1. 20 Aug, 2007 1 commit
  2. 27 Jul, 2007 1 commit
    • Simon Marlow's avatar
      Pointer Tagging · 6015a94f
      Simon Marlow authored
        
      This patch implements pointer tagging as per our ICFP'07 paper "Faster
      laziness using dynamic pointer tagging".  It improves performance by
      10-15% for most workloads, including GHC itself.
      
      The original patches were by Alexey Rodriguez Yakushev
      <mrchebas@gmail.com>, with additions and improvements by me.  I've
      re-recorded the development as a single patch.
      
      The basic idea is this: we use the low 2 bits of a pointer to a heap
      object (3 bits on a 64-bit architecture) to encode some information
      about the object pointed to.  For a constructor, we encode the "tag"
      of the constructor (e.g. True vs. False), for a function closure its
      arity.  This enables some decisions to be made without dereferencing
      the pointer, which speeds up some common operations.  In particular it
      enables us to avoid costly indirect jumps in many cases.
      
      More information in the commentary:
      
      http://hackage.haskell.org/trac/ghc/wiki/Commentary/Rts/HaskellExecution/PointerTagging
      6015a94f
  3. 27 Jun, 2007 2 commits
    • Michael D. Adams's avatar
      First pass at implementing info tables for CPS · f96e9aa0
      Michael D. Adams authored
      This is a fairly complete implementation, however
      two 'panic's have been placed in the critical path
      where the implementation is still a bit lacking so
      do not expect it to run quite yet.
      
      One call to panic is because we still need to create
      a GC block for procedures that don't have them yet.
      (cmm/CmmCPS.hs:continuationToProc)
      
      The other is due to the need to convert from a
      ContinuationInfo to a CmmInfo.
      (codeGen/CgInfoTbls.hs:emitClosureCodeAndInfoTable)
      (codeGen/CgInfoTbls.hs:emitReturnTarget)
      f96e9aa0
    • Michael D. Adams's avatar
  4. 25 May, 2007 1 commit
    • Michael D. Adams's avatar
      Moved global register saving from the backend to codeGen · bd3a364d
      Michael D. Adams authored
      This frees the Cmm data type from keeping a list of live global registers
      in CmmCall which helps prepare for the CPS conversion phase.
      
      CPS conversion does its own liveness analysis and takes input that should
      not directly refer to parameter registers (e.g. R1, F5, D3, L2).  Since
      these are the only things which could occur in the live global register
      list, CPS conversion makes that field of the CmmCall constructor obsolite.
      
      Once the CPS conversion pass is fully implemented, global register saving
      will move from codeGen into the CPS pass.  Until then, this patch
      is worth scrutinizing and testing to ensure it doesn't cause any performance
      or correctness problems as the code passed to the backends by the CPS
      converting will look very similar to the code that this patch makes codeGen
      pass to the backend.
      bd3a364d
  5. 22 Oct, 2006 1 commit
  6. 25 Oct, 2006 1 commit
  7. 11 Oct, 2006 1 commit
    • Simon Marlow's avatar
      Module header tidyup, phase 1 · 49c98d14
      Simon Marlow authored
      This patch is a start on removing import lists and generally tidying
      up the top of each module.  In addition to removing import lists:
      
         - Change DATA.IOREF -> Data.IORef etc.
         - Change List -> Data.List etc.
         - Remove $Id$
         - Update copyrights
         - Re-order imports to put non-GHC imports last
         - Remove some unused and duplicate imports
      49c98d14
  8. 20 Jun, 2006 1 commit
  9. 07 Apr, 2006 1 commit
    • Simon Marlow's avatar
      Reorganisation of the source tree · 0065d5ab
      Simon Marlow authored
      Most of the other users of the fptools build system have migrated to
      Cabal, and with the move to darcs we can now flatten the source tree
      without losing history, so here goes.
      
      The main change is that the ghc/ subdir is gone, and most of what it
      contained is now at the top level.  The build system now makes no
      pretense at being multi-project, it is just the GHC build system.
      
      No doubt this will break many things, and there will be a period of
      instability while we fix the dependencies.  A straightforward build
      should work, but I haven't yet fixed binary/source distributions.
      Changes to the Building Guide will follow, too.
      0065d5ab
  10. 03 May, 2005 1 commit
  11. 13 Aug, 2004 1 commit