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| author | Leif Metcalf <me@leif.nz> | 2019-10-26 09:31:51 +1300 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2019-11-04 03:41:09 -0500 |
| commit | 5d4f16eed151caddf4624ff0a1fc23d5a4475957 (patch) | |
| tree | 004f0afd297945c1134a825e2dc5fd09f9d39453 /docs/users_guide/using-optimisation.rst | |
| parent | 3b65655c4cef5407829ed41707c48be2f8b3b340 (diff) | |
| download | haskell-5d4f16eed151caddf4624ff0a1fc23d5a4475957.tar.gz | |
Rephrase note on full-laziness
Diffstat (limited to 'docs/users_guide/using-optimisation.rst')
| -rw-r--r-- | docs/users_guide/using-optimisation.rst | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/docs/users_guide/using-optimisation.rst b/docs/users_guide/using-optimisation.rst index a8fd5e2d39..758bae39e0 100644 --- a/docs/users_guide/using-optimisation.rst +++ b/docs/users_guide/using-optimisation.rst @@ -459,13 +459,12 @@ by saying ``-fno-wombat``. residency. .. note:: - GHC doesn't implement complete full-laziness. When - optimisation in on, and ``-fno-full-laziness`` is not given, some - transformations that increase sharing are performed, such as - extracting repeated computations from a loop. These are the same - transformations that a fully lazy implementation would do, the - difference is that GHC doesn't consistently apply full-laziness, so - don't rely on it. + GHC doesn't implement complete full laziness. Although GHC's + full-laziness optimisation does enable some transformations + which would be performed by a fully lazy implementation (such as + extracting repeated computations from loops), these + transformations are not applied consistently, so don't rely on + them. .. ghc-flag:: -ffun-to-thunk :shortdesc: Allow worker-wrapper to convert a function closure into a thunk |