Fix ia64 abort while compiling gcc.c-torture/unsorted/logic.c.

	* regmove.c (optimize_reg_copy_1): If no REG_DEAD note, check for
	and handle REG_UNUSED note on insn.

From-SVN: r30813

gcc/ChangeLog

 Mon Dec  6 15:12:14 1999  Jim Wilson  <wilson@cygnus.com>
 
+	* regmove.c (optimize_reg_copy_1): If no REG_DEAD note, check for
+	and handle REG_UNUSED note on insn.
+
 	* combine.c (force_to_mode, case LSHIFTRT): New local inner_mask.  Set
 	inner_mask instead of mask.
 

gcc/regmove.c

@@ -528,6 +528,14 @@ optimize_reg_copy_1 (insn, dest, src)
 	      REG_NOTES (insn) = note;
 	    }
 
+	  /* DEST is also dead if INSN has a REG_UNUSED note for DEST.  */
+	  if (! dest_death
+	      && (dest_death = find_regno_note (insn, REG_UNUSED, dregno)))
+	    {
+	      PUT_REG_NOTE_KIND (dest_death, REG_DEAD);
+	      remove_note (insn, dest_death);
+	    }
+
 	  /* Put death note of DEST on P if we saw it die.  */
 	  if (dest_death)
 	    {