This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
[wwwdocs, PATCH, committed] Document function specific options
- From: Michael Meissner <gnu at the-meissners dot org>
- To: gcc-patches at gcc dot gnu dot org
- Date: Wed, 23 Jul 2008 06:39:17 -0400
- Subject: [wwwdocs, PATCH, committed] Document function specific options
I committed the following patch to document the new ability to add function
specific optimization options and on the x86, target options.
[wwwwdocs/htdocs/gcc-4.4]
2008-07-23 Michael Meissner <gnu@the-meissners.org>
* changes.html: Document new optimize and option attributes and
pragmas.
--- htdocs/gcc-4.4/changes.html.~1.17.~ 2008-07-12 04:21:14.000000000 -0400
+++ htdocs/gcc-4.4/changes.html 2008-07-23 06:19:25.000000000 -0400
@@ -87,11 +87,31 @@
<h2>General Optimizer Improvements</h2>
+ <ul>
+ <li>A new command-line switch <code>-ftree-switch-conversion</code> has
+ been added. This new pass turns simple initializations of scalar
+ variables in switch statements into initializations from a static array,
+ given that all the values are known at compile time and the ratio between
+ the new array size and the original switch branches does not exceed
+ the parameter <code>--param switch-conversion-max-branch-ratio</code>
+ (default is eight). </li>
+ </ul>
<h2>New Languages and Language specific improvements</h2>
<h3>C family</h3>
+ <ul>
+ <li>A new <code>optimize</code> attribute was added to allow programmers to
+ change the optimization level and particular optimization options for an
+ individual function. You can also change the optimization options via the
+ <code>GCC optimize</code> pragma for functions defined after the pragma. The
+ <code>cold</code> attribute now turns on the <code>-Os</code> optimization
+ option and <code>hot</code> attribute turns on the <code>-O3</code>
+ optimization option.</li>
+
+ </ul>
+
<h3>C++</h3>
<ul>
<li><a href="cxx0x_status.html">Improved experimental support for the upcoming
@@ -141,6 +161,8 @@
<li>GCC can now utilize the SVML library for vectorizing calls to
a set of C99 functions if <code>-mveclibabi=svml</code> is specified
and you link to an SVML ABI compatible library.</li>
+ <li>A new <code>option</code> attribute was added to allow programmers to change the target options like <code>-msse2</code> or <code>-march=k8</code> for an individual function. You can also change the target options via the <code>GCC option</code> pragma for functions defined after the pragma.</li>
+
</ul>
<h3>MIPS</h3>
--
Michael Meissner
email: gnu@the-meissners.org
http://www.the-meissners.org