1 files changed, 9 insertions, 0 deletions

diff --git a/src/lj_lib.h b/src/lj_lib.h
index 1cba3778..59a0f2be 100644
--- a/src/lj_lib.h
+++ b/src/lj_lib.h
@@ -48,6 +48,15 @@ LJ_FUNC int lj_lib_checkopt(lua_State *L, int narg, int def, const char *lst);
 #define lj_lib_upvalue(L, n) \
   (&gcref((L->base-1)->fr.func)->fn.c.upvalue[(n)-1])
 
+#ifdef LUA_USE_WIN
+#define lj_lib_checkfpu(L) \
+  do { setnumV(L->top++, (lua_Number)1437217655); \
+    if (lua_tointeger(L, -1) != 1437217655) lj_err_caller(L, LJ_ERR_BADFPU); \
+    L->top--; } while (0)
+#else
+#define lj_lib_checkfpu(L)      UNUSED(L)
+#endif
+
 /* Library function declarations. Scanned by buildvm. */
 #define LJLIB_CF(name)          static int lj_cf_##name(lua_State *L)
 #define LJLIB_ASM(name)         static int lj_ffh_##name(lua_State *L)