#13220: Performance regressions in testsuite from join points -------------------------------------+------------------------------------- Reporter: lukemaurer | Owner: lukemaurer Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: JoinPoints Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): I now believe the culprit is this added line in originally `lintCoreVar`, now `lintVarOcc`: {{{#!diff + ; ensureEqTys ty ty' $ mkBndrOccTypeMismatchMsg var' var ty' ty }}} Reasoning: `perf` showed that when running with `-dcore-lint`, the single function that takes the most time after the garbage collector is `nonDetCmpTypeX_go`. Before the join points patch, it took 6.5% of the total time. After, it took 9.1% of the total time. And there seems to be nothing that corresponds to this `ensureEqTys` call before the join points patch. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13220#comment:25 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler