[commit: ghc] master: Enable -funbox-small-strict-fields by default (ade1ae9)

[Johan Tibell]

Repository : http://darcs.haskell.org/ghc.git/

On branch  : master

https://github.com/ghc/ghc/commit/ade1ae97ed52c493ec415c1601dace39b64071dd

>---------------------------------------------------------------

commit ade1ae97ed52c493ec415c1601dace39b64071dd
Author: Johan Tibell <johan.tibell at gmail.com>
Date:   Fri Apr 26 11:14:01 2013 -0700

    Enable -funbox-small-strict-fields by default
    
    The flag shows no real impact on nofib benchmarks and GHC itself,
    which is expected given the small number of strict but not already
    unpacked fields in the source of these programs. However, the flag
    allows us to omit most of the UNPACK pragmas that are so common in
    source code today.

>---------------------------------------------------------------

 compiler/main/DynFlags.hs  |  1 +
 docs/users_guide/using.xml | 11 ++++++-----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/compiler/main/DynFlags.hs b/compiler/main/DynFlags.hs
index 33eae5a..905c0d8 100644
--- a/compiler/main/DynFlags.hs
+++ b/compiler/main/DynFlags.hs
@@ -2767,6 +2767,7 @@ optLevelFlags
     , ([1,2],   Opt_FullLaziness)
     , ([1,2],   Opt_Specialise)
     , ([1,2],   Opt_FloatIn)
+    , ([1,2],   Opt_UnboxSmallStrictFields)
 
     , ([2],     Opt_LiberateCase)
     , ([2],     Opt_SpecConstr)
diff --git a/docs/users_guide/using.xml b/docs/users_guide/using.xml
index be7e3da..9c6fbf7 100644
--- a/docs/users_guide/using.xml
+++ b/docs/users_guide/using.xml
@@ -1901,11 +1901,12 @@ f "2"    = 2
             <indexterm><primary>constructor fields, strict</primary></indexterm>
           </term>
           <listitem>
-            <para>This option causes all constructor fields which are
-            marked strict (i.e. &ldquo;!&rdquo;) 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 (see <xref
+            <para><emphasis>On by default.</emphasis>. This option
+            causes all constructor fields which are marked strict
+            (i.e. &ldquo;!&rdquo;) 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 (see <xref
             linkend="unpack-pragma"/>) to every strict constructor
             field that fulfils the size restriction.
             </para>