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Optimize lookups in empty proxy tables.

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This commit is contained in:
Mike Pall 2011-04-10 21:43:21 +02:00
parent a1f66abe4e
commit 23f847f4ed
1 changed files with 7 additions and 1 deletions
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8
src/lj_record.c
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@ -1016,6 +1016,12 @@ static TRef rec_idx_key(jit_State *J, RecordIndex *ix)
}
/* Otherwise the key is located in the hash part. */
if (t->hmask == 0) { /* Shortcut for empty hash part. */
/* Guard that the hash part stays empty. */
TRef tmp = emitir(IRTI(IR_FLOAD), ix->tab, IRFL_TAB_HMASK);
emitir(IRTGI(IR_EQ), tmp, lj_ir_kint(J, 0));
return lj_ir_kkptr(J, niltvg(J2G(J)));
}
if (tref_isinteger(key)) /* Hash keys are based on numbers, not ints. */
ix->key = key = emitir(IRTN(IR_CONV), key, IRCONV_NUM_INT);
if (tref_isk(key)) {
@ -1105,7 +1111,7 @@ TRef lj_record_idx(jit_State *J, RecordIndex *ix)
xref = rec_idx_key(J, ix);
xrefop = IR(tref_ref(xref))->o;
loadop = xrefop == IR_AREF ? IR_ALOAD : IR_HLOAD;
/* NYI: workaround until lj_meta_tset() inconsistency is solved. */
/* The lj_meta_tset() inconsistency is gone, but better play safe. */
oldv = xrefop == IR_KKPTR ? (cTValue *)ir_kptr(IR(tref_ref(xref))) : ix->oldv;
if (ix->val == 0) { /* Indexed load */