compile.c: check mid

* compile.c (iseq_peephole_optimize): check that method ID is +@.
  fix up r62039.
  http://d.hatena.ne.jp/nagachika/20180125/ruby_trunk_changes_62025_62039#r62039

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62041 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/compile.c b/compile.c
index 490ddd5951..0585c294c1 100644
--- a/compile.c
+++ b/compile.c
@@ -2842,7 +2842,9 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
 	 * =>
 	 *  send <:+@, 0, ARG_SIMPLE>
 	 */
-	if ((ci->flag & VM_CALL_ARGS_SIMPLE) && ci->orig_argc == 0) {
+	if (ci->mid == idUPlus &&
+	    (ci->flag & VM_CALL_ARGS_SIMPLE) &&
+	    ci->orig_argc == 0) {
 	    ELEM_REMOVE(list);
 	    return COMPILE_OK;
 	}