Hello Vladimir,
This patch fixes a trivial bug of SMS: distance1_uses needs to be
initialized if newly allocated.
Since the original author of SMS is not active for a very long time,
it would be nice if you can apply it for me : )
Thanks.
Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog (revision 206279)
+++ gcc/ChangeLog (working copy)
@@ -1,3 +1,8 @@
+2013-01-02 Felix Yang <fei.yang0...@gmail.com>
+
+ * modulo-sched.c (schedule_reg_moves): Clear distance1_uses if it
+ is newly allocated.
+
2013-01-01 Jan-Benedict Glaw <jbg...@lug-owl.de>
* config/nios2/nios2.h (BITS_PER_UNIT): Don't define it.
Index: gcc/modulo-sched.c
===================================================================
--- gcc/modulo-sched.c (revision 206279)
+++ gcc/modulo-sched.c (working copy)
@@ -766,6 +766,9 @@ schedule_reg_moves (partial_schedule_ptr ps)
distance1_uses = distances[1] ? sbitmap_alloc (g->num_nodes) : NULL;
+ if (distance1_uses)
+ bitmap_clear (distance1_uses);
+
/* Every use of the register defined by node may require a different
copy of this register, depending on the time the use is scheduled.
Record which uses require which move results. */
Cheers,
Felix
