* recog.c (split_all_insns): Fix memory overflow.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@62998 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 11 insertions, 3 deletions

diff --git a/gcc/recog.c b/gcc/recog.c
index bfa988b4b16..6206be1700c 100644
--- a/gcc/recog.c
+++ b/gcc/recog.c
@@ -2882,10 +2882,18 @@ split_all_insns (upd_life)
 
       find_many_sub_basic_blocks (blocks);
 
-      while (old_last_basic_block < last_basic_block)
+      if (old_last_basic_block != last_basic_block && upd_life)
 	{
-	  SET_BIT (blocks, old_last_basic_block);
-	  old_last_basic_block++;
+	  sbitmap new_blocks = sbitmap_alloc (last_basic_block);
+
+	  sbitmap_copy (new_blocks, blocks);
+	  while (old_last_basic_block < last_basic_block)
+	    {
+	      SET_BIT (new_blocks, old_last_basic_block);
+	      old_last_basic_block++;
+	    }
+	  sbitmap_free (blocks);
+	  new_blocks = blocks;
 	}
     }