1. 14 Sep, 2000 5 commits
    • simonpj's avatar
      [project @ 2000-09-14 13:46:39 by simonpj] · cae34044
      simonpj authored
      ---------------------------------------
      	Simon's tuning changes: early Sept 2000
      	---------------------------------------
      
      Library changes
      ~~~~~~~~~~~~~~~
      * Eta expand PrelShow.showLitChar.  It's impossible to compile this well,
        and it makes a big difference to some programs (e.g. gen_regexps)
      
      * Make PrelList.concat into a good producer (in the foldr/build sense)
      
      
      Flag changes
      ~~~~~~~~~~~~
      * Add -ddump-hi-diffs to print out changes in interface files.  Useful
        when watching what the compiler is doing
      
      * Add -funfolding-update-in-place to enable the experimental optimisation
        that makes the inliner a bit keener to inline if it's in the RHS of
        a thunk that might be updated in place.  Sometimes this is a bad idea
        (one example is in spectral/sphere; see notes in nofib/Simon-nofib-notes)
      
      
      Tuning things
      ~~~~~~~~~~~~~
      * Fix a bug in SetLevels.lvlMFE.  (change ctxt_lvl to dest_level)
        I don't think this has any performance effect, but it saves making
        a redundant let-binding that is later eliminated.
      
      * Desugar.dsProgram and DsForeign
        Glom together all the bindings into a single Rec.  Previously the
        bindings generated by 'foreign' declarations were not glommed together, but
        this led to an infelicity (i.e. poorer code than necessary) in the modules
        that actually declare Float and Double (explained a bit more in Desugar.dsProgram)
      
      * OccurAnal.shortMeOut and IdInfo.shortableIdInfo
        Don't do the occurrence analyser's shorting out stuff for things which
        have rules.  Comments near IdInfo.shortableIdInfo.
        This is deeply boring, and mainly to do with making rules work well.
        Maybe rules should have phases attached too....
      
      * CprAnalyse.addIdCprInfo
        Be a bit more willing to add CPR information to thunks;
        in particular, if the strictness analyser has just discovered that this
        is a strict let, then the let-to-case transform will happen, and CPR is fine.
        This made a big difference to PrelBase.modInt, which had something like
      	modInt = \ x -> let r = ... -> I# v in
      			...body strict in r...
        r's RHS isn't a value yet; but modInt returns r in various branches, so
        if r doesn't have the CPR property then neither does modInt
      
      * MkId.mkDataConWrapId
        Arrange that vanilla constructors, like (:) and I#, get unfoldings that are
        just a simple variable $w:, $wI#.  This ensures they'll be inlined even into
        rules etc, which makes matching a bit more reliable.  The downside is that in
        situations like (map (:) xs), we'll end up with (map (\y ys. $w: y ys) xs.
        Which is tiresome but it doesn't happen much.
      
      * SaAbsInt.findStrictness
        Deal with the case where a thing with no arguments is bottom.  This is Good.
        E.g.   module M where { foo = error "help" }
        Suppose we have in another module
      	case M.foo of ...
        Then we'd like to do the case-of-error transform, without inlining foo.
      
      
      Tidying up things
      ~~~~~~~~~~~~~~~~~
      * Reorganised Simplify.completeBinding (again).
      
      * Removed the is_bot field in CoreUnfolding (is_cheap is true if is_bot is!)
        This is just a tidy up
      
      * HsDecls and others
        Remove the NewCon constructor from ConDecl.  It just added code, and nothing else.
        And it led to a bug in MkIface, which though that a newtype decl was always changing!
      
      * IdInfo and many others
        Remove all vestiges of UpdateInfo (hasn't been used for years)
      cae34044
    • simonpj's avatar
      [project @ 2000-09-14 12:12:23 by simonpj] · 189333a4
      simonpj authored
      Improve the kind-inference test
      189333a4
    • simonmar's avatar
      [project @ 2000-09-14 09:58:00 by simonmar] · fd1e4701
      simonmar authored
      don't forget to bail out when "compilation IS NOT required"
      fd1e4701
    • simonmar's avatar
      [project @ 2000-09-14 09:10:35 by simonmar] · 670b00ee
      simonmar authored
      extend the scope of #ifdef GHCI so we can compile this with pre-4.08 compilers.
      670b00ee
    • simonpj's avatar
      [project @ 2000-09-14 08:17:54 by simonpj] · e1f4b5f4
      simonpj authored
      Fix bug in the driver that led to
      
      	Fail: system error
      	Action: getFileStatus
      
      It was due to Simon M's recent addition of modification-time
      checking.  You forgot to check whether the file M.o existed!
      e1f4b5f4
  2. 13 Sep, 2000 1 commit
  3. 12 Sep, 2000 3 commits
  4. 11 Sep, 2000 8 commits
    • rrt's avatar
      [project @ 2000-09-11 15:04:08 by rrt] · 1448475b
      rrt authored
      Implemented gettimeofday on Windows by calling GetTickCount(). This
      only seems to have a resolution of 1/100s, but that's just about OK
      for threadDelay, which only needs 50 ticks per second.
      1448475b
    • rrt's avatar
      [project @ 2000-09-11 15:02:51 by rrt] · fa29f53b
      rrt authored
      Pass --target to configure of GMP, so that building for mingwin under
      cygwin works properly.
      fa29f53b
    • rrt's avatar
      [project @ 2000-09-11 14:11:25 by rrt] · c5244374
      rrt authored
      Revised GHC installer size downwards.
      c5244374
    • rrt's avatar
      [project @ 2000-09-11 13:56:22 by rrt] · 20ff806f
      rrt authored
      Removed Windows FAQ about -static no longer being supported (it is).
      20ff806f
    • sewardj's avatar
      [project @ 2000-09-11 12:20:56 by sewardj] · 55945d0a
      sewardj authored
      First shot at a STG interpreter for GHCI.  Translates Stg syntax into a
      form convenient for interpretation, and can then run that.  Most of the
      translation stuff is there and works.  The interpreter framework is there
      and partly filled in, and seems to work.  There are still quite a lot of
      cases, etc, to fill in, but this should be straightforward given that
      the framework exists.  This interpreter cannot handle (yet?) unboxed
      tuples, but can deal with more or less everything else, including standard
      unboxed Int, Double, etc, code.
      55945d0a
    • sewardj's avatar
      [project @ 2000-09-11 11:17:09 by sewardj] · d4993e8b
      sewardj authored
      Initial primop support for the metacircular interpreter (GHCI).
      Only appears if you compile with -DGHCI; if not, the world is
      unchanged.
      
      new primops:
         indexPtrOffClosure#
         indexWordOffClosure#
      
      modified:
         dataToTag#   -- now dereferences indirections before extracting tag
      
      new entry code
         mci_constr_entry          and
         mci_constr[1..8]entry
      being the direct and vectored return code fragments for interpreter
      created constructors.  Support for static constructors is not yet
      done.
      
      New handwritten .hc functions:
         mci_make_constr*
      being code to create various flavours of constructors from args
      on the stack.  An interface file to describe these will follow in
      a later commit.
      d4993e8b
    • simonmar's avatar
      [project @ 2000-09-11 09:27:14 by simonmar] · 3fc55f79
      simonmar authored
      HP-PA fixes from Eric Schweitz <schweitz@nortelnetworks.com>
      3fc55f79
    • simonpj's avatar
      [project @ 2000-09-11 08:13:37 by simonpj] · d8e1c0a7
      simonpj authored
      Remove redundant setNoDiscardId call from Specialise.newIdSM
      d8e1c0a7
  5. 08 Sep, 2000 3 commits
  6. 07 Sep, 2000 14 commits
    • simonpj's avatar
      [project @ 2000-09-07 16:32:23 by simonpj] · 4e6d5798
      simonpj authored
      A list of simplifier-related stuff, triggered
      	by looking at GHC's performance.
      
      	I don't guarantee that this lot will lead to
      	a uniform improvement over 4.08, but it it should
      	be a bit better.  More work probably required.
      
      
      * Make the simplifier's Stop continuation record whether the expression being
        simplified is the RHS of a thunk, or (say) the body of a lambda or case RHS.
        In the thunk case we want to be a bit keener about inlining if the type of
        the thunk is amenable to update in place.
      
      * Fix interestingArg, which was being too liberal, and hence doing
        too much inlining.
      
      * Extended CoreUtils.exprIsCheap to make two more things cheap:
          - 	case (coerce x) of ...
          -   let x = y +# z
        This makes a bit more eta expansion happen.  It was provoked by
        a program of Marcin's.
      
      * MkIface.ifaceBinds.   Make sure that we emit rules for things
        (like class operations) that don't get a top-level binding in the
        interface file.  Previously such rules were silently forgotten.
      
      * Move transformRhs to *after* simplification, which makes it a
        little easier to do, and means that the arity it computes is
        readily available to completeBinding.  This gets much better
        arities.
      
      * Do coerce splitting in completeBinding. This gets good code for
      	newtype CInt = CInt Int
      
      	test:: CInt -> Int
      	test x = case x of
      	      	   1 -> 2
      	      	   2 -> 4
      	      	   3 -> 8
      	      	   4 -> 16
      	      	   _ -> 0
      
      * Modify the meaning of "arity" so that during compilation it means
        "if you apply this function to fewer args, it will do virtually
        no work".   So, for example
      	f = coerce t (\x -> e)
        has arity at least 1.  When a function is exported, it's arity becomes
        the number of exposed, top-level lambdas, which is subtly different.
        But that's ok.
      
        I removed CoreUtils.exprArity altogether: it looked only at the exposed
        lambdas.  Instead, we use exprEtaExpandArity exclusively.
      
        All of this makes I/O programs work much better.
      4e6d5798
    • simonpj's avatar
      [project @ 2000-09-07 16:31:45 by simonpj] · e9f0fa88
      simonpj authored
      * The simplifier used to glom together all the top-level bindings into
        a single Rec every time it was invoked.  The reason for this is explained
        in SimplCore.lhs, but for at least one simple program it meant that the
        simplifier never got around to unravelling the recursive group into
        non-recursive pieces.  So I've put the glomming under explicit flag
        control with a -fglom-binds simplifier pass.   A side benefit is
        that because it happens less often, the (expensive) SCC algorithm
        runs less often.
      e9f0fa88
    • simonpj's avatar
      [project @ 2000-09-07 16:29:36 by simonpj] · 0f70a20e
      simonpj authored
      Omit unnecessary import
      0f70a20e
    • simonpj's avatar
      [project @ 2000-09-07 16:28:44 by simonpj] · 2c7fe84e
      simonpj authored
      Do the begin-pass/end-pass stuff like the other core passes
      2c7fe84e
    • simonpj's avatar
      [project @ 2000-09-07 16:27:55 by simonpj] · 5439bab7
      simonpj authored
      Add comment
      5439bab7
    • simonpj's avatar
      [project @ 2000-09-07 16:25:32 by simonpj] · 17fff931
      simonpj authored
      Add an access function substEnvEnv
      17fff931
    • simonpj's avatar
      [project @ 2000-09-07 16:24:14 by simonpj] · cefef156
      simonpj authored
      Get the worker and wrapper in the right order
      cefef156
    • simonpj's avatar
      [project @ 2000-09-07 13:25:28 by simonpj] · 04a28507
      simonpj authored
      Primitives can return ThreadId# values
      04a28507
    • simonpj's avatar
      [project @ 2000-09-07 11:42:49 by simonpj] · c77080dd
      simonpj authored
      1) Fix a bad bug in Subst.lhs that made uniqAway go into an
         infinite loop when the 'hash code' in the in-scope set was
         zero.
      
      2) Rename BasicTypes.isFragileOccInfo to isFragileOcc
         Add isDeadOcc to BasisTypes
      
      
      (2) is just a tidy-up.  I have to commit it now because of (1), which
      is a bad bug.  I hope that I've committed all the files involved in (2).
      c77080dd
    • rrt's avatar
      [project @ 2000-09-07 11:23:59 by rrt] · 02086d37
      rrt authored
      Added support for building gmp.dll again.
      02086d37
    • rrt's avatar
      [project @ 2000-09-07 11:23:22 by rrt] · 0221fd81
      rrt authored
      Gave version of RedHat in DocBook note.
      0221fd81
    • rrt's avatar
      [project @ 2000-09-07 11:22:28 by rrt] · 3e27303f
      rrt authored
      Added note on how to fix RedHat 6.2 DocBook installation.
      3e27303f
    • simonpj's avatar
      [project @ 2000-09-07 10:14:52 by simonpj] · 1264eac2
      simonpj authored
      Improve -ddump-types
      1264eac2
    • simonpj's avatar
      [project @ 2000-09-07 09:10:07 by simonpj] · c1994342
      simonpj authored
      * Make the desugarer use string equality for string literal
        patterns longer than 1 character.  And put a specialised
        eqString into PrelBase, with a suitable specialisation rule.
        This makes a huge difference to the size of the code generated
        by deriving(Read) notably in Time.lhs
      c1994342
  7. 06 Sep, 2000 6 commits