#13340: Core top-level bindings no longer deduplicated -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- This module {{{#!hs module Two where f :: Int -> Int f n = n + 1 + 1 g :: Int -> Int g n = n + 1 + 1 }}} used to (in 8.0) optimize to a definition of `g` plus `f = g`. The Common sub-expression phase noticed `f` and `g` were equal. That doesn't happen any more in HEAD and we end up with two copies of the code. The Common sub-expression pass apparently still runs, it just doesn't succeed in removing one of the bindings. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13340 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler