From 7d930ec694dc079a252323d2136fbf4d49a49888 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 12 Mar 2015 11:04:04 -0300
Subject: use 'log2' when available

---
 lmathlib.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'lmathlib.c')

diff --git a/lmathlib.c b/lmathlib.c
index 1925e826..466d2fe0 100644
--- a/lmathlib.c
+++ b/lmathlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lmathlib.c,v 1.113 2014/11/07 11:31:58 roberto Exp roberto $
+** $Id: lmathlib.c,v 1.114 2014/12/27 20:32:26 roberto Exp roberto $
 ** Standard mathematical library
 ** See Copyright Notice in lua.h
 */
@@ -183,6 +183,9 @@ static int math_log (lua_State *L) {
     res = l_mathop(log)(x);
   else {
     lua_Number base = luaL_checknumber(L, 2);
+#if !defined(LUA_USE_C89)
+    if (base == 2.0) res = l_mathop(log2)(x); else
+#endif
     if (base == 10.0) res = l_mathop(log10)(x);
     else res = l_mathop(log)(x)/l_mathop(log)(base);
   }
-- 
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