From: daurnimator <quae@daurnimator.com>
Date: Fri, 2 Jan 2015 21:48:25 +0000 (-0500)
Subject: luatz/tzfile: Make use of IDIV opcode when available (Lua 5.3+)
X-Git-Url: https://git.madduck.net/etc/awesome.git/commitdiff_plain/e8263f466bf4da10b9577ac6029b3c2f5e1750fb?ds=sidebyside

luatz/tzfile: Make use of IDIV opcode when available (Lua 5.3+)
---

diff --git a/luatz/timetable.lua b/luatz/timetable.lua
index 7058d7f..783d60b 100644
--- a/luatz/timetable.lua
+++ b/luatz/timetable.lua
@@ -1,8 +1,16 @@
 local strftime = require "luatz.strftime".strftime
 local strformat = string.format
 local floor = math.floor
-local function idiv ( n , d )
-	return floor ( n / d )
+local idiv do
+	-- Try and use actual integer division when available (Lua 5.3+)
+	local idiv_loader, err = (loadstring or load)([[return function(n,d) return n//d end]], "idiv")
+	if idiv_loader then
+		idiv = idiv_loader()
+	else
+		idiv = function(n, d)
+			return floor(n/d)
+		end
+	end
 end