[tree-ssa] Minor cleanup

[law@redhat.com]

This patch updates tree-ssa-dom.c to use may_propagate_copy in a couple
more places.

	* tree-ssa-dom.c (optimize_block): Use may_propagate_copy.

Index: tree-ssa-dom.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/Attic/tree-ssa-dom.c,v
retrieving revision 1.1.2.10
diff -c -3 -p -r1.1.2.10 tree-ssa-dom.c
*** tree-ssa-dom.c	23 Jul 2003 23:48:16 -0000	1.1.2.10
--- tree-ssa-dom.c	25 Jul 2003 17:32:26 -0000
*************** optimize_block (basic_block bb, tree par
*** 262,269 ****
    for (phi = phi_nodes (bb); phi; phi = TREE_CHAIN (phi))
      if (PHI_NUM_ARGS (phi) == 1
  	&& TREE_CODE (PHI_ARG_DEF (phi, 0)) == SSA_NAME
! 	&& ! SSA_NAME_OCCURS_IN_ABNORMAL_PHI (PHI_ARG_DEF (phi, 0))
! 	&& ! SSA_NAME_OCCURS_IN_ABNORMAL_PHI (PHI_RESULT (phi)))
        set_value_for (PHI_RESULT (phi), PHI_ARG_DEF (phi, 0), 
const_and_copies);
  
    /* Optimize each statement within the basic block.  */
--- 262,268 ----
    for (phi = phi_nodes (bb); phi; phi = TREE_CHAIN (phi))
      if (PHI_NUM_ARGS (phi) == 1
  	&& TREE_CODE (PHI_ARG_DEF (phi, 0)) == SSA_NAME
! 	&& may_propagate_copy (PHI_RESULT (phi), PHI_ARG_DEF (phi, 0)))
        set_value_for (PHI_RESULT (phi), PHI_ARG_DEF (phi, 0), 
const_and_copies);
  
    /* Optimize each statement within the basic block.  */
*************** optimize_block (basic_block bb, tree par
*** 292,299 ****
  		  new = get_value_for (*orig_p, const_and_copies);
  		  if (new
  		      && TREE_CODE (new) == SSA_NAME
! 		      && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (new)
! 		      && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (*orig_p))
  		    *orig_p = new;
  		  break;
  		}
--- 291,297 ----
  		  new = get_value_for (*orig_p, const_and_copies);
  		  if (new
  		      && TREE_CODE (new) == SSA_NAME
! 		      && may_propagate_copy (new, *orig_p))
  		    *orig_p = new;
  		  break;
  		}