diff options
author | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2015-03-12 11:04:04 -0300 |
---|---|---|
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-7d930ec694dc079a252323d2136fbf4d49a49888.tar.gz lua-7d930ec694dc079a252323d2136fbf4d49a49888.tar.bz2 lua-7d930ec694dc079a252323d2136fbf4d49a49888.zip |
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 @@ | |||
1 | /* | 1 | /* |
2 | ** $Id: lmathlib.c,v 1.113 2014/11/07 11:31:58 roberto Exp roberto $ | 2 | ** $Id: lmathlib.c,v 1.114 2014/12/27 20:32:26 roberto Exp roberto $ |
3 | ** Standard mathematical library | 3 | ** Standard mathematical library |
4 | ** See Copyright Notice in lua.h | 4 | ** See Copyright Notice in lua.h |
5 | */ | 5 | */ |
@@ -183,6 +183,9 @@ static int math_log (lua_State *L) { | |||
183 | res = l_mathop(log)(x); | 183 | res = l_mathop(log)(x); |
184 | else { | 184 | else { |
185 | lua_Number base = luaL_checknumber(L, 2); | 185 | lua_Number base = luaL_checknumber(L, 2); |
186 | #if !defined(LUA_USE_C89) | ||
187 | if (base == 2.0) res = l_mathop(log2)(x); else | ||
188 | #endif | ||
186 | if (base == 10.0) res = l_mathop(log10)(x); | 189 | if (base == 10.0) res = l_mathop(log10)(x); |
187 | else res = l_mathop(log)(x)/l_mathop(log)(base); | 190 | else res = l_mathop(log)(x)/l_mathop(log)(base); |
188 | } | 191 | } |