[PATCH 2/2] Enable flag_tree_loop_distribute_memset_zero at -O3.

[Sebastian Pop <sebpop@gmail.com>]

---
 gcc/doc/invoke.texi |    1 +
 gcc/opts.c          |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 2d61382..ca3238c 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -6944,6 +6944,7 @@ DO I = 1, N
 ENDDO
 @end smallexample
 and the initialization loop is transformed into a call to memset zero.
+This flag is enabled by default at @option{-O3}.
 
 @item -ftree-loop-im
 @opindex ftree-loop-im
diff --git a/gcc/opts.c b/gcc/opts.c
index 07d7a23..16a337c 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -862,6 +862,7 @@ decode_options (unsigned int argc, const char **argv,
 
   /* -O3 optimizations.  */
   opt3 = (optimize >= 3);
+  flag_tree_loop_distribute_memset_zero = opt3;
   flag_predictive_commoning = opt3;
   flag_inline_functions = opt3;
   flag_unswitch_loops = opt3;
-- 
1.7.0.4