tree.c (substitute_in_expr, case 'e'): Only make recursive call on an operand if...

	* tree.c (substitute_in_expr, case 'e'): Only make recursive call
	on an operand if it has a PLACEHOLDER_EXPR.

From-SVN: r64595

diff --git a/gcc/tree.c b/gcc/tree.c
index 30a1c59..8cb27aa 100644 (file)
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -1890,8 +1890,13 @@ substitute_in_expr (exp, f, r)
          else if (code == CONSTRUCTOR)
            abort ();
 
-         op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
-         op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
+         op0 = TREE_OPERAND (exp, 0);
+         op1 = TREE_OPERAND (exp, 1);
+         if (contains_placeholder_p (op0))
+           op0 = substitute_in_expr (op0, f, r);
+         if (contains_placeholder_p (op1))
+           op1 = substitute_in_expr (op1, f, r);
+
          if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
            return exp;
 
@@ -1917,9 +1922,17 @@ substitute_in_expr (exp, f, r)
          else if (code != COND_EXPR)
            abort ();
 
-         op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
-         op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
-         op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r);
+         op0 = TREE_OPERAND (exp, 0);
+         op1 = TREE_OPERAND (exp, 1);
+         op2 = TREE_OPERAND (exp, 2);
+
+         if (contains_placeholder_p (op0))
+           op0 = substitute_in_expr (op0, f, r);
+         if (contains_placeholder_p (op1))
+           op1 = substitute_in_expr (op1, f, r);
+         if (contains_placeholder_p (op2))
+           op2 = substitute_in_expr (op2, f, r);
+
          if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
              && op2 == TREE_OPERAND (exp, 2))
            return exp;