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| author | Simon Peyton Jones <simonpj@microsoft.com> | 2013-01-24 14:50:50 +0000 |
|---|---|---|
| committer | Simon Peyton Jones <simonpj@microsoft.com> | 2013-01-24 14:50:50 +0000 |
| commit | d3b8991be3875302ca6d1a4ef6e72891e9567dd5 (patch) | |
| tree | afbf9416c2d569dba29fafdd7478aad02f4e0891 /compiler/specialise | |
| parent | b4e86fa8b7a3c7527632aa8ba4b4a94a8719bfa5 (diff) | |
| download | haskell-d3b8991be3875302ca6d1a4ef6e72891e9567dd5.tar.gz | |
Introduce CPR for sum types (Trac #5075)
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)
Diffstat (limited to 'compiler/specialise')
| -rw-r--r-- | compiler/specialise/SpecConstr.lhs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/specialise/SpecConstr.lhs b/compiler/specialise/SpecConstr.lhs index 3dc527475f..afc70f9b9e 100644 --- a/compiler/specialise/SpecConstr.lhs +++ b/compiler/specialise/SpecConstr.lhs @@ -1435,7 +1435,7 @@ calcSpecStrictness fn qvars pats go_one :: DmdEnv -> Demand -> CoreExpr -> DmdEnv go_one env d (Var v) = extendVarEnv_C bothDmd env v d go_one env d e - | Just ds <- splitProdDmd_maybe d + | Just ds <- splitProdDmd_maybe d -- NB: d does not have to be strict , (Var _, args) <- collectArgs e = go env ds args go_one env _ _ = env \end{code} |