September 2013 - ghc-tickets

[GHC] #8231: Haskell's Run Time System doesn't save electricity
by GHC 05 Sep '13

05 Sep '13

#8231: Haskell's Run Time System doesn't save electricity --------------------------+------------------------------------------------ Reporter: | Owner: UnixJunkie | Status: new Type: bug | Milestone: Priority: normal | Version: 7.4.1 Component: | Operating System: Linux Runtime System | Type of failure: None/Unknown Keywords: energy | Test Case: provided in the description saving | Blocking: Architecture: x86_64 | (amd64) | Difficulty: | Unknown | Blocked By: | Related Tickets: | --------------------------+------------------------------------------------ Someone provided me with a sequential implementation of the fibonacci function. Out of curiosity, it was compiled with -threaded and we played with the -N option of the runtime. That same someone noticed some suspicious behavior. I notice the same and so report about it: all cores specified by $np are fully used while there is no change in the wallclock time spent by the program. The code: --- {{{ import Text.Printf fib :: Int -> Int fib 0 = 0 fib 1 = 1 fib n = fib (n - 1) + fib (n - 2) i = 44 main = printf "n=%d => %d\n" i (fib i) }}} --- The build: --- {{{ ghc -threaded -O2 sequential_fib.hs }}} --- The run (on an eight cores machine), shell is Bash: --- {{{ for np in `seq 1 8` ; do time ./sequential_fib +RTS -N$np ; done }}} --- The output: --- {{{ n=44 => 701408733 real 0m10.838s user 0m10.817s sys 0m0.000s n=44 => 701408733 real 0m10.762s user 0m12.009s sys 0m9.165s n=44 => 701408733 real 0m10.774s user 0m24.846s sys 0m6.800s n=44 => 701408733 real 0m10.769s user 0m33.654s sys 0m8.413s n=44 => 701408733 real 0m11.222s user 0m47.427s sys 0m7.336s n=44 => 701408733 real 0m11.217s user 0m57.872s sys 0m7.752s n=44 => 701408733 real 0m11.208s user 1m9.172s sys 0m7.112s n=44 => 701408733 real 0m11.204s user 1m18.909s sys 0m7.768s }}} --- -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8231> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7684: cgrun071 segfaults
by GHC 05 Sep '13

05 Sep '13

#7684: cgrun071 segfaults ----------------------------------+---------------------------------- Reporter: tibbe | Owner: leroux Type: bug | Status: new Priority: normal | Milestone: 7.8.1 Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: MacOS X | Architecture: x86_64 (amd64) Type of failure: Runtime crash | Difficulty: Unknown Test Case: cgrun071 | Blocked By: Blocking: | Related Tickets: ----------------------------------+---------------------------------- Comment (by carter): someone who's got a ghc clang build working or using a different flavor of gcc newer than 4.2 on their mac should try and run this test case. (my theory could be completely wrong though) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7684#comment:18> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7684: cgrun071 segfaults
by GHC 05 Sep '13

05 Sep '13

#7684: cgrun071 segfaults ----------------------------------+---------------------------------- Reporter: tibbe | Owner: leroux Type: bug | Status: new Priority: normal | Milestone: 7.8.1 Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: MacOS X | Architecture: x86_64 (amd64) Type of failure: Runtime crash | Difficulty: Unknown Test Case: cgrun071 | Blocked By: Blocking: | Related Tickets: ----------------------------------+---------------------------------- Comment (by carter): I have a theory: the pop count code was only added after 7.6 release I believe, and may have never been tested on macs. Xcode 4.6 and earlier provides a very very old gcc, gcc 4.2. gcc4.2 doesn't support sse4 instructions: http://gcc.gnu.org/onlinedocs/gcc-4.2.4/gcc/i386-and- x86_002d64-Options.html#i386-and-x86_002d64-Options -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7684#comment:17> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7243: regression: acceptable foreign result types
by GHC 05 Sep '13

05 Sep '13

#7243: regression: acceptable foreign result types ----------------------------------------------+---------------------------- Reporter: dmwit | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.6.2 Component: Compiler (FFI) | Version: 7.6.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: x86_64 Type of failure: GHC rejects valid program | (amd64) Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ----------------------------------------------+---------------------------- Changes (by shelarcy): * cc: shelarcy@… (added) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7243#comment:6> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #5610: Improve "Unacceptable argument type in foreign declaration" error message
by GHC 05 Sep '13

05 Sep '13

#5610: Improve "Unacceptable argument type in foreign declaration" error message -------------------------------------------------+------------------------- Reporter: bgamari | Owner: Type: feature request | Status: new Priority: high | Milestone: 7.4.1 Component: Compiler (Type checker) | Version: Resolution: | 7.6.1-rc1 Operating System: Unknown/Multiple | Keywords: Type of failure: Incorrect warning at | Architecture: compile-time | Unknown/Multiple Test Case: | Difficulty: Blocking: | Unknown | Blocked By: | Related Tickets: -------------------------------------------------+------------------------- Changes (by shelarcy): * cc: shelarcy@… (added) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5610#comment:18> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #5610: Improve "Unacceptable argument type in foreign declaration" error message
by GHC 05 Sep '13

05 Sep '13

#5610: Improve "Unacceptable argument type in foreign declaration" error message -------------------------------------------------+------------------------- Reporter: bgamari | Owner: Type: feature request | Status: new Priority: high | Milestone: 7.4.1 Component: Compiler (Type checker) | Version: Resolution: | 7.6.1-rc1 Operating System: Unknown/Multiple | Keywords: Type of failure: Incorrect warning at | Architecture: compile-time | Unknown/Multiple Test Case: | Difficulty: Blocking: | Unknown | Blocked By: | Related Tickets: -------------------------------------------------+------------------------- Changes (by rwbarton): * cc: rwbarton@… (added) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5610#comment:17> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7056: GHCi loadArchive "libiconv.a":failed Unknown PEi386 section name `.drectve'
by GHC 05 Sep '13

05 Sep '13

#7056: GHCi loadArchive "libiconv.a":failed Unknown PEi386 section name `.drectve' ----------------------------+---------------------------------------------- Reporter: songpp | Owner: thoughtpolice Type: bug | Status: new Priority: highest | Milestone: 7.8.1 Component: GHCi | Version: 7.4.1 Resolution: | Keywords: loadArchive Unknown PEi386 Operating System: Windows | Architecture: x86 Type of failure: GHCi | Difficulty: Unknown crash | Blocked By: 3658 Test Case: | Related Tickets: #2487, #7103, #7889 Blocking: | ----------------------------+---------------------------------------------- Comment (by Edward Z. Yang <ezyang@…>): In [changeset:24b791f9618e263d0a972be0ea4883d8f582d0fe/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="24b791f9618e263d0a972be0ea4883d8f582d0fe" Ignore drectve sections, partially fixing #7056 Signed-off-by: Edward Z. Yang <ezyang(a)mit.edu> }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7056#comment:18> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8225: Type Nats cause crash if GHC.TypeLits not imported
by GHC 05 Sep '13

05 Sep '13

#8225: Type Nats cause crash if GHC.TypeLits not imported ----------------------------------+------------------------------- Reporter: MikeIzbicki | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: GHCi crash Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+------------------------------- If I create a file "test.hs" with the following code: {{{ data Poly (a::a) x = undefined :: Poly 1 }}} when I load it into ghci, I get the error message: {{{ ghc: panic! (the 'impossible' happened) (GHC version 7.6.3 for x86_64-unknown-linux): lookupVers2 <<details unavailable>> Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} Now, modify the file into {{{ import GHC.TypeLits data Poly (a::a) x = undefined :: Poly 1 }}} and no error is reported. What's weird is that if we now modify the file back to the original, then the error is still not reported. Everything compiles perfectly fine. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8225> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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Re: [GHC] #7724: cross-compile to iOS
by GHC 05 Sep '13

05 Sep '13

#7724: cross-compile to iOS -------------------------------------+------------------------------------- Reporter: | Owner: StephenBlackheath | Status: closed Type: feature request | Milestone: 7.8.1 Priority: normal | Version: 7.7 Component: Compiler | Keywords: Resolution: fixed | Architecture: arm Operating System: Other | Difficulty: Unknown Type of failure: None/Unknown | Blocked By: 7700, 7705, 7707, Test Case: | 7709, 7718, 7720, 7721, 7722, 7733, Blocking: | 7759, 7760, 7761, 8125, 8126, 8127, | 8152, 8208, 8217 | Related Tickets: -------------------------------------+------------------------------------- Changes (by thoughtpolice): * status: new => closed * resolution: => fixed * blockedby: 7700, 7705, 7707, 7709, 7718, 7720, 7721, 7722, 7723, 7733, 7759, 7760, 7761, 8125, 8126, 8127, 8152, 8208, 8217 => 7700, 7705, 7707, 7709, 7718, 7720, 7721, 7722, 7733, 7759, 7760, 7761, 8125, 8126, 8127, 8152, 8208, 8217 Comment: All the patches are in place, so this is finally finished. Thanks everyone! :) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7724#comment:15> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8208: iOS patch: Fix linker warnings
by GHC 05 Sep '13

05 Sep '13

#8208: iOS patch: Fix linker warnings -------------------------------------+------------------------------------- Reporter: lukexi | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Keywords: | Operating System: Other Architecture: arm | Type of failure: Incorrect Difficulty: Easy (less than 1 | warning at compile-time hour) | Test Case: Blocked By: | Blocking: 7724 Related Tickets: | -------------------------------------+------------------------------------- This (very small) patch generalizes some fixes already used on OS X to silence some harmless warnings from ld, and fixes a spurious "Couldn't figure out linker information!" warning. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8208> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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