Minor speedup and cleanup for out-of-ssa pass

[law at redhat dot com]

It's pointless for the out-of-ssa pass to compute local/global life
information for virtual variables.  It's also rather silly to use
DEF_OP_PTR and dereference the result when just using DEF_OP is
sufficient (similarly for USE_OP_PTR/USE_OP).

Bootstrapped and regression tested on i686-pc-linux-gnu.

	* tree-ssa-live.c (calculate_live_on_entry): Ignore virtual
	variables.  Simplify slightly by using USE_OP/DEF_OP instead
	of USE_OP_PTR/DEF_OP_PTR and dereferencing the result.

Index: tree-ssa-live.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/tree-ssa-live.c,v
retrieving revision 2.1
diff -c -p -r2.1 tree-ssa-live.c
*** tree-ssa-live.c	13 May 2004 06:39:49 -0000	2.1
--- tree-ssa-live.c	14 May 2004 04:58:37 -0000
*************** calculate_live_on_entry (var_map map)
*** 551,562 ****
    basic_block bb;
    bitmap saw_def;
    tree phi, var, stmt;
!   tree *vec;
    edge e;
    varray_type stack;
    block_stmt_iterator bsi;
-   vuse_optype vuses;
-   vdef_optype vdefs;
    use_optype uses;
    def_optype defs;
    stmt_ann_t ann;
--- 551,560 ----
    basic_block bb;
    bitmap saw_def;
    tree phi, var, stmt;
!   tree op;
    edge e;
    varray_type stack;
    block_stmt_iterator bsi;
    use_optype uses;
    def_optype defs;
    stmt_ann_t ann;
*************** calculate_live_on_entry (var_map map)
*** 610,648 ****
  	  num = NUM_USES (uses);
  	  for (i = 0; i < num; i++)
  	    {
! 	      vec = USE_OP_PTR (uses, i);
! 	      add_livein_if_notdef (live, saw_def, *vec, bb);
! 	    }
! 
! 	  vuses = VUSE_OPS (ann);
! 	  num = NUM_VUSES (vuses);
! 	  for (i = 0; i < num; i++)
! 	    {
! 	      var = VUSE_OP (vuses, i);
! 	      add_livein_if_notdef (live, saw_def, var, bb);
! 	    }
! 
! 	  vdefs = VDEF_OPS (ann);
! 	  num = NUM_VDEFS (vdefs);
! 	  for (i = 0; i < num; i++)
! 	    {
! 	      var = VDEF_OP (vdefs, i);
! 	      add_livein_if_notdef (live, saw_def, var, bb);
  	    }
  
  	  defs = DEF_OPS (ann);
  	  num = NUM_DEFS (defs);
  	  for (i = 0; i < num; i++)
  	    {
! 	      vec = DEF_OP_PTR (defs, i);
! 	      set_if_valid (map, saw_def, *vec);
! 	    }
! 
! 	  num = NUM_VDEFS (vdefs);
! 	  for (i = 0; i < num; i++)
! 	    {
! 	      var = VDEF_RESULT (vdefs, i);
! 	      set_if_valid (map, saw_def, var);
  	    }
  	}
      }
--- 608,623 ----
  	  num = NUM_USES (uses);
  	  for (i = 0; i < num; i++)
  	    {
! 	      op = USE_OP (uses, i);
! 	      add_livein_if_notdef (live, saw_def, op, bb);
  	    }
  
  	  defs = DEF_OPS (ann);
  	  num = NUM_DEFS (defs);
  	  for (i = 0; i < num; i++)
  	    {
! 	      op = DEF_OP (defs, i);
! 	      set_if_valid (map, saw_def, op);
  	    }
  	}
      }