[GHC] #7192: Bug in -fregs-graph with -fnew-codegen

[GHC]

#7192: Bug in -fregs-graph with -fnew-codegen
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  benl            
        Type:  bug               |      Status:  new             
    Priority:  highest           |   Milestone:  7.8.1           
   Component:  Compiler          |     Version:  7.7             
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:  4258            
     Related:                    |  
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Comment(by marlowsd@…):

 commit 4270d7e7485b124dd153399dfe3f571253dc0d1d
 {{{
 Author: Simon Marlow <marlowsd at gmail.com>
 Date:   Tue Nov 13 11:43:09 2012 +0000

     Fix the Slow calling convention (#7192)

     The Slow calling convention passes the closure in R1, but we were
     ignoring this and hoping it would work, which it often did.  However,
     this bug seems to have been the cause of #7192, because the
     graph-colouring allocator is more sensitive to having correct liveness
     information on jumps.

  compiler/cmm/CmmCallConv.hs      |    6 +++---
  compiler/cmm/CmmParse.y          |    2 +-
  compiler/cmm/MkGraph.hs          |   32 ++++++++------------------------
  compiler/codeGen/StgCmmBind.hs   |   21 +++++++++++----------
  compiler/codeGen/StgCmmExpr.hs   |    4 ++--
  compiler/codeGen/StgCmmHeap.hs   |   12 ++++--------
  compiler/codeGen/StgCmmLayout.hs |    2 +-
  7 files changed, 30 insertions(+), 49 deletions(-)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7192#comment:10>
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