[commit: ghc] master: Minor twiddle to -funbox-strict-primitive-fields docs (7bf6eb9)
Johan Tibell <[email protected]>
| Newsgroups | gmane.comp.lang.haskell.cvs.ghc |
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Repository : ssh://darcs.haskell.org//srv/darcs/ghc On branch : master http://hackage.haskell.org/trac/ghc/changeset/7bf6eb9a86c160a54ea3df553ade040d5c37c627 >--------------------------------------------------------------- commit 7bf6eb9a86c160a54ea3df553ade040d5c37c627 Author: Johan Tibell <[email protected]> Date: Fri Dec 7 11:56:51 2012 -0800 Minor twiddle to -funbox-strict-primitive-fields docs >--------------------------------------------------------------- docs/users_guide/using.xml | 13 ++++++++++--- 1 files changed, 10 insertions(+), 3 deletions(-) diff --git a/docs/users_guide/using.xml b/docs/users_guide/using.xml index fb1a7cc..918176f 100644 --- a/docs/users_guide/using.xml +++ b/docs/users_guide/using.xml @@ -1871,9 +1871,9 @@ f "2" = 2 <para>This option causes all constructor fields which are marked strict (i.e. “!”) and which representation is smaller or equal to the size of a pointer to be unpacked if possible. It is - equivalent to adding an <literal>UNPACK</literal> pragma to every - strict constructor field that fullfills the size restriction. (see - <xref linkend="unpack-pragma"/>). + equivalent to adding an <literal>UNPACK</literal> pragma (see <xref + linkend="unpack-pragma"/>) to every strict constructor field that + fullfills the size restriction. </para> <para>This option is less of a sledgehammer than @@ -1882,6 +1882,13 @@ f "2" = 2 to turn on unboxing by default you can disable it for certain constructor fields using the <literal>NOUNPACK</literal> pragma (see <xref linkend="nounpack-pragma"/>).</para> + + <para> + Note that for consistency <literal>Double</literal>, + <literal>Word64</literal>, and <literal>Int64</literal> constructor + fields are unpacked on 32-bit platforms, even though they are + technically larger than a pointer on those platforms. + </para> </listitem> </varlistentry>