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| author | Johan Tibell <johan.tibell@gmail.com> | 2012-12-07 11:56:51 -0800 |
|---|---|---|
| committer | Johan Tibell <johan.tibell@gmail.com> | 2012-12-07 13:47:54 -0800 |
| commit | 7bf6eb9a86c160a54ea3df553ade040d5c37c627 (patch) | |
| tree | a010ddcbf12d40ec62ef7b4513aeb228b36203be /docs | |
| parent | c1c2d849789fac798923364ea75316ee73fce101 (diff) | |
| download | haskell-7bf6eb9a86c160a54ea3df553ade040d5c37c627.tar.gz | |
Minor twiddle to -funbox-strict-primitive-fields docs
Diffstat (limited to 'docs')
| -rw-r--r-- | 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 fb1a7ccd0b..918176f418 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> |