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author | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2015-03-12 11:04:04 -0300 |
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committer | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2015-03-12 11:04:04 -0300 |
commit | 7d930ec694dc079a252323d2136fbf4d49a49888 (patch) | |
tree | 4d3db40260fb528b18db102be804e0e4015f87f8 /lmathlib.c | |
parent | 0cf3b6495a9eb58b7e50f43d633414aabab199af (diff) | |
download | lua-github-7d930ec694dc079a252323d2136fbf4d49a49888.tar.gz |
use 'log2' when available
Diffstat (limited to 'lmathlib.c')
-rw-r--r-- | lmathlib.c | 5 |
1 files changed, 4 insertions, 1 deletions
@@ -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); } |