[PATCH] Fix cond-expr handling in genmatch

[Richard Biener]

This fixes matching of toplevel (cond (lt @1 @2) ...) as reported by
Bin to me privately.

Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.

Richard.

2016-10-17  Richard Biener  <rguent...@suse.de>

        * genmatch.c (dt_operand::gen_gimple_expr): Use get_name to
        get at the operand to look at with TREE_OPERAND for generic
        sub-nodes.

Index: gcc/genmatch.c
===================================================================
--- gcc/genmatch.c      (revision 241228)
+++ gcc/genmatch.c      (working copy)
@@ -2644,9 +2652,11 @@ dt_operand::gen_gimple_expr (FILE *f, in
              /* ???  If this is a memory operation we can't (and should not)
                 match this.  The only sensible operand types are
                 SSA names and invariants.  */
+             char opname[20];
+             get_name (opname);
              fprintf_indent (f, indent,
-                             "tree %s = TREE_OPERAND (gimple_assign_rhs1 
(def), %i);\n",
-                             child_opname, i);
+                             "tree %s = TREE_OPERAND (%s, %i);\n",
+                             child_opname, opname, i);
              fprintf_indent (f, indent,
                              "if ((TREE_CODE (%s) == SSA_NAME\n",
                              child_opname);