#11486: info tables are no longer aligned -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: bug | Status: closed Priority: high | Milestone: 8.0.1 Component: Compiler | Version: 8.1 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1847 Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): This had a small, but mostly beneficial effect on performance: https://perf.haskell.org/ghc/#revision/0dc7b36c3c261b3eccf8460581fcd3d71f6e6... As expected, there is a code size cost, which has an indirect performance cost as well (since density of real code in the instruction cache is lower). Not exactly germane to this ticket, but perhaps it would be worth experimenting with half-word-aligned info tables? Many of the info table fields are half-word-sized anyways. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11486#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler