Re: [GHC] #7534: allocateRegsAndSpill: Cannot read from uninitialized register

2013-01-09 Thread GHC 
#7534: allocateRegsAndSpill: Cannot read from uninitialized register
--+-
Reporter:  erikd  |   Owner:  simonmar   
Type:  bug|  Status:  infoneeded 
Priority:  normal |   Milestone: 
   Component:  Compiler   | Version:  7.7
Keywords: |  Os:  Linux  
Architecture:  powerpc64  | Failure:  Building GHC failed
  Difficulty:  Unknown|Testcase: 
   Blockedby: |Blocking: 
 Related: |  
--+-
Changes (by simonmar):

  * status:  new = infoneeded


Comment:

 More info needed to make progress on this one, the repro case only happens
 on PPC/Linux.

-- 
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7534#comment:5
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Re: [GHC] #7534: allocateRegsAndSpill: Cannot read from uninitialized register

2013-01-07 Thread GHC 
#7534: allocateRegsAndSpill: Cannot read from uninitialized register
--+-
Reporter:  erikd  |   Owner:  simonmar   
Type:  bug|  Status:  new
Priority:  normal |   Milestone: 
   Component:  Compiler   | Version:  7.7
Keywords: |  Os:  Linux  
Architecture:  powerpc64  | Failure:  Building GHC failed
  Difficulty:  Unknown|Testcase: 
   Blockedby: |Blocking: 
 Related: |  
--+-

Comment(by simonmar):

 So the background is that this panic used to be commented out, but I
 enabled it recently because it makes debugging much easier (with the panic
 commented out, the compiler will happily generate completely bogus code
 that will crash at runtime). However, it adds another invariant, as
 mentioned in the comment: all register must be written before they are
 read (not an unreasonable assumption, I'm sure you'll agree)  I presume
 this invariant is being violated somewhere.

 To debug it you'll need to use `-ddump-cmm` and find out where the bogus
 code comes from.

-- 
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7534#comment:4
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Re: [GHC] #7534: allocateRegsAndSpill: Cannot read from uninitialized register

2013-01-01 Thread GHC 
#7534: allocateRegsAndSpill: Cannot read from uninitialized register
--+-
Reporter:  erikd  |   Owner:  simonmar   
Type:  bug|  Status:  new
Priority:  normal |   Milestone: 
   Component:  Compiler   | Version:  7.7
Keywords: |  Os:  Linux  
Architecture:  powerpc64  | Failure:  Building GHC failed
  Difficulty:  Unknown|Testcase: 
   Blockedby: |Blocking: 
 Related: |  
--+-
Changes (by simonpj):

  * owner:  = simonmar
  * difficulty:  = Unknown


Comment:

 Simon M, could this be anything to do with the new codegen path?  I'll
 asssign it to you for now.

 Simon

-- 
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7534#comment:3
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Re: [GHC] #7534: allocateRegsAndSpill: Cannot read from uninitialized register

2012-12-29 Thread GHC 
#7534: allocateRegsAndSpill: Cannot read from uninitialized register
+---
Reporter:  erikd|  Owner:   
Type:  bug  | Status:  new  
Priority:  normal   |  Component:  Compiler 
 Version:  7.7  |   Keywords:   
  Os:  Linux|   Architecture:  powerpc64
 Failure:  Building GHC failed  |  Blockedby:   
Blocking:   |Related:   
+---
Changes (by PHO):

 * cc: pho@… (added)


-- 
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7534#comment:2
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Re: [GHC] #7534: allocateRegsAndSpill: Cannot read from uninitialized register

2012-12-27 Thread GHC 
#7534: allocateRegsAndSpill: Cannot read from uninitialized register
+---
Reporter:  erikd|  Owner:   
Type:  bug  | Status:  new  
Priority:  normal   |  Component:  Compiler 
 Version:  7.7  |   Keywords:   
  Os:  Linux|   Architecture:  powerpc64
 Failure:  Building GHC failed  |  Blockedby:   
Blocking:   |Related:   
+---

Comment(by erikd):

 From `compiler/nativeGen/RegAlloc/Linear/Main.hs`:

 {{{
 -- NOTE: if the input to the NCG contains some
 -- unreachable blocks with junk code, this panic
 -- might be triggered.  Make sure you only feed
 -- sensible code into the NCG.  In CmmPipeline we
 -- call removeUnreachableBlocks at the end for this
 -- reason.
 }}}

-- 
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7534#comment:1
GHC http://www.haskell.org/ghc/
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