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Optimize table length computation with hinting.

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10x faster on loop with t[#t+1] = x idiom. Also used by table.insert.
This commit is contained in:
Mike Pall
2020-05-27 19:20:44 +02:00
parent b2307c8ad8
commit 1a4ff13117
12 changed files with 135 additions and 82 deletions
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4
src/lj_record.c
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@@ -1058,7 +1058,7 @@ static TRef rec_mm_len(jit_State *J, TRef tr, TValue *tv)
lj_record_call(J, func, 2);
} else {
if (LJ_52 && tref_istab(tr))
return lj_ir_call(J, IRCALL_lj_tab_len, tr);
return emitir(IRTI(IR_ALEN), tr, TREF_NIL);
lj_trace_err(J, LJ_TRERR_NOMM);
}
return 0; /* No result yet. */
@@ -2191,7 +2191,7 @@ void lj_record_ins(jit_State *J)
if (tref_isstr(rc))
rc = emitir(IRTI(IR_FLOAD), rc, IRFL_STR_LEN);
else if (!LJ_52 && tref_istab(rc))
rc = lj_ir_call(J, IRCALL_lj_tab_len, rc);
rc = emitir(IRTI(IR_ALEN), rc, TREF_NIL);
else
rc = rec_mm_len(J, rc, rcv);
break;