reorg.c (fill_slots_from_thread): Update REG_DEAD/REG_UNUSED notes for any insns…

reorg.c (fill_slots_from_thread): Update REG_DEAD/REG_UNUSED notes for any insns skipped at the start of a block...

        * reorg.c (fill_slots_from_thread): Update REG_DEAD/REG_UNUSED notes
        for any insns skipped at the start of a block because they were
        redundant.

From-SVN: r19534

gcc/ChangeLog

+Tue May  5 01:15:06 1998  Jeffrey A Law  (law@cygnus.com)
+
+	* reorg.c (fill_slots_from_thread): Update REG_DEAD/REG_UNUSED notes
+	for any insns skipped at the start of a block because they were
+	redundant.
+
 Mon May  4 20:23:51 1998  Jim Wilson  <wilson@cygnus.com>
 
 	* alpha.h (DBX_CONTIN_LENGTH): Decrease to 3000.

gcc/reorg.c

@@ -3665,8 +3665,16 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
 			     && ! insn_sets_resource_p (new_thread, &needed, 1)
 			     && ! insn_references_resource_p (new_thread,
 							      &set, 1)
-			     && redundant_insn (new_thread, insn, delay_list))
-			new_thread = next_active_insn (new_thread);
+			     && (prior_insn
+				 = redundant_insn (new_thread, insn,
+						   delay_list)))
+			{
+			  /* We know we do not own the thread, so no need
+			     to call update_block and delete_insn.  */
+			  fix_reg_dead_note (prior_insn, insn);
+			  update_reg_unused_notes (prior_insn, new_thread);
+			  new_thread = next_active_insn (new_thread);
+			}
 		      break;
 		    }