tree-ssa-dom.c (dom_opt_dom_walker::optimize_stmt): Pass down the vr_values instance...

	* tree-ssa-dom.c (dom_opt_dom_walker::optimize_stmt): Pass down
	the vr_values instance to cprop_into_stmt.
	(cprop_into_stmt): Pass vr_values instance down to cprop_operand.
	(cprop_operand): Also query EVRP to determine if OP is a constant.

From-SVN: r263342

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 81a1116..4cfae1a 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-08-06  Jeff Law  <law@redhat.com>
+
+       * tree-ssa-dom.c (dom_opt_dom_walker::optimize_stmt): Pass down
+       the vr_values instance to cprop_into_stmt.
+       (cprop_into_stmt): Pass vr_values instance down to cprop_operand.
+       (cprop_operand): Also query EVRP to determine if OP is a constant.
+       
 2018-08-06  Nathan Sidwell  <nathan@acm.org>
 
        * diagnostic.c (diagnostic_report_current_module): Reroll

diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c
index a6f176c..267880f 100644 (file)
--- a/gcc/tree-ssa-dom.c
+++ b/gcc/tree-ssa-dom.c
@@ -1700,7 +1700,7 @@ record_equivalences_from_stmt (gimple *stmt, int may_optimize_p,
    CONST_AND_COPIES.  */
 
 static void
-cprop_operand (gimple *stmt, use_operand_p op_p)
+cprop_operand (gimple *stmt, use_operand_p op_p, vr_values *vr_values)
 {
   tree val;
   tree op = USE_FROM_PTR (op_p);
@@ -1709,6 +1709,9 @@ cprop_operand (gimple *stmt, use_operand_p op_p)
      copy of some other variable, use the value or copy stored in
      CONST_AND_COPIES.  */
   val = SSA_NAME_VALUE (op);
+  if (!val)
+    val = vr_values->op_with_constant_singleton_value_range (op);
+
   if (val && val != op)
     {
       /* Do not replace hard register operands in asm statements.  */
@@ -1765,7 +1768,7 @@ cprop_operand (gimple *stmt, use_operand_p op_p)
    vdef_ops of STMT.  */
 
 static void
-cprop_into_stmt (gimple *stmt)
+cprop_into_stmt (gimple *stmt, vr_values *vr_values)
 {
   use_operand_p op_p;
   ssa_op_iter iter;
@@ -1782,7 +1785,7 @@ cprop_into_stmt (gimple *stmt)
         operands.  */
       if (old_op != last_copy_propagated_op)
        {
-         cprop_operand (stmt, op_p);
+         cprop_operand (stmt, op_p, vr_values);
 
          tree new_op = USE_FROM_PTR (op_p);
          if (new_op != old_op && TREE_CODE (new_op) == SSA_NAME)
@@ -1925,7 +1928,7 @@ dom_opt_dom_walker::optimize_stmt (basic_block bb, gimple_stmt_iterator si)
   opt_stats.num_stmts++;
 
   /* Const/copy propagate into USES, VUSES and the RHS of VDEFs.  */
-  cprop_into_stmt (stmt);
+  cprop_into_stmt (stmt, evrp_range_analyzer.get_vr_values ());
 
   /* If the statement has been modified with constant replacements,
      fold its RHS before checking for redundant computations.  */