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Diffstat (limited to 'docs/users_guide/using-optimisation.rst')
| -rw-r--r-- | docs/users_guide/using-optimisation.rst | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/docs/users_guide/using-optimisation.rst b/docs/users_guide/using-optimisation.rst index d3ca68a1df..df87fdb6a3 100644 --- a/docs/users_guide/using-optimisation.rst +++ b/docs/users_guide/using-optimisation.rst @@ -262,8 +262,10 @@ by saying ``-fno-wombat``. of a unconditionally jump, we replace all jumps to A by jumps to the successor of A. - This is mostly done during Cmm passes. However this can miss corner cases. So at -O2 - we run the pass again at the asm stage to catch these. + This is mostly done during Cmm passes. However this can miss corner cases. + So at ``-O2`` this flag runs the pass again at the assembly stage to catch + these. Note that due to platform limitations (:ghc-ticket:`21972`) this flag + does nothing on macOS. .. ghc-flag:: -fblock-layout-cfg :shortdesc: Use the new cfg based block layout algorithm. |