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Small optimization in 'luaH_psetint'

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It is quite common to write to empty but existing cells in the array
part of a table, so 'luaH_psetint' checks for the common case that
the table doesn't have a newindex metamethod to complete the write.
This commit is contained in:
Roberto Ierusalimschy 2024-01-25 13:44:49 -03:00
parent 3e9dbe143d
commit b34a97a4af
2 changed files with 5 additions and 4 deletions
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2
ltable.c
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@ -1001,7 +1001,7 @@ static int rawfinishnodeset (const TValue *slot, TValue *val) {
int luaH_psetint (Table *t, lua_Integer key, TValue *val) {
if (keyinarray(t, key)) {
lu_byte *tag = getArrTag(t, key - 1);
if (!tagisempty(*tag)) {
if (!tagisempty(*tag) || checknoTM(t->metatable, TM_NEWINDEX)) {
fval2arr(t, key, tag, val);
return HOK; /* success */
}

7
ltm.h
View File

@ -60,11 +60,12 @@ typedef enum {
*/
#define notm(tm) ttisnil(tm)
#define checknoTM(mt,e) ((mt) == NULL || (mt)->flags & (1u<<(e)))
#define gfasttm(g,et,e) ((et) == NULL ? NULL : \
((et)->flags & (1u<<(e))) ? NULL : luaT_gettm(et, e, (g)->tmname[e]))
#define gfasttm(g,mt,e) \
(checknoTM(mt, e) ? NULL : luaT_gettm(mt, e, (g)->tmname[e]))
#define fasttm(l,et,e) gfasttm(G(l), et, e)
#define fasttm(l,mt,e) gfasttm(G(l), mt, e)
#define ttypename(x) luaT_typenames_[(x) + 1]