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Diffstat (limited to 'docs/users_guide/using-optimisation.rst')
| -rw-r--r-- | docs/users_guide/using-optimisation.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/users_guide/using-optimisation.rst b/docs/users_guide/using-optimisation.rst index 3e660c19e9..1cad51bb1b 100644 --- a/docs/users_guide/using-optimisation.rst +++ b/docs/users_guide/using-optimisation.rst @@ -186,6 +186,14 @@ list. optimisation. Switching this off can be useful if you have some ``unsafePerformIO`` expressions that you don't want commoned-up. +.. ghc-flag:: -fstg-cse + + :default: on + + Enables the common-sub-expression elimination optimisation on the STG + intermediate language, where it is able to common up some subexpressions + that differ in their types, but not their represetation. + .. ghc-flag:: -fdicts-cheap A very experimental flag that makes dictionary-valued expressions |