> On 2 Nov 2017, at 1:33 pm, Erik Eckstein <eeckst...@apple.com> wrote: > > > >> On Nov 2, 2017, at 10:51 AM, Johannes Weiß <johanneswe...@apple.com> wrote: >> >> Definitely a +1 from me, a haven't recently seen much of a difference either. >> >> Said that I do sometimes use it in a micro-benchmark just to convince myself >> we don't lose much performance on the checks. Usually it turns out fine, I'm >> happy and move on. But I guess there's some value in being able to elide a >> lot of checks just to see how much of a difference it does. And if there's a >> big difference then I'd try to optimise the program and elide unnecessary >> checks myself. Clearly -Ounchecked should never be used in any real code but >> I find having a baseline when optimising performance very helpful and >> -Ounchecked sometimes seemed like a cheap, automatic baseline for some code >> ;). >> >> And lastly I always thought having it as an 'optimisation' is a misnomer, >> it's not an optimisation as it clearly changes the semantics of the program >> quite a bit. I thought '-unsafe-remove-checks' or something describes it >> better, a bit like '-assume-single-threaded’. > > I like that idea. We could add such an option.
awesome, that's be a +💯 from me then 🙂 > > Daniel, I think that’s also what you were asking for. > > >> But probably the 'no checks' mode adds too much complexity to just keep it >> around for a questionable way to do performance baselines. >> >>> On 2 Nov 2017, at 9:52 am, Erik Eckstein via swift-dev >>> <swift-dev@swift.org> wrote: >>> >>> Hi, >>> >>> I’d like to propose to deprecate the -Ounchecked swift optimization mode. >>> >>> The -Ounchecked mode actually contradicts one of the main goals of swift: >>> to be a safe language. >>> In the past we didn’t see lot of significant performance differences >>> compared to -O (there were some improvements but also some regressions). >>> Also, we want to reduce the effort of maintaining too many different >>> optimization modes, especially because we recently added -Osize. >>> >>> Deprecating would mean that we map -Ounchecked to -O. >>> >>> If you have any comments or concerns, please let me know >>> >>> Thanks, >>> Erik >>> >>> >>> >>> _______________________________________________ >>> swift-dev mailing list >>> swift-dev@swift.org >>> https://lists.swift.org/mailman/listinfo/swift-dev _______________________________________________ swift-dev mailing list swift-dev@swift.org https://lists.swift.org/mailman/listinfo/swift-dev
