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Flexible limit for use of registers by constructors

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Instead of a fixed limit of 50 registers (which, in a bad worst case,
can limit the nesting of constructors to 5 levels), the compiler
computes an individual limit for each constructor based on how many
registers are available when it runs. This limit then controls the
frequency of SETLIST instructions.
This commit is contained in:
Roberto Ierusalimschy
2024-06-27 11:24:27 -03:00
parent fb7e5b76c9
commit 9904c253da
5 changed files with 31 additions and 7 deletions
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2
lcode.c
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@@ -1804,7 +1804,7 @@ void luaK_settablesize (FuncState *fs, int pc, int ra, int asize, int hsize) {
** table (or LUA_MULTRET to add up to stack top).
*/
void luaK_setlist (FuncState *fs, int base, int nelems, int tostore) {
lua_assert(tostore != 0 && tostore <= LFIELDS_PER_FLUSH);
lua_assert(tostore != 0);
if (tostore == LUA_MULTRET)
tostore = 0;
if (nelems <= MAXARG_C)