#15056: Wrappers inlined too late -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: 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 simonpj): Another example comes from `nofib/real/veritas`. In `Edlib.hs` we have {{{ (...) :: Xio_fn -> Xio_fn -> Xin -> Xio (...) f g xin = f xin \\\ g }}} and in `X_interface` we get {{{ x_send_argL argL = x_send x_multi_arg_esc_seq ... x_send [toEnum (length argL)] ... app ( map x_send_arg argL ) ... x_send x_end_arg_esc_seq }}} It turns out that `...` gets w/w'd (because it is CPR'd in fact), and that means it doesn't inline until phase 0. If we inline in phase 2 we get lots of fold/build fusion, which leads to a whopping 25% improvement in the allocation of the veritas benchmark. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15056#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler