invoke.texi (-O3): Add -ftree-vectorize to the list of optimizations turned on under -O3.

	* doc/invoke.texi (-O3): Add -ftree-vectorize to the list of
	optimizations turned on under -O3.
	(ftree-vectorize): Add that the flag is turned on with -O3.

From-SVN: r133364

gcc/ChangeLog

+2008-03-20  Ira Rosen  <irar@il.ibm.com>
+
+	* doc/invoke.texi (-O3): Add -ftree-vectorize to the list of
+	optimizations turned on under -O3.
+	(ftree-vectorize): Add that the flag is turned on with -O3.
+
 2008-03-20  Ben Elliston  <bje@au.ibm.com>
 
 	* regmove.c (try_auto_increment): Fix spelling error in comment.

gcc/doc/invoke.texi

@@ -5164,8 +5164,8 @@ invoking @option{-O2} on programs that use computed gotos.
 @opindex O3
 Optimize yet more.  @option{-O3} turns on all optimizations specified by
 @option{-O2} and also turns on the @option{-finline-functions},
-@option{-funswitch-loops}, @option{-fpredictive-commoning} and
-@option{-fgcse-after-reload} options.
+@option{-funswitch-loops}, @option{-fpredictive-commoning},
+@option{-fgcse-after-reload} and @option{-ftree-vectorize} options.
 
 @item -O0
 @opindex O0
@@ -5949,7 +5949,8 @@ enabled by default at @option{-O} and higher.
 
 @item -ftree-vectorize
 @opindex ftree-vectorize
-Perform loop vectorization on trees.
+Perform loop vectorization on trees. This flag is enabled by default at
+@option{-O3}.
 
 @item -ftree-vect-loop-version
 @opindex ftree-vect-loop-version