PR tree-optimization/13756
* doc/invoke.texi (Options That Control Optimization): Document
-ftree-dse.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@128146
138bc75d-0d04-0410-961f-
82ee72b054a4
+2007-09-05 Rask Ingemann Lambertsen <rask@sygehus.dk>
+
+ PR web/32965
+ PR tree-optimization/13756
+ * doc/invoke.texi (Options That Control Optimization): Document
+ -ftree-dse.
+
2007-09-05 Uros Bizjak <ubizjak@gmail.com>
* gcc/config/i386/cpuid.h: New file.
performs jump threading (to reduce jumps to jumps). This flag is
enabled by default at @option{-O} and higher.
+@item -ftree-dse
+@opindex ftree-dse
+Perform dead store elimination (DSE) on trees. A dead store is a store into
+a memory location which will later be overwritten by another store without
+any intervening loads. In this case the earlier store can be deleted. This
+flag is enabled by default at @option{-O} and higher.
+
@item -ftree-ch
Perform loop header copying on trees. This is beneficial since it increases
effectiveness of code motion optimizations. It also saves one jump. This flag