And -ddump-rule-firings shows you which rules fire And -ddump-rule-rewrites shows you the before-and-after for each rule that fires Simon | -----Original Message----- | From: Libraries [mailto:libraries-bounces@haskell.org] On Behalf Of | Henning Thielemann | Sent: 23 July 2014 09:06 | To: David Feuer; libraries@haskell.org | Subject: Re: Looking for help writing some GHC RULES | | Am 23.07.2014 00:42, schrieb David Feuer: | > I'm looking for some help writing some translate/untranslate rules to | > implement fusion for a couple of basic functions (the ones I'm | looking | > at right now are takeWhile and scanr, but there may be others). I | have | > a translation for takeWhile that seems to be at least decent, and one | > for scanr that is completely untested. I've never mucked about with | > GHC RULES, however, so I don't even know where to begin. | | It is helpful to watch the simplifier working. E.g. | | -ddump-simpl-stats | | shows you the rules that fired and | | -ddump-simpl | | shows the Core outputs, that the simplifier phase produce. | | _______________________________________________ | Libraries mailing list | Libraries@haskell.org | http://www.haskell.org/mailman/listinfo/libraries