Fix -fprofile-use ICE.

PR rtl-optimization/16490
* cfgrtl.c (cfg_layout_split_edge): Set global_live_at_start and
global_live_at_end for new basic block if already set for other blocks.

From-SVN: r85813

gcc/ChangeLog

+2004-08-11  James E Wilson  <wilson@specifixinc.com>
+
+	PR rtl-optimization/16490
+	* cfgrtl.c (cfg_layout_split_edge): Set global_live_at_start and
+	global_live_at_end for new basic block if already set for other blocks.
+
 2004-08-11 David Edelsohn  <edelsohn@gnu.org>
 
 	* config/rs6000/rs6000.h (MAX_FIXED_MODE_SIZE): Define.

gcc/cfgrtl.c

@@ -2781,6 +2781,18 @@ cfg_layout_split_edge (edge e)
 			? NEXT_INSN (BB_END (e->src)) : get_insns (),
 			NULL_RTX, e->src);
 
+  /* ??? This info is likely going to be out of date very soon, but we must
+     create it to avoid getting an ICE later.  */
+  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,
+		    e->dest->global_live_at_start);
+    }
+
   new_e = make_edge (new_bb, e->dest, EDGE_FALLTHRU);
   redirect_edge_and_branch_force (e, new_bb);