Convert some evrp uses in DOM to the range_query API.

DOM is the last remaining user of the evrp engine.  This patch converts
a few uses of the engine and vr-values into the new API.

There is one subtle change.  The call to vr_value's
op_with_constant_singleton_value_range can theoretically return
non-constants, unlike the range_query API which only returns constants.
In this particular case it doesn't matter because the symbolic stuff will
have been handled by the const_and_copies/avail_exprs read in the
SSA_NAME_VALUE copy immediately before.  I have verified this is the case
by asserting that all calls to op_with_constant_singleton_value_range at
this point return either NULL or an INTEGER_CST.

Tested on x86-64 Linux with a regstrap, as well as the aforementioned
assert.

gcc/ChangeLog:

	* gimple-ssa-evrp-analyze.h (class evrp_range_analyzer): Remove
	vrp_visit_cond_stmt.
	* tree-ssa-dom.c (cprop_operand): Convert to range_query API.
	(cprop_into_stmt): Same.
	(dom_opt_dom_walker::optimize_stmt): Same.

2 files changed, 11 insertions, 13 deletions

diff --git a/gcc/gimple-ssa-evrp-analyze.h b/gcc/gimple-ssa-evrp-analyze.h
index 0a70a1e..4cf82e6 100644
--- a/gcc/gimple-ssa-evrp-analyze.h
+++ b/gcc/gimple-ssa-evrp-analyze.h
@@ -38,13 +38,6 @@ class evrp_range_analyzer : public vr_values
   /* Record a new unwindable range.  */
   void push_value_range (tree var, value_range_equiv *vr);
 
-  /* A bit of a wart.  This should ideally go away.  */
-  void vrp_visit_cond_stmt (gcond *cond, edge *e)
-  {
-    simplify_using_ranges simpl (this);
-    simpl.vrp_visit_cond_stmt (cond, e);
-  }
-
  private:
   DISABLE_COPY_AND_ASSIGN (evrp_range_analyzer);
 
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c
index f58b6b7..a8a5b34 100644
--- a/gcc/tree-ssa-dom.c
+++ b/gcc/tree-ssa-dom.c
@@ -1810,7 +1810,7 @@ record_equivalences_from_stmt (gimple *stmt, int may_optimize_p,
    CONST_AND_COPIES.  */
 
 static void
-cprop_operand (gimple *stmt, use_operand_p op_p, vr_values *vr_values)
+cprop_operand (gimple *stmt, use_operand_p op_p, range_query *query)
 {
   tree val;
   tree op = USE_FROM_PTR (op_p);
@@ -1820,7 +1820,12 @@ cprop_operand (gimple *stmt, use_operand_p op_p, vr_values *vr_values)
      CONST_AND_COPIES.  */
   val = SSA_NAME_VALUE (op);
   if (!val)
-    val = vr_values->op_with_constant_singleton_value_range (op);
+    {
+      value_range r;
+      tree single;
+      if (query->range_of_expr (r, op, stmt) && r.singleton_p (&single))
+	val = single;
+    }
 
   if (val && val != op)
     {
@@ -1878,7 +1883,7 @@ cprop_operand (gimple *stmt, use_operand_p op_p, vr_values *vr_values)
    vdef_ops of STMT.  */
 
 static void
-cprop_into_stmt (gimple *stmt, vr_values *vr_values)
+cprop_into_stmt (gimple *stmt, range_query *query)
 {
   use_operand_p op_p;
   ssa_op_iter iter;
@@ -1895,7 +1900,7 @@ cprop_into_stmt (gimple *stmt, vr_values *vr_values)
 	 operands.  */
       if (old_op != last_copy_propagated_op)
 	{
-	  cprop_operand (stmt, op_p, vr_values);
+	  cprop_operand (stmt, op_p, query);
 
 	  tree new_op = USE_FROM_PTR (op_p);
 	  if (new_op != old_op && TREE_CODE (new_op) == SSA_NAME)
@@ -2203,8 +2208,8 @@ dom_opt_dom_walker::optimize_stmt (basic_block bb, gimple_stmt_iterator *si,
 		 SSA_NAMES.  */
 	      update_stmt_if_modified (stmt);
 	      edge taken_edge = NULL;
-	      m_evrp_range_analyzer->vrp_visit_cond_stmt
-		(as_a <gcond *> (stmt), &taken_edge);
+	      simplify_using_ranges simpl (m_evrp_range_analyzer);
+	      simpl.vrp_visit_cond_stmt (as_a <gcond *> (stmt), &taken_edge);
 	      if (taken_edge)
 		{
 		  if (taken_edge->flags & EDGE_TRUE_VALUE)