#7542: GHC doesn't optimize (strict) composition with id ---------------------------------+------------------------------------------ Reporter: shachaf | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.1 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: Runtime performance bug Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by simonpj@…): commit 35f1fc957d152c520c90c6bd2330266e57578eb2 {{{ Author: Simon Peyton Jones Date: Tue Jan 22 22:46:33 2013 +0000 Allow CaseElim if the case binder is the next thing to be eval'd This makes CaseElim happen a bit more often. See Note [Case binder next] in Simplify. This came up when investigating Trac #7542. compiler/simplCore/Simplify.lhs | 32 ++++++++++++++++++++++++++------ 1 files changed, 26 insertions(+), 6 deletions(-) }}} -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7542#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler