’t it in the public repo?
>> 
> 
> This is part of a larger internal test.
> 
>> 
>>> On Aug 9, 2017, at 14:04, Arnold Schwaighofer <notifications at github.com <mailto:notifications at github.com>> wrote:
>>> 
>>> Hi Dave,
>>> I have reverted this commit because it broke internal bots.
>>> 
>>> import Foundation
>>> class P {
>>>     var x : Int = 0
>>>     var y : Int = 1
>>> }
>>> 
>>> let dist : (P, P) -> Double = {
>>>   (p : P, s : P)  -> Double in
>>>     sqrt(Double((p.x-s.x)*(p.x-s.x) + (p.y-s.y)*(p.y-s.y)))
>>> }
>>> fails now with expression to complex.
>>> 
>>> —
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>> 
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