January 2014 - ghc-tickets

Re: [GHC] #4101: Primitive constant unfolding
by GHC 13 Jan '14

13 Jan '14

#4101: Primitive constant unfolding --------------------------------------------+--------------------------- Reporter: malosh | Owner: schyler Type: bug | Status: new Priority: low | Milestone: 7.6.2 Component: Compiler | Version: 6.12.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: x86 Type of failure: Runtime performance bug | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: --------------------------------------------+--------------------------- Changes (by schyler): * cc: schyler (added) * difficulty: => Unknown * owner: => schyler -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4101#comment:12> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #1885: Improve CPR analysis
by GHC 13 Jan '14

13 Jan '14

#1885: Improve CPR analysis -------------------------------------+------------------------------------ Reporter: simonpj | Owner: Type: feature request | Status: new Priority: lowest | Milestone: 7.6.2 Component: Compiler | Version: 6.8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Changes (by simonpj): * owner: simonpj => * status: closed => new * resolution: fixed => Comment: Well, it would be good to know WHY it runs really fast. Maybe the function is being inlined... but it it was bigger it wouldn't be, and nested CPR might be just the job. I'd rather know that it was fixed (rather than just have the symptoms disappear) before closing the ticket. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1885#comment:15> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #1885: Improve CPR analysis
by GHC 13 Jan '14

13 Jan '14

#1885: Improve CPR analysis -------------------------------------+------------------------------------ Reporter: simonpj | Owner: simonpj Type: feature request | Status: closed Priority: lowest | Milestone: 7.6.2 Component: Compiler | Version: 6.8.1 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Changes (by nomeata): * status: new => closed * resolution: => fixed Comment: Just tested this with GHC 7.6.3, and with `-DPOLY_OTHER` it runs really fast. So I guess this can be closed (and looks like it is not related to nested CPR). -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1885#comment:14> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7134: ghc-7.6.0.20120810-x86_64-windows.exe -> internal error R_X86_64_PC32
by GHC 13 Jan '14

13 Jan '14

#7134: ghc-7.6.0.20120810-x86_64-windows.exe -> internal error R_X86_64_PC32 -------------------------------+---------------------------------- Reporter: cetinsert | Owner: thoughtpolice Type: bug | Status: new Priority: highest | Milestone: 7.8.1 Component: GHCi | Version: 7.6.1-rc1 Resolution: | Keywords: R_X86_64_PC32 Operating System: Windows | Architecture: x86_64 (amd64) Type of failure: GHCi crash | Difficulty: Unknown Test Case: | Blocked By: 3658 Blocking: | Related Tickets: -------------------------------+---------------------------------- Comment (by Austin Seipp <austin@…>): In [changeset:"4af1e76c701a7698ebd9b5ca3fb1394dd8b56c8d/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="4af1e76c701a7698ebd9b5ca3fb1394dd8b56c8d" Add Windows to NoSharedLibsPlatformList We're punting on full -dynamic and -dynamic-too support for Windows right now, since it's still unstable. Also, ensure "Support dynamic-too" in `ghc --info` is set to "NO" for Cabal. See issues #7134, #8228, and #5987 Signed-off-by: Austin Seipp <austin(a)well-typed.com> }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7134#comment:32> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #5987: Too many symbols in ghc package DLL
by GHC 13 Jan '14

13 Jan '14

#5987: Too many symbols in ghc package DLL -------------------------------------+------------------------------------ Reporter: igloo | Owner: thoughtpolice Type: bug | Status: new Priority: highest | Milestone: 7.10.1 Component: Compiler | Version: 7.5 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: 3658 | Related Tickets: -------------------------------------+------------------------------------ Comment (by Austin Seipp <austin@…>): In [changeset:"4af1e76c701a7698ebd9b5ca3fb1394dd8b56c8d/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="4af1e76c701a7698ebd9b5ca3fb1394dd8b56c8d" Add Windows to NoSharedLibsPlatformList We're punting on full -dynamic and -dynamic-too support for Windows right now, since it's still unstable. Also, ensure "Support dynamic-too" in `ghc --info` is set to "NO" for Cabal. See issues #7134, #8228, and #5987 Signed-off-by: Austin Seipp <austin(a)well-typed.com> }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5987#comment:29> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #1371: Add -O3
by GHC 12 Jan '14

12 Jan '14

#1371: Add -O3 ----------------------------+---------------------------------------------- Reporter: | Owner: simonmar | Status: new Type: task | Milestone: _|_ Priority: normal | Version: 6.6.1 Component: | Keywords: Compiler | Architecture: Unknown/Multiple Resolution: | Difficulty: Moderate (less than a day) Operating System: | Blocked By: Unknown/Multiple | Related Tickets: Type of failure: | None/Unknown | Test Case: | Blocking: | ----------------------------+---------------------------------------------- Comment (by carter): @schyler, who is doing that? -O3 on LLVM's opt has very version specific meaning, and (currently, according to discussions on the llvm-devs mailing list), has much less clear semantics than does -O3 in gcc. Do you have specific examples where llvm's O3 improves ghc code's perf? What LLVM version (please share). its worth noting that generally on LLVM, many optimizations are in O3 to denote experimental / doesn't always work status, and then get promoted ot O1 / O2 when they have more robust code improvement characteristics -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1371#comment:10> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #1371: Add -O3
by GHC 12 Jan '14

12 Jan '14

#1371: Add -O3 ----------------------------+---------------------------------------------- Reporter: | Owner: simonmar | Status: new Type: task | Milestone: _|_ Priority: normal | Version: 6.6.1 Component: | Keywords: Compiler | Architecture: Unknown/Multiple Resolution: | Difficulty: Moderate (less than a day) Operating System: | Blocked By: Unknown/Multiple | Related Tickets: Type of failure: | None/Unknown | Test Case: | Blocking: | ----------------------------+---------------------------------------------- Comment (by schyler): I keep seeing people use -O2 -optlo -O3 when using -fllvm. Maybe this is worth taking a look at, if anything, just to bump up some base numbers and increase the llvm optimisation level in a more friendly way. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1371#comment:9> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8590: Reduce code size of CAFs
by GHC 12 Jan '14

12 Jan '14

#8590: Reduce code size of CAFs ------------------------------------+------------------------------------- Reporter: parcs | Owner: parcs Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler (NCG) | Version: 7.7 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- The size of each CAF could be reduced by moving the code that allocates the blackhole indirection closure out from the CAF's closure body and into `newCAF`. This saves around 50 bytes of object code per CAF. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8590> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #1196: Cabal on Windows doesn't like the in-place GHCs
by GHC 12 Jan '14

12 Jan '14

#1196: Cabal on Windows doesn't like the in-place GHCs -----------------------------+--------------------------------- Reporter: igloo | Owner: igloo Type: merge | Status: closed Priority: normal | Milestone: 6.6.1 Component: Compiler | Version: 6.6 Resolution: fixed | Keywords: Operating System: Windows | Architecture: Unknown/Multiple Difficulty: Unknown | Test Case: cabal01, cabal02 -----------------------------+--------------------------------- Comment (by Ian Lynagh <igloo@…>): In [changeset:"bb318da85f98a79aef951a6aa3fbf996b75c0007/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="bb318da85f98a79aef951a6aa3fbf996b75c0007" cabal01 is broken on Windows; trac #1196 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1196#comment:6> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #1171: GHC doesn't respect the imprecise exceptions semantics
by GHC 12 Jan '14

12 Jan '14

#1171: GHC doesn't respect the imprecise exceptions semantics -------------------------------------+------------------------------------ Reporter: neil | Owner: Type: bug | Status: new Priority: low | Milestone: _|_ Component: Compiler | Version: 6.6 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: cg059 | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by Ian Lynagh <igloo@…>): In [changeset:"168c6b2a6559a30f1500dcbcf4d3b654c4897d7d/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="168c6b2a6559a30f1500dcbcf4d3b654c4897d7d" Add testcase from trac #1171 as cg059 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1171#comment:19> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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