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| author | Joachim Breitner <mail@joachim-breitner.de> | 2016-03-30 16:09:36 +0200 |
|---|---|---|
| committer | Joachim Breitner <mail@joachim-breitner.de> | 2016-03-30 18:07:12 +0200 |
| commit | 3d245bf5255ebfb72813596fa93b9051f7518321 (patch) | |
| tree | caef6b33ffa4e532dd8e0b90075be00898fceaa7 /docs | |
| parent | 1757dd8ebed0732018319e43e6468b868a6aceeb (diff) | |
| download | haskell-3d245bf5255ebfb72813596fa93b9051f7518321.tar.gz | |
Do not claim that -O2 does not do better than -O
when in fact it does. This was pointed out by Johannes Bechberger and
supported with seemingly statistically sound evidence in his Bachelor
thesis: Of the benchmark shootout programs, 80% benefit significantly by
switchtng from -O to -O2.
See https://uqudy.serpens.uberspace.de/blog/2016/02/08/ghc-performance-over-time/
for a few raw numbers.
Differential Revision: https://phabricator.haskell.org/D2065
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/users_guide/using-optimisation.rst | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/docs/users_guide/using-optimisation.rst b/docs/users_guide/using-optimisation.rst index bc8e70036e..5e4995d968 100644 --- a/docs/users_guide/using-optimisation.rst +++ b/docs/users_guide/using-optimisation.rst @@ -79,9 +79,6 @@ one reason to stick to no-optimisation when developing code. runtime or space *worse* if you're unlucky. They are normally turned on or off individually. - At the moment, ``-O2`` is *unlikely* to produce better code than - ``-O``. - .. ghc-flag:: -Odph .. index:: |