* doc/tree-ssa.texi: Remove references to VDEF and add descriptions

	of V_MAY_DEF and V_MUST_DEF.
	* tree-dfa.c (dfa_stats_d): Add num_v_must_defs and rename
	num_vdefs to num_v_may_defs.
	(compute_immediate_uses_for_stmt): Rename occurences of vdef
	to v_may_def.
	(redirect_immediate_uses): Ditto.
	(dump_dfa_stats): Ditto. Also added code to dump num_v_must_defs.
	(collect_dfa_stats_r): Rename occurences of vdef to v_may_def.
	Also add code to sum up the number of v_must_defs.
	(vdefs_disappeared_p): Replace with...
	(v_may_defs_disappeared_p): This.
	(v_must_defs_disappeared_p): New function.
	(mark_new_vars_to_rename): Rename occurences of vdef to v_may_def.
	Also add code to mark new variables found in V_MUST_DEFs for
	renameing.
	* tree-flow.h (stmt_ann_d): Add v_must_def_ops and replace
	vdef_ops to v_may_def_ops.
	(get_vdef_ops): Replace with...
	(get_v_may_def_ops): This.
	* tree-flow-inline.h (get_vdef_ops): Replace with...
	(get_v_may_def_ops): This.
	(get_v_must_def_ops): New function.
	(get_vdef_result_ptr): Replace with...
	(get_v_may_def_result_ptr): This.
	(get_vdef_op_ptr): Ditto with...
	(get_v_may_def_op_ptr); This.
	(get_v_must_def_op_ptr): New function.
	* tree-into-ssa.c (mark_def_sites): Rename occurences of vdef
	to v_may_def. Also add code to mark statements with
	V_MUST_DEFs as definition sites.
	(rewrite_stmt): Rename occurences of vdef to v_may_def. Also
	add code to register new V_MUST_DEFs made by the statement.
	* tree-outof-ssa.c (VIRTUAL_PARTITION): Update comments.
	(check_replaceable): Rename occurences of vdef to v_may_def. Also
	add check for V_MUST_DEFs.
	(find_replaceable_in_bb): Ditto.
	* tree-pretty-print.c (dump_vops): Rename occurences of vdef
	to v_may_def. Also add code to dump V_MUST_DEFs.
	* tree-sra.c (mark_all_vdefs): Replace with...
	(mark_all_v_may_defs): This.
	(mark_all_v_must_defs): New function.
	(create_scalar_copies): Replace call to mark_all_vdefs with
	calls to mark_all_v_may_defs and mark_all_v_must_defs.
	(scalarize_structures): Rename occurences of vdef to v_may_def.
	Also add a check for V_MUST_DEFs.
	(scalarize_modify_expr): Rename occurences of vdef to v_may_def.
	* tree-ssa-alias.c (global_var): Update comment.
	(compute_may_aliases): Ditto.
	(compute_points_to_and_addr_escape): Rename occurences of vdef
	to v_may_def. Also add code to mark variables in V_MUST_DEF
	operands as being written to.
	(group_aliases): Update comment.
	(maybe_create_global_var): Ditto.
	* tree-ssa.c (verify_ssa): Rename occurences of vdef to v_may_def.
	Also add a check for V_MUST_DEFs on GIMPLE registers.
	(replace_immediate_uses): Rename occurences of vdef to v_may_def.
	* tree-ssa-ccp.c (visit_stmt): Rename occurences of vdef
	to v_may_def. Also add code to mark all V_MUST_DEF operands
	VARYING.
	(initialize): Ditto.
	(set_rhs): Rename occurences of vdef to v_may_def. Also add
	code to update SSA_NAMEs in V_MUST_DEFs.
	* tree-ssa-copy.c (cprop_into_stmt): Rename occurences of vdef
	to v_may_def.
	* tree-ssa-dce.c (mark_stmt_if_obviously_necessary): Rename
	occurences of vdef to v_may_def. Also add code to mark statements
	with V_MUST_DEFs as necessary.
	(propagate_necessity): Rename occurences of vdef to v_may_def.
	* tree-ssa-dom.c (redirect_edges_and_update_ssa_graph): Rename
	occurences of vdef to v_may_def. Also add code to mark operands
	in V_MUST_DEFs for renaming.
	(eliminate_redundant_computations): Rename occurences of vdef
	to v_may_def.
	(record_equivalences_from_stmt): Rename occurences of vdef
	to v_may_def. Also add code to record VUSEs for V_MUST_DEFs.
	(optimize_stmt): Remove unnesessary variable vdefs. Update
	comment.
	(register_definitions_for_stmt): Rename occurences of vdef
	to v_may_def. Also add code to register definitions made with
	V_MUST_DEFs.
	* tree-ssa-dse.c (fix_stmt_vdefs): Replace with...
	(fix_stmt_v_may_defs): This.
	(fix_phi_uses): Rename occurences of vdef to v_may_def.
	(dse_optimize_stmt): Ditto.
	* tree-ssa-live.c (create_ssa_var_map): Rename occurences of vdef
	to v_may_def. Also add code to mark V_MUST_DEF operands as being
	used in virtual operators.
	* tree-ssa-loop.c (mark_defs_for_rewrite): Rename occurences of
	vdef to v_may_def. Also add code to mark V_MUST_DEF operands for
	renaming.
	* tree-ssa-operands.c (opf_kill_def): New flag for killing
	definitions.
	(build_vdefs): Renamed to...
	(build_v_may_defs): This.
	(build_v_must_defs): New variable.
	(voperands_d): Add v_must_def_ops and replace vdef_ops with
	v_may_def_ops.
	(append_vdef): Replace with...
	(append_v_may_def): This.
	(append_v_must_def): New function.
	(NUM_FREE): Increment for V_MUST_DEF
	(optype_freelist): Increment its size for V_MUST_DEF
	(allocate_vdef_optype): Replace with...
	(allocate_v_may_def_optype): This.
	(allocate_v_must_def_optype): New function.
	(free_vdefs): Replace with...
	(free_v_may_defs): This.
	(free_v_must_defs): New function.
	(remove_vdefs): Replace with...
	(remove_v_may_defs): This.
	(remove_v_must_defs): New function.
	(init_ssa_operands): Rename occurences of vdef to v_may_def. Also
	add code to initialize build_v_must_defs.
	(finalize_ssa_vdefs): Replace with...
	(finalize_ssa_v_may_defs): This.
	(finalize_ssa_vuses): Rename occurences of vdef to v_may_def.
	(finalize_ssa_v_must_defs): New function.
	(finalize_ssa_stmt_operands): Replace call to finalize_ssa_vdefs
	with calls to finalize_ssa_v_may_defs and finalize_ssa_v_must_defs.
	(verify_start_operands): Rename occurences of vdef to v_may_def.
	Also add check for build_v_must_defs.
	(get_stmt_operands): Rename occurences of vdef to v_may_def.
	Also add code to handle V_MUST_DEFs and to use opf_kill_def for
	killing definitions.
	(get_expr_operands): Update comment and use opf_kill_def for
	killing definitions.
	(add_stmt_operand): Replace code that appends VDEFs with code
	that appends V_MUST_DEFs when opf_kill_def is set and V_MAY_DEFs
	otherwise.
	(add_call_clobber_ops): Update comments.
	* tree-ssa-operands.h (vdef_optype_d): Replace with...
	(v_may_def_optype_d): This.
	(v_must_def_optype_d): New structure.
	(VDEF_OPS): Replace with...
	(V_MAY_DEF_OPS): This.
	(STMT_VDEF_OPS): Same with...
	(STMT_V_MAY_DEF_OPS): This.
	(NUM_VDEFS): And...
	(NUM_V_MAY_DEFS): This.
	(VDEF_RESULT_PTR): As well as...
	(V_MAY_DEF_RESULT_PTR): This.
	(VDEF_RESULT): Same goes for...
	(V_MAY_DEF_RESULT): This.
	(VDEF_OP_PTR): And...
	(V_MAY_DEF_OP_PTR): This.
	(VDEF_OP): And...
	(V_MAY_DEF_OP): This.
	(V_MUST_DEF_OPS): New macro.
	(STMT_V_MUST_DEF_OPS): Ditto.
	(NUM_V_MUST_DEFS): Ditto.
	(V_MUST_DEF_OP_PTR): Ditto.
	(V_MUST_DEF_OP): Ditto.
	(remove_vdefs): Replace signature with...
	(remove_v_may_defs): This.
	(remove_v_must_defs): New function signature.
	* tree-ssa-pre.c (subst_phis): Replace call to remove_vdefs
	with calls to remove_v_may_defs and remove_v_must_defs.
	(process_left_occs_and_kills): Rename occurences of vdef to v_may_def.
	Also add code that marks left occurences of operands in V_MUST_DEFs.
	* tree-tailcall.c (find_tail_calls): Rename occurences of vdef
	to v_may_def. Also add check for V_MUST_DEFs.
	(eliminate_tail_call):Rename occurences of vdef to v_may_def.

testsuite:

	* gcc.dg/tree-ssa/20031015-1.c: Scan for
	V_MAY_DEF instead of VDEF.
	* gcc.dg/tree-ssa/20040517-1.c: Ditto.


git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@82947 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 26 insertions, 13 deletions

diff --git a/gcc/tree-ssa-dce.c b/gcc/tree-ssa-dce.c
index 7921a9f0cf6..90bcf211612 100644
--- a/gcc/tree-ssa-dce.c
+++ b/gcc/tree-ssa-dce.c
@@ -286,7 +286,8 @@ static void
 mark_stmt_if_obviously_necessary (tree stmt, bool aggressive)
 {
   def_optype defs;
-  vdef_optype vdefs;
+  v_may_def_optype v_may_defs;
+  v_must_def_optype v_must_defs;
   stmt_ann_t ann;
   size_t i;
 
@@ -387,11 +388,22 @@ mark_stmt_if_obviously_necessary (tree stmt, bool aggressive)
         }
     }
 
-  vdefs = VDEF_OPS (ann);
-  for (i = 0; i < NUM_VDEFS (vdefs); i++)
+  v_may_defs = V_MAY_DEF_OPS (ann);
+  for (i = 0; i < NUM_V_MAY_DEFS (v_may_defs); i++)
     {
-      tree vdef = VDEF_RESULT (vdefs, i);
-      if (need_to_preserve_store (vdef))
+      tree v_may_def = V_MAY_DEF_RESULT (v_may_defs, i);
+      if (need_to_preserve_store (v_may_def))
+	{
+	  mark_stmt_necessary (stmt, true);
+	  return;
+        }
+    }
+    
+  v_must_defs = V_MUST_DEF_OPS (ann);
+  for (i = 0; i < NUM_V_MUST_DEFS (v_must_defs); i++)
+    {
+      tree v_must_def = V_MUST_DEF_OP (v_must_defs, i);
+      if (need_to_preserve_store (v_must_def))
 	{
 	  mark_stmt_necessary (stmt, true);
 	  return;
@@ -558,10 +570,10 @@ propagate_necessity (struct edge_list *el)
       else
 	{
 	  /* Propagate through the operands.  Examine all the USE, VUSE and
-	     VDEF operands in this statement.  Mark all the statements which
-	     feed this statement's uses as necessary.  */
+	     V_MAY_DEF operands in this statement.  Mark all the statements 
+	     which feed this statement's uses as necessary.  */
 	  vuse_optype vuses;
-	  vdef_optype vdefs;
+	  v_may_def_optype v_may_defs;
 	  use_optype uses;
 	  stmt_ann_t ann;
 	  size_t k;
@@ -577,12 +589,13 @@ propagate_necessity (struct edge_list *el)
 	  for (k = 0; k < NUM_VUSES (vuses); k++)
 	    mark_operand_necessary (VUSE_OP (vuses, k));
 
-	  /* The operands of VDEF expressions are also needed as they
+	  /* The operands of V_MAY_DEF expressions are also needed as they
 	     represent potential definitions that may reach this
-	     statement (VDEF operands allow us to follow def-def links).  */
-	  vdefs = VDEF_OPS (ann);
-	  for (k = 0; k < NUM_VDEFS (vdefs); k++)
-	    mark_operand_necessary (VDEF_OP (vdefs, k));
+	     statement (V_MAY_DEF operands allow us to follow def-def 
+	     links).  */
+	  v_may_defs = V_MAY_DEF_OPS (ann);
+	  for (k = 0; k < NUM_V_MAY_DEFS (v_may_defs); k++)
+	    mark_operand_necessary (V_MAY_DEF_OP (v_may_defs, k));
 	}
     }
 }