On Mon, Aug 9, 2021 at 4:49 PM tehtmi wrote:
Description of my answer, in rot13, in case anyone else wants
to try:
Qrpyner n pbafg fgevat gung vf irel ybat. Gura qrsvar n ybg bs
shapgvbaf gung hfr vg.
SOLVED!
BTW, it's a great idea to use rot13 for spoilers.
A note concerning this optimization used by Lua:
The increased size of a bytecode is usually not a problem.
But increased loading of CPU cache is always a performance hit.
Assigning a non-internable string to a local const variable is cache-unfriendly in the current implementation of Lua: the constant string would exist as multiple copies in RAM and each copy would be cached independently.
I suggest to apply this optimization (to convert local const variables to real constants) only for internable strings. Constant variables containing long strings should stay non-optimized in bytecode as if they were non-constant locals/upvalues.
static TString *loadStringN (LoadState *S, Proto *p) {
lua_State *L = S->L;
TString *ts;
luaL_Buffer b;
char *buff;
size_t size = loadSize(S);
if (size == 0) /* no string? */
return NULL;
luaL_buffinit(L, &b);
buff = luaL_prepbuffsize(b, size);
loadVector(S, buff, size); /* load string into buffer */
ts = luaS_newlstr(L, buff, size);
luaC_objbarrier(L, p, ts);
return ts;
}
Ranier Vilela
