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useless 'instanceof' removal pass #194

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useless 'instanceof' removal pass #194

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14 changes: 14 additions & 0 deletions Optimizer/pass1_5.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,20 @@ if (ZEND_OPTIMIZER_PASS_1 & OPTIMIZATION_LEVEL) {

while (opline < end) {
switch (opline->opcode) {
case ZEND_INSTANCEOF:
if ((opline + 1)->opcode == ZEND_FREE) { /* useless instanceof */
MAKE_NOP(opline);
MAKE_NOP((opline + 1));

/* It is safe to remove FETCH_CLASS, it was ZEND_FETCH_CLASS_NO_AUTOLOAD anyway */
if ((opline - 1)->opcode == ZEND_FETCH_CLASS) {
if (ZEND_OP2_TYPE(opline - 1) == IS_CONST) {
literal_dtor(&ZEND_OP2_LITERAL(opline - 1));
}
MAKE_NOP((opline -1));
}
}
break;
case ZEND_ADD:
case ZEND_SUB:
case ZEND_MUL:
Expand Down