gcc-wwwdocs branch master updated. 08249747b2539776f2f071438e6c496e174bfcfc

[Jan Hubicka <hubicka@sourceware.org>]

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commit 08249747b2539776f2f071438e6c496e174bfcfc
Author: Jan Hubicka <hubicka@ucw.cz>
Date:   Mon Apr 26 22:25:18 2021 +0200

    Document IPA/LTO/FDO changes.

diff --git a/htdocs/gcc-11/changes.html b/htdocs/gcc-11/changes.html
index 6f58cfe8..2c98b9a3 100644
--- a/htdocs/gcc-11/changes.html
+++ b/htdocs/gcc-11/changes.html
@@ -170,6 +170,39 @@ a work-in-progress.</p>
       use <code>-g</code> together with <code>-gdwarf-2</code>,
       <code>-gdwarf-3</code> or <code>-gdwarf-4</code>.
   </li>
+  <li>
+    Inter-procedural optimization improvements:
+    <ul>
+      <li>A new IPA-modref pass was added to track side effects of function calls
+          and improve precision of points-to-analysis. The pass can be controlled
+	  by the <a href="https://gcc.gnu.org/onlinedocs/gcc-11.1.0/gcc/Optimize-Options.html#index-fipa-modref"><code>-fipa-modref</code></a> option.
+      </li>
+      <li>The identical code folding pass (controlled by <a href="https://gcc.gnu.org/onlinedocs/gcc-11.1.0/gcc/Optimize-Options.html#index-fipa-ocf"><code>-fipa-icf</code></a>)
+	  was significantly improved to increase the number of
+	  unified functions and to reduce compile-time memory use.</li>
+      <li>IPA-CP (Interprocedural constant propagation)
+	  heuristics improved its estimation of potential usefulness of
+	  known loop bounds and strides by taking the estimated frequency of
+	  these loops into account.</li>
+  </li>
+  <li>
+    Link-time optimization improvements:
+    <ul>
+      <li>The LTO bytecode format was optimized for smaller object files and
+	  faster streaming.</li>
+      <li>Memory allocation of the linking stage was improved to reduce peak
+	  memory use.</li>
+    </ul>
+  </li>
+  <li>
+    Profile driven optimization improvements:
+    <ul>
+      <li>
+        Using <a href="https://gcc.gnu.org/onlinedocs/gcc-11.1.0/gcc/Optimize-Options.html#index-fprofile-values"><code>-fprofile-values</code></a>,
+	was improved by tracking more target values for e.g. indirect calls.
+      </li>
+    </ul>
+  </li>
 </ul>
 
 <!-- .................................................................. -->

-----------------------------------------------------------------------

Summary of changes:
 htdocs/gcc-11/changes.html | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)


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