From: Paul Eggert <eggert@cs.ucla.edu>
Date: Fri, 16 Mar 2012 10:15:57 +0000 (-0700)
Subject: mktime: simplify computation of average
X-Git-Tag: upstream/2.30~10815
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=94c7d826c97ec1ae6ced9f83fe1fe6cfcc235edb;p=external%2Fglibc.git

mktime: simplify computation of average

* time/mktime.c (ranged_convert): Use new time_t_avg function
instead of rolling our own (probably-slower) code.
---

diff --git a/ChangeLog b/ChangeLog
index 066a6da..e795eca 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2012-05-23  Paul Eggert  <eggert@cs.ucla.edu>
 
+	mktime: simplify computation of average
+	* time/mktime.c (ranged_convert): Use new time_t_avg function
+	instead of rolling our own (probably-slower) code.
+
 	mktime: do not assume signed right shift propagates sign bit
 	* time/mktime.c (isdst_differ): New static function.
 	(__mktime_internal): No need to normalize tm_isdst now.
diff --git a/time/mktime.c b/time/mktime.c
index dd7daaf..f4d9cf1 100644
--- a/time/mktime.c
+++ b/time/mktime.c
@@ -319,9 +319,7 @@ ranged_convert (struct tm *(*convert) (const time_t *, struct tm *),
 	 they differ by 1.  */
       while (bad != ok + (bad < 0 ? -1 : 1))
 	{
-	  time_t mid = *t = (bad < 0
-			     ? bad + ((ok - bad) >> 1)
-			     : ok + ((bad - ok) >> 1));
+	  time_t mid = *t = time_t_avg (ok, bad);
 	  r = convert (t, tp);
 	  if (r)
 	    ok = mid;