| Commit message (Collapse) | Author | Age | Files | Lines |
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The main payload of this patch is to extend CPR so that it
detects when a function always returns a result constructed
with the *same* constructor, even if the constructor comes from
a sum type. This doesn't matter very often, but it does improve
some things (results below).
Binary sizes increase a little bit, I think because there are more
wrappers. This with -split-objs. Without split-ojbs binary sizes
increased by 6% even for HelloWorld.hs. It's hard to see exactly why,
but I think it was because System.Posix.Types.o got included in the
linked binary, whereas it didn't before.
Program Size Allocs Runtime Elapsed TotalMem
fluid +1.8% -0.3% 0.01 0.01 +0.0%
tak +2.2% -0.2% 0.02 0.02 +0.0%
ansi +1.7% -0.3% 0.00 0.00 +0.0%
cacheprof +1.6% -0.3% +0.6% +0.5% +1.4%
parstof +1.4% -4.4% 0.00 0.00 +0.0%
reptile +2.0% +0.3% 0.02 0.02 +0.0%
----------------------------------------------------------------------
Min +1.1% -4.4% -4.7% -4.7% -15.0%
Max +2.3% +0.3% +8.3% +9.4% +50.0%
Geometric Mean +1.9% -0.1% +0.6% +0.7% +0.3%
Other things in this commit
~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Got rid of the Lattice class in Demand
* Refactored the way that products and newtypes are
decomposed (no change in functionality)
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By using Haskell's debugIsOn rather than CPP's "#ifdef DEBUG", we
don't need to kludge things to keep the warning checker happy etc.
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This allows us to import values (i.e. non-functions) with the CAPI.
This means we can access values even if (on some or all platforms)
they are simple #defines.
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We only use it for "compiler" sources, i.e. not for libraries.
Many modules have a -fno-warn-tabs kludge for now.
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You can now use type functions in FFI types.
Newtypes are now only looked through if the constructor is in scope.
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Basically as documented in http://hackage.haskell.org/trac/ghc/wiki/KindFact,
this patch adds a new kind Constraint such that:
Show :: * -> Constraint
(?x::Int) :: Constraint
(Int ~ a) :: Constraint
And you can write *any* type with kind Constraint to the left of (=>):
even if that type is a type synonym, type variable, indexed type or so on.
The following (somewhat related) changes are also made:
1. We now box equality evidence. This is required because we want
to give (Int ~ a) the *lifted* kind Constraint
2. For similar reasons, implicit parameters can now only be of
a lifted kind. (?x::Int#) => ty is now ruled out
3. Implicit parameter constraints are now allowed in superclasses
and instance contexts (this just falls out as OK with the new
constraint solver)
Internally the following major changes were made:
1. There is now no PredTy in the Type data type. Instead
GHC checks the kind of a type to figure out if it is a predicate
2. There is now no AClass TyThing: we represent classes as TyThings
just as a ATyCon (classes had TyCons anyway)
3. What used to be (~) is now pretty-printed as (~#). The box
constructor EqBox :: (a ~# b) -> (a ~ b)
4. The type LCoercion is used internally in the constraint solver
and type checker to represent coercions with free variables
of type (a ~ b) rather than (a ~# b)
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These turn out to be a useful special case of splitTyConApp_maybe.
A refactoring only; no change in behaviour
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See the paper "Practical aspects of evidence based compilation in System FC"
* Coercion becomes a data type, distinct from Type
* Coercions become value-level things, rather than type-level things,
(although the value is zero bits wide, like the State token)
A consequence is that a coerion abstraction increases the arity by 1
(just like a dictionary abstraction)
* There is a new constructor in CoreExpr, namely Coercion, to inject
coercions into terms
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It still lives in darcs, if anyone wants to revive it sometime.
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This patch does a lot of tidying up of the way that dead variables are
handled in Core. Just the sort of thing to do on an aeroplane.
* The tricky "binder-swap" optimisation is moved from the Simplifier
to the Occurrence Analyser. See Note [Binder swap] in OccurAnal.
This is really a nice change. It should reduce the number of
simplifier iteratoins (slightly perhaps). And it means that
we can be much less pessimistic about zapping occurrence info
on binders in a case expression.
* For example:
case x of y { (a,b) -> e }
Previously, each time around, even if y,a,b were all dead, the
Simplifier would pessimistically zap their OccInfo, so that we
can't see they are dead any more. As a result virtually no
case expression ended up with dead binders. This wasn't Bad
in itself, but it always felt wrong.
* I added a check to CoreLint to check that a dead binder really
isn't used. That showed up a couple of bugs in CSE. (Only in
this sense -- they didn't really matter.)
* I've changed the PprCore printer to print "_" for a dead variable.
(Use -dppr-debug to see it again.) This reduces clutter quite a
bit, and of course it's much more useful with the above change.
* Another benefit of the binder-swap change is that I could get rid of
the Simplifier hack (working, but hacky) in which the InScopeSet was
used to map a variable to a *different* variable. That allowed me
to remove VarEnv.modifyInScopeSet, and to simplify lookupInScopeSet
so that it doesn't look for a fixpoint. This fixes no bugs, but
is a useful cleanup.
* Roman pointed out that Id.mkWildId is jolly dangerous, because
of its fixed unique. So I've
- localied it to MkCore, where it is private (not exported)
- renamed it to 'mkWildBinder' to stress that you should only
use it at binding sites, unless you really know what you are
doing
- provided a function MkCore.mkWildCase that emodies the most
common use of mkWildId, and use that elsewhere
So things are much better
* A knock-on change is that I found a common pattern of localising
a potentially global Id, and made a function for it: Id.localiseId
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Older GHCs can't parse OPTIONS_GHC.
This also changes the URL referenced for the -w options from
WorkingConventions#Warnings to CodingStyle#Warnings for the compiler
modules.
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I've forgotten the precise details already, but this patch
significantly refactors the way newtypes are handled, fixes
the foreign-export problem Trac #736 (which concerned newtypes),
and gets rid of a bogus unsafeCoerce in the foreign export
desugaring.
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This patch is a start on removing import lists and generally tidying
up the top of each module. In addition to removing import lists:
- Change DATA.IOREF -> Data.IORef etc.
- Change List -> Data.List etc.
- Remove $Id$
- Update copyrights
- Re-order imports to put non-GHC imports last
- Remove some unused and duplicate imports
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Mon Sep 18 17:19:19 EDT 2006 Manuel M T Chakravarty <chak@cse.unsw.edu.au>
* Flip direction of newtype coercions, fix some comments
Sun Aug 6 20:56:23 EDT 2006 Manuel M T Chakravarty <chak@cse.unsw.edu.au>
* Flip direction of newtype coercions, fix some comments
Thu Aug 3 10:53:37 EDT 2006 kevind@bu.edu
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non-vanilla
Mon Sep 18 14:51:33 EDT 2006 Manuel M T Chakravarty <chak@cse.unsw.edu.au>
* fix some coercion kind representation things, extend exprIsConApp_maybe to non-vanilla
Sat Aug 5 21:48:21 EDT 2006 Manuel M T Chakravarty <chak@cse.unsw.edu.au>
* fix some coercion kind representation things, extend exprIsConApp_maybe to non-vanilla
Wed Jul 19 08:06:28 EDT 2006 kevind@bu.edu
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Broken up massive patch -=chak
Original log message:
This is (sadly) all done in one patch to avoid Darcs bugs.
It's not complete work... more FC stuff to come. A compiler
using just this patch will fail dismally.
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For a long time GHC has had some internal mechanism designed to support
a call-site inline directive, thus
inline f xs
makes f be inlined at the call site even if f is big.
However, the surface syntax seems to have gone, and in any case it
can be done more neatly using a RULE.
This commit:
* Removes the InlineCall constructor for Note
and InlinePlease for SimplCont
* Adds a new known-key Id called 'inline', whose definition in
GHC.Base is just the identity function
* Adds a built-in RULE in PrelRules that rewrites (inline f) to
the body of f, if possible
* Adds documentation
NOTE: I have not tested this (aeroplane work). Give it a try!
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Up to now, the silent unwrapping of newtypes in foreign import/export
has been limited to data values. But it's useful for the IO monad
itself:
newtype MyIO a = MIO (IO a)
foreign import foo :: Int -> MyIO Int
This patch allows the IO monad to be
wrapped too. This applies to foreign import "dynamic" and "wrapper",
thus
foreign import "wrapper" foo :: MyIO () -> HisIO (FunPtr (MyIO ()))
Warning: I did on the plane, and I'm no longer sure if its 100%
complete, so needs more testing. In particular the wrapper/dynamic bit.
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Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.
The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level. The build system now makes no
pretense at being multi-project, it is just the GHC build system.
No doubt this will break many things, and there will be a period of
instability while we fix the dependencies. A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.
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