From 27d9219cf3649a195fdf7a2211efcb704cf3bffc Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 12 May 2014 18:22:05 -0300
Subject: no more integer exponentiation

---
 lobject.c |  8 +++-----
 lvm.c     | 25 ++-----------------------
 lvm.h     |  3 +--
 3 files changed, 6 insertions(+), 30 deletions(-)

diff --git a/lobject.c b/lobject.c
index bc594482..025f94b0 100644
--- a/lobject.c
+++ b/lobject.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.c,v 2.83 2014/04/30 16:48:44 roberto Exp roberto $
+** $Id: lobject.c,v 2.84 2014/05/01 18:18:06 roberto Exp roberto $
 ** Some generic functions over Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -77,7 +77,6 @@ static lua_Integer intarith (lua_State *L, int op, lua_Integer v1,
     case LUA_OPSUB:return intop(-, v1, v2);
     case LUA_OPMUL:return intop(*, v1, v2);
     case LUA_OPMOD: return luaV_mod(L, v1, v2);
-    case LUA_OPPOW: return luaV_pow(v1, v2);
     case LUA_OPIDIV: return luaV_div(L, v1, v2);
     case LUA_OPBAND: return intop(&, v1, v2);
     case LUA_OPBOR: return intop(|, v1, v2);
@@ -123,7 +122,7 @@ void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2,
       }
       else break;  /* go to the end */
     }
-    case LUA_OPDIV: {  /* operates only on floats */
+    case LUA_OPDIV: case LUA_OPPOW: {  /* operate only on floats */
       lua_Number n1; lua_Number n2;
       if (tonumber(p1, &n1) && tonumber(p2, &n2)) {
         setfltvalue(res, numarith(L, op, n1, n2));
@@ -133,8 +132,7 @@ void luaO_arith (lua_State *L, int op, const TValue *p1, const TValue *p2,
     }
     default: {  /* other operations */
       lua_Number n1; lua_Number n2;
-      if (ttisinteger(p1) && ttisinteger(p2) &&
-          (op != LUA_OPPOW || ivalue(p2) >= 0)) {
+      if (ttisinteger(p1) && ttisinteger(p2)) {
         setivalue(res, intarith(L, op, ivalue(p1), ivalue(p2)));
         return;
       }
diff --git a/lvm.c b/lvm.c
index 12e2b090..3fb8f12e 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.206 2014/05/09 14:20:52 roberto Exp roberto $
+** $Id: lvm.c,v 2.207 2014/05/12 19:13:32 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -480,22 +480,6 @@ lua_Integer luaV_mod (lua_State *L, lua_Integer m, lua_Integer n) {
 }
 
 
-lua_Integer luaV_pow (lua_Integer m, lua_Integer n) {
-  lua_assert(n >= 0);
-  if (n == 0)
-    return 1;  /* m^0 == 1 */
-  else {
-    lua_Integer r = 1;
-    for (; n > 1; n >>= 1) {
-      if (n & 1) r = intop(*, r, m);
-      m = intop(*, m, m);
-    }
-    r = intop(*, r, m);
-    return r;
-  }
-}
-
-
 /* number of bits in an integer */
 #define NBITS	cast_int(sizeof(lua_Integer) * CHAR_BIT)
 
@@ -869,12 +853,7 @@ void luaV_execute (lua_State *L) {
         TValue *rb = RKB(i);
         TValue *rc = RKC(i);
         lua_Number nb; lua_Number nc;
-        lua_Integer ic;
-        if (ttisinteger(rb) && ttisinteger(rc) && (ic = ivalue(rc)) >= 0) {
-          lua_Integer ib = ivalue(rb);
-          setivalue(ra, luaV_pow(ib, ic));
-        }
-        else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
+        if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
           setfltvalue(ra, luai_numpow(L, nb, nc));
         }
         else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_POW)); }
diff --git a/lvm.h b/lvm.h
index 548fba66..04f997dc 100644
--- a/lvm.h
+++ b/lvm.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.h,v 2.28 2014/04/15 16:32:49 roberto Exp roberto $
+** $Id: lvm.h,v 2.29 2014/04/27 14:41:11 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -40,7 +40,6 @@ LUAI_FUNC void luaV_execute (lua_State *L);
 LUAI_FUNC void luaV_concat (lua_State *L, int total);
 LUAI_FUNC lua_Integer luaV_div (lua_State *L, lua_Integer x, lua_Integer y);
 LUAI_FUNC lua_Integer luaV_mod (lua_State *L, lua_Integer x, lua_Integer y);
-LUAI_FUNC lua_Integer luaV_pow (lua_Integer x, lua_Integer y);
 LUAI_FUNC lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y);
 LUAI_FUNC void luaV_objlen (lua_State *L, StkId ra, const TValue *rb);
 
-- 
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