Add ARC entry for gcc-10/changes.html

---
 htdocs/gcc-10/changes.html | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/htdocs/gcc-10/changes.html b/htdocs/gcc-10/changes.html
index 53d0ca08..4e27c05b 100644
--- a/htdocs/gcc-10/changes.html
+++ b/htdocs/gcc-10/changes.html
@@ -557,7 +557,19 @@ a work-in-progress.</p>
   much improved.</li>
 </ul>
 
-<!-- <h3 id="arc">ARC</h3> -->
+<h3 id="arc">ARC</h3>
+<ul>
+  <li>The interrupt service routine functions saves all used
+  registers, including extension registers and auxiliary registers
+  used by Zero Overhead Loops.</li>
+  <li>Improve code-size by using multiple short instructions instead
+  of a single long mov or ior instruction when its long immediate
+  constant is known.</li>
+  <li>Fix usage of the accumulator register for ARC600.</li>
+  <li>Fix issues with <code>uncached</code> attribute.</li>
+  <li>Remove <code>-mq-class</code> option.</li>
+  <li>Improve 64-bit integer addition and subtraction operations.</li>
+</ul>
 
 <h3 id="arm">arm</h3>
 <ul>
-- 
2.24.1

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