time.c: benchmark recovery

* time.c (time_localtime): check if `vtm.zone` is a simple zone
  name string before trying to call the conversion method.  since
  r64952, `Time.getlocal` on UTC time has lost the performance
  about 45%, due to this call.  the performance is about 90% of
  r64951 by avoiding it.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65360 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/time.c b/time.c
index f801ee5ac1..dc4a8dbd4d 100644
--- a/time.c
+++ b/time.c
@@ -3623,6 +3623,7 @@ time_localtime(VALUE time)
 {
     struct time_object *tobj;
     struct vtm vtm;
+    VALUE zone;
 
     GetTimeval(time, tobj);
     if (TZMODE_LOCALTIME_P(tobj)) {
@@ -3633,7 +3634,8 @@ time_localtime(VALUE time)
 	time_modify(time);
     }
 
-    if (!NIL_P(tobj->vtm.zone) && zone_localtime(tobj->vtm.zone, time)) {
+    zone = tobj->vtm.zone;
+    if (maybe_tzobj_p(zone) && zone_localtime(zone, time)) {
         return time;
     }