Re: opt out of accursedUnutterablePerformIO

Am 05.03.2018 um 06:07 schrieb John Wiegley:

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"DF" == David Feuer writes:

DF> For the record, the "public" version of runRW# is called DF> unsafeDupablePerformIO. It would be a good idea to find out if it can DF> be used throughout bytestring without a significant penalty. If so, DF> that would eliminate a bunch of scary stuff. If not, it would be nice DF> to understand why.

In my tests, using unsafeDupablePerformIO instead of accursedUnutterablePerformIO induces a 15% performance penalty.

Thanks. I believe there are cases where people (other than me) would like to have the option of sacrificing 15% performance to get rid of aUPerformIO, if only for testing/bug-hunting purposes. Cheers Ben