New entry.

From-SVN: r16712

gcc/LITERATURE

@@ -17,6 +17,10 @@ Collected papers/sites on standards, compilers, optimization, etc.
 	http://www.goof.com/pcg/docs.html
 
 
+- AMD site with optimization guide for x86
+
+	http://www.amd.com/K6/k6docs/pdf/21828a.pdf
+
 - Links related to many compiler topics
 
 	http://www.nullstone.com/htmls/connections.htm