1. 27 Apr, 2018 4 commits
  2. 26 Apr, 2018 1 commit
    • Simon Peyton Jones's avatar
      Do not unpack class dictionaries with INLINABLE · 3d38e828
      Simon Peyton Jones authored
      Matthew Pickering uncovered a bad performance hole in the way
      that single-method dictionaries work, described in Trac #14955.
      See Note [Do not unpack class dictionaries] in WwLib.
      I tried to fix this 6 years ago, but got it slightly wrong.  This patch
      fixes it, which makes a dramatic improvement in the test case.
      Nofib highlights: not much happening:
        Program           Size    Allocs   Runtime   Elapsed  TotalMem
            VSM          -0.3%     +2.7%     -7.4%     -7.4%      0.0%
      cacheprof          -0.0%     +0.1%     +0.3%     +0.7%      0.0%
        integer          -0.0%     +1.1%     +7.5%     +7.5%      0.0%
            tak          -0.1%     -0.2%     0.024     0.024      0.0%
            Min          -4.4%     -0.2%     -7.4%     -7.4%     -8.0%
            Max          +0.6%     +2.7%     +7.5%     +7.5%      0.0%
      Geom Mean          -0.1%     +0.0%     +0.1%     +0.1%     -0.2%
      I investigated VSM.  The patch unpacks class dictionaries a bit more
      than before (i.e. does so if there is no INLINABLE pragma). And that
      gives better code in VSM (less dictionary selection etc), but one closure
      gets one word bigger.
      I'll accept these changes in exchange for more robust performance.
      Some ghci.debugger output wobbled around (order of bindings
      being displayed). I have no idea why; but I accepted the changes.
  3. 25 Apr, 2018 2 commits
    • Andrey Mokhov's avatar
      Update Hadrian submodule · 625eea93
      Andrey Mokhov authored
        * Link to Quick Start guide
        * Update README.md (hadrian/578)
        * Fix AppVeyor (hadrian/577)
        * Fix CircleCI
        * Generic library rules (hadrian/571)
        * Fix lint error (hadrian/575)
        * Fix missing libHSghc-8.5-0.a (hadrian/574)
        * Fix the path to touchy (hadrian/572)
        * Fix integer-gmp build (hadrian/568)
        * Undo fs*.h workaround
        * Fix copying of fs*.h files during RTS registration (hadrian/566)
        * Fix Windows build, improve error reporting (hadrian/565)
        * Fix Windows build (hadrian/563)
        * Fix boot and configure on AppVeyor (hadrian/561)
        * Preliminary bindist (hadrian/558, hadrian/555)
        * Unregister stage0 package first if it needs to be
          cloned (hadrian/552)
        * Fix Circle CI (hadrian/553)
        * Fix warnings (hadrian/547)
        * Merge pull request hadrian/542 from Mistuke/fix-specific-file
        * Use Cabal directly in place of ghc-cabal + make build root
          configurable (hadrian/531)
        * Add user-defined flavour example for turning off dynamic
          linking (hadrian/535)
        * Add clean routines for fs (hadrian/533)
        * Add 'git' to nativeBuildInputs in shell.nix (hadrian/530)
        * Add extra include paths when invoking ghc-cabal (hadrian/526)
        * Merge pull request hadrian/528 from snowleopard/bump-cabal
        * Merge pull request hadrian/521 from snowleopard/drop-chmod
        * Change permission bits for build.cabal.sh,
          fixes hadrian/517 (hadrian/520)
        * Pin nixpkgs and all-cabal-hashes in shell.nix (hadrian/511)
        * Add troubleshooting section
    • Ömer Sinan Ağacan's avatar
      Stable.c: minor refactoring, add/update some comments · acb73617
      Ömer Sinan Ağacan authored
      Test Plan: Passes validate
      Reviewers: simonmar, bgamari, erikd
      Subscribers: thomie, carter
      GHC Trac Issues: #10296
      Differential Revision: https://phabricator.haskell.org/D4627
  4. 24 Apr, 2018 3 commits
  5. 23 Apr, 2018 3 commits
  6. 22 Apr, 2018 1 commit
  7. 21 Apr, 2018 3 commits
  8. 20 Apr, 2018 10 commits
    • Tobias Dammers's avatar
      Remove unnecessary check in simplCast · 2a5bdd9a
      Tobias Dammers authored
      The coercion optimizer will take care of it anyway, and the check is
      prohibitively expensive.
      See Trac #14737.
      Reviewers: bgamari
      Subscribers: simonpj, thomie, carter
      Differential Revision: https://phabricator.haskell.org/D4568
    • Ben Gamari's avatar
      base: Add a test for T10412 · da743852
      Ben Gamari authored
      Expects the current behavior, will be updated by D4593 to reflect
      desired behavior.
      Reviewers: hvr
      Subscribers: thomie, carter
      GHC Trac Issues: #10412
      Differential Revision: https://phabricator.haskell.org/D4610
    • Matthew Pickering's avatar
      Fix implementation of rnIfaceBndr · 698db813
      Matthew Pickering authored
      Reviewers: ezyang, bgamari
      Reviewed By: bgamari
      Subscribers: thomie, carter
      GHC Trac Issues: #15041
      Differential Revision: https://phabricator.haskell.org/D4600
    • Matthew Pickering's avatar
      Remove broken top-level shell.nix · 430e6fed
      Matthew Pickering authored
      There is a maintained shell.nix file in the hadrian submodule. This
      has long since been broken anyway.
      Reviewers: bgamari
      Reviewed By: bgamari
      Subscribers: thomie, carter
      GHC Trac Issues: #15045
      Differential Revision: https://phabricator.haskell.org/D4599
    • Simon Peyton Jones's avatar
      comments only · f6db0b20
      Simon Peyton Jones authored
    • Simon Peyton Jones's avatar
      Inline wrappers earlier · 8b10b896
      Simon Peyton Jones authored
      This patch has a single significant change:
        strictness wrapper functions are inlined earlier,
        in phase 2 rather than phase 0.
      As shown by Trac #15056, this gives a better chance for RULEs to fire.
      Before this change, a function that would have inlined early without
      strictness analyss was instead inlining late. Result: applying
      "optimisation" made the program worse.
      This does not make too much difference in nofib, but I've stumbled
      over the problem more than once, so even a "no-change" result would be
      quite acceptable.  Here are the headlines:
              Program           Size    Allocs   Runtime   Elapsed  TotalMem
            cacheprof          -0.5%     -0.5%     +2.5%     +2.5%      0.0%
               fulsom          -1.0%     +2.6%     -0.1%     -0.1%      0.0%
                 mate          -0.6%     +2.4%     -0.9%     -0.9%      0.0%
              veritas          -0.7%    -23.2%     0.002     0.002      0.0%
                  Min          -1.4%    -23.2%    -12.5%    -15.3%      0.0%
                  Max          +0.6%     +2.6%     +4.4%     +4.3%    +19.0%
       Geometric Mean          -0.7%     -0.2%     -1.4%     -1.7%     +0.2%
      * A worthwhile reduction in binary size.
      * Runtimes are not to be trusted much but look as if they
        are moving the right way.
      * A really big win in veritas, described in comment:1 of
        Trac #15056; more fusion rules fired.
      * I investigated the losses in 'mate' and 'fulsom'; see #15056.
    • Tobias Dammers's avatar
      Caching coercion roles in NthCo and coercionKindsRole refactoring · 2fbe0b51
      Tobias Dammers authored
      While addressing nonlinear behavior related to coercion roles,
      particularly `NthCo`, we noticed that coercion roles are recalculated
      often even though they should be readily at hand already in most cases.
      This patch adds a `Role` to the `NthCo` constructor so that we can cache
      them rather than having to recalculate them on the fly.
      https://ghc.haskell.org/trac/ghc/ticket/11735#comment:23 explains the
      Performance improvement over GHC HEAD, when compiling Grammar.hs (see below):
      GHC 8.2.1:
      ghc Grammar.hs  176.27s user 0.23s system 99% cpu 2:56.81 total
      before patch (but with other optimizations applied):
      ghc Grammar.hs -fforce-recomp  175.77s user 0.19s system 100% cpu 2:55.78 total
      ../../ghc/inplace/bin/ghc-stage2 Grammar.hs  10.32s user 0.17s system 98% cpu 10.678 total
      Introduces the following regressions:
      - perf/compiler/parsing001 (possibly false positive)
      - perf/compiler/T9872
      - perf/compiler/haddock.base
      Reviewers: goldfire, bgamari, simonpj
      Reviewed By: simonpj
      Subscribers: rwbarton, thomie, carter
      GHC Trac Issues: #11735
      Differential Revision: https://phabricator.haskell.org/D4394
    • Ryan Scott's avatar
      Bump transformers submodule · b41a42e3
      Ryan Scott authored
      This brings in a commit which migrates Contravariant instances from
      base to transformers.
    • Azel's avatar
      Fixes isAlphaNum re. isAlpha/isNumber and doc fix (trac issue #10412) · a26983a3
      Azel authored
      Corrects the inconsistency between Data.Char.isAlphaNum,
      Data.Char.isAlpha and Data.Char.isNumber. Indeed, isAlphaNum was
      returning True not only when isAlpha or isNumber returned True but
      also when isMark did. The selectors for the Mn, Mc and Me general
      categories where removed from the macro generating u_iswalnum in
      Also, Data.Char.isAlphaNum's documentation was changed to state that
      isAlphaNum returns true not only for Unicode number digits but for
      Unicode numbers in general in Unicode.hs.
      Signed-off-by: Azel's avatarARJANEN Loïc Jean David <arjanen.loic@gmail.com>
      Reviewers: hvr, ekmett, lelf, bgamari
      Reviewed By: bgamari
      Subscribers: thomie, carter
      GHC Trac Issues: #10412
      Differential Revision: https://phabricator.haskell.org/D4593
    • Ryan Scott's avatar
      Lint types in newFamInst · 257c13d8
      Ryan Scott authored
      We weren't linting the types used in `newFamInst`, which
      might have been why #15012 went undiscovered for so long. Let's fix
      One has to be surprisingly careful with expanding type synonyms in
      `lintType`, since in the offending program (simplified):
      type FakeOut a = Int
      type family TF a
      type instance TF Int = FakeOut a
      If one expands type synonyms, then `FakeOut a` will expand to
      `Int`, which masks the issue (that `a` is unbound). I added an
      extra Lint flag to configure whether type synonyms should be
      expanded or not in Lint, and disabled this when calling `lintTypes`
      from `newFamInst`.
      As evidence that this works, I ran it on the offending program
      from #15012, and voilà:
      $ ghc3/inplace/bin/ghc-stage2 Bug.hs -dcore-lint
      [1 of 1] Compiling Foo              ( Bug.hs, Bug.o )
      ghc-stage2: panic! (the 'impossible' happened)
        (GHC version 8.5.20180417 for x86_64-unknown-linux):
              Core Lint error
        <no location info>: warning:
            In the type ‘... (Rec0 (FakeOut b_a1Qt))))’
            @ b_a1Qt is out of scope
      Test Plan: make test TEST=T15057
      Reviewers: simonpj, goldfire, bgamari
      Reviewed By: bgamari
      Subscribers: thomie, carter
      GHC Trac Issues: #15057
      Differential Revision: https://phabricator.haskell.org/D4611
  9. 19 Apr, 2018 13 commits
    • Ben Gamari's avatar
      boot: Fix computation of TOP · 8fa688a8
      Ben Gamari authored
      Test Plan: Run `./boot`, check to make sure that
      `libraries/ghc-prim/GNUmakefile` is sane
      Subscribers: thomie, carter, sjakobi
      Differential Revision: https://phabricator.haskell.org/D4580
    • Ben Gamari's avatar
      configure: Use -Werror to check for existence of -no-pie · cbd73bbb
      Ben Gamari authored
      Clang throws a warning instead of an error when it is passed -no-pie,
          clang: warning: argument unused during compilation: '-nopie'
      Consequently configure concludes that it supports -no-pie. However, this
      will fail when used with -Werror. The solution is to simply use -Werror
      in the configure check.
      Thanks to @goldfire for reporting this.
      Reviewers: hvr
      Subscribers: thomie, carter, goldfire
      Differential Revision: https://phabricator.haskell.org/D4557
    • Ben Gamari's avatar
      parsec: Make version hack compatible with Windows · 3c3e7310
      Ben Gamari authored
      Fixes D4609 on Windows by bumping parsec submodule.
    • Alp Mestanogullari's avatar
      testsuite: Fix `./validate --slow` · d9d80151
      Alp Mestanogullari authored
      This fixes all unexpected passes and unexpected failures from a
      `./validate --slow` run I did last week. I commented on many
      tickets and created a few more as I was going through the failing
      tests. A summary of the entire process is available at:
      This is part of an attempt to have `./validate --slow` pass,
      tracked in #14890. Another patch will be necessary for the unexpected
      stats failures.
      Test Plan: ./validate --slow (not green yet)
      Reviewers: bgamari, simonmar
      Subscribers: thomie, carter
      Differential Revision: https://phabricator.haskell.org/D4546
    • Ryan Scott's avatar
      Bump base to version · 8f19ecc9
      Ryan Scott authored
      Summary: Bumps several submodules.
      Test Plan: ./validate
      Reviewers: hvr, bgamari
      Reviewed By: bgamari
      Subscribers: thomie, carter
      GHC Trac Issues: #15018
      Differential Revision: https://phabricator.haskell.org/D4609
    • Ryan Scott's avatar
      Fix #15012 with a well-placed use of Any · b08a6d75
      Ryan Scott authored
      Previously, derived `Generic1` instances could have associated `Rep1`
      type family instances with unbound variables, such as in the following
      data T a = MkT (FakeOut a) deriving Generic1
      type FakeOut a = Int
      instance Generic1 T where
        type Rep1 T = ... (Rec0 (FakeOut a))
      Yikes! To avoid this, we simply map the last type variable in a
      derived `Generic1` instance to `Any`.
      Test Plan: make test TEST=T15012
      Reviewers: bgamari
      Reviewed By: bgamari
      Subscribers: simonpj, thomie, carter
      GHC Trac Issues: #15012
      Differential Revision: https://phabricator.haskell.org/D4602
    • Tao He's avatar
      Better error message for empty character literal, for Trac #13450. · cac8be61
      Tao He authored
      For empty character literal, the `''`, report error message properly
      rather than just throw a "parser error" with wrong error location.
      Test Plan: make test TEST="T13450 T13450TH"
      Reviewers: goldfire, bgamari
      Reviewed By: bgamari
      Subscribers: thomie, mpickering, carter
      GHC Trac Issues: #13450
      Differential Revision: https://phabricator.haskell.org/D4594
    • Ömer Sinan Ağacan's avatar
      Add a test for #14815: · f7f567d5
      Ömer Sinan Ağacan authored
      Because the program doesn't have any binders that -XStrict can make
      strict, the desugarer output should be identical when it's compiled with
      and without -XStrict. This wasn't the case with GHC 8.2.2, but
      apparently it was fixed some time between 8.2.2 and 8.4.1. We now add a
      test case to make sure it stays fixed.
      Reviewers: bgamari
      Reviewed By: bgamari
      Subscribers: simonpj, rwbarton, thomie, carter
      GHC Trac Issues: #14815
      Differential Revision: https://phabricator.haskell.org/D4531
    • Sergei Trofimovich's avatar
      rts: fix format arguments for debugBelch calls on 32-bit systems · 48b88421
      Sergei Trofimovich authored
      This change fixes build failure like this:
        rts/Stats.c:1467:14: error:
           error: format '%u' expects argument of type 'unsigned int',
               but argument 4 has type 'long unsigned int' [-Werror=format=]
             debugBelch("%51s%9" FMT_Word " %9" FMT_Word "\n",
      The fix is to cast sizeof() result to Word (W_).
      Signed-off-by: default avatarSergei Trofimovich <slyfox@gentoo.org>
      Test Plan: build for 32-bit target
      Reviewers: bgamari, erikd, simonmar
      Reviewed By: simonmar
      Subscribers: thomie, carter
      Differential Revision: https://phabricator.haskell.org/D4608
    • Ben Gamari's avatar
      users-guide: Override mathjax_path · 803178a5
      Ben Gamari authored
      The Mathjax CDN no longer exists. Use CDNJS instead.
      See #15006.
      Test Plan: Build HTML users guide, see whether math is rendered.
      Reviewers: alpmestan
      Reviewed By: alpmestan
      Subscribers: thomie, carter
      GHC Trac Issues: #15006
      Differential Revision: https://phabricator.haskell.org/D4603
    • Ben Gamari's avatar
      Add a test case from the nested CPR work · 19ddd044
      Ben Gamari authored
      Reviewers: bgamari
      Reviewed By: bgamari
      Subscribers: thomie, carter
      Differential Revision: https://phabricator.haskell.org/D4565
    • Ryan Scott's avatar
      Bump unix submodule to version · 2fdfe056
      Ryan Scott authored
      Summary: Requires bumping several submodules.
      Test Plan: ./validate
      Reviewers: hvr, bgamari
      Subscribers: thomie, carter
      GHC Trac Issues: #15042
      Differential Revision: https://phabricator.haskell.org/D4604
    • Ryan Scott's avatar
      Fix #14710 with more validity checks during renaming · 447d1264
      Ryan Scott authored
      #14710 revealed two unfortunate regressions related to kind
      polymorphism that had crept in in recent GHC releases:
      1. While GHC was able to catch illegal uses of kind polymorphism
         (i.e., if `PolyKinds` wasn't enabled) in limited situations, it
         wasn't able to catch kind polymorphism of the following form:
      f :: forall a. a -> a
      f x = const x g
          g :: Proxy (x :: a)
          g = Proxy
      Note that the variable `a` is being used as a kind variable in the
      type signature of `g`, but GHC happily accepts it, even without
      the use of `PolyKinds`.
      2. If you have `PolyKinds` (but not `TypeInType`) enabled, then GHC
         incorrectly accepts the following definition:
      f :: forall k (a :: k). Proxy a
      f = Proxy
      Even though `k` is explicitly bound and then later used as a kind
      variable within the same telescope.
      This patch fixes these two bugs as follows:
      1. Whenever we rename any `HsTyVar`, we check if the following three
         criteria are met:
         (a) It's a type variable
         (b) It's used at the kind level
         (c) `PolyKinds` is not enabled
         If so, then we have found an illegal use of kind polymorphism, so
         throw an error.
         This check replaces the `checkBadKindBndrs` function, which could
         only catch illegal uses of kind polymorphism in very limited
         situations (when the bad kind variable happened to be implicitly
         quantified in the same type signature).
      2. In `extract_hs_tv_bndrs`, we must error if `TypeInType` is not
         enabled and either of the following criteria are met:
         (a) An explicitly bound type variable is used in kind position
             in the body of a `forall` type.
         (b) An explicitly bound type variable is used in kind position
             in the kind of a bound type variable in a `forall` type.
         `extract_hs_tv_bndrs` was checking (a), but not (b). Easily fixed.
      Test Plan: ./validate
      Reviewers: goldfire, simonpj, bgamari, hvr
      Reviewed By: simonpj
      Subscribers: thomie, carter
      GHC Trac Issues: #14710
      Differential Revision: https://phabricator.haskell.org/D4554