flow.c (redirect_edge_and_branch_force): Initialize global_live_at_start and global_live_at_end.

        * flow.c (redirect_edge_and_branch_force): Initialize
        global_live_at_start and global_live_at_end.
        (allocate_bb_life_data): Export.
        * basic-block.h (allocate_bb_life_data): Declare it.
        * toplev.c (rest_of_compilation): Call it.

From-SVN: r44023

1 files changed, 10 insertions, 2 deletions

diff --git a/gcc/flow.c b/gcc/flow.c
index ecaf9ea..56b40f0 100644
--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -483,7 +483,6 @@ static void flow_loop_tree_node_add	PARAMS ((struct loop *, struct loop *));
 static void flow_loops_tree_build	PARAMS ((struct loops *));
 static int flow_loop_level_compute	PARAMS ((struct loop *, int));
 static int flow_loops_level_compute	PARAMS ((struct loops *));
-static void allocate_bb_life_data	PARAMS ((void));
 static void find_sub_basic_blocks	PARAMS ((basic_block));
 static bool redirect_edge_and_branch 	PARAMS ((edge, basic_block));
 static basic_block redirect_edge_and_branch_force PARAMS ((edge, basic_block));
@@ -1933,6 +1932,15 @@ redirect_edge_and_branch_force (e, target)
   new_edge->probability = e->probability;
   new_edge->count = e->count;
 
+  if (e->dest->global_live_at_start)
+    {
+      new_bb->global_live_at_start = OBSTACK_ALLOC_REG_SET (&flow_obstack);
+      new_bb->global_live_at_end = OBSTACK_ALLOC_REG_SET (&flow_obstack);
+      COPY_REG_SET (new_bb->global_live_at_start,
+		    e->dest->global_live_at_start);
+      COPY_REG_SET (new_bb->global_live_at_end, new_bb->global_live_at_start);
+    }
+
   /* Wire edge in.  */
   new_edge->src = e->src;
   new_edge->dest = new_bb;
@@ -4675,7 +4683,7 @@ calculate_global_regs_live (blocks_in, blocks_out, flags)
 /* Allocate the permanent data structures that represent the results
    of life analysis.  Not static since used also for stupid life analysis.  */
 
-static void
+void
 allocate_bb_life_data ()
 {
   register int i;