From baf96a567d8294c80ff6dbda12f1af5dd1b539ab Mon Sep 17 00:00:00 2001
From: Arthur David Olson <ado@elsie>
Date: Wed, 18 Oct 1995 16:36:05 -0400
Subject: [PATCH] 64-bit architecture speedup

SCCS-file: localtime.c
SCCS-SID: 7.46
---
 localtime.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/localtime.c b/localtime.c
index 800378e..a65e3fd 100644
--- a/localtime.c
+++ b/localtime.c
@@ -1173,6 +1173,17 @@ register struct tm * const		tmp;
 	if (tmp->tm_wday < 0)
 		tmp->tm_wday += DAYSPERWEEK;
 	y = EPOCH_YEAR;
+#define CYCLE_DAYS	1022679L	/* Any consecutive CYCLE_DAYS days... */
+#define CYCLE_YEARS	2800L		/* make up exactly CYCLE_YEARS years. */
+	if (days >= CYCLE_DAYS || days <= -CYCLE_DAYS) {
+		register int	cycles;
+
+		cycles = (days >= 0) ?
+			(days / CYCLE_DAYS) :
+			(-1 - (-1 - days) / CYCLE_DAYS);
+		days -= cycles * CYCLE_DAYS;
+		y += cycles * CYCLE_YEARS;
+	}
 	if (days >= 0)
 		for ( ; ; ) {
 			yleap = isleap(y);