instaceof_op2.diff

diff --git a/ext/opcache/Optimizer/sccp.c b/ext/opcache/Optimizer/sccp.c
index 25b51b6..14daac2 100644
--- a/ext/opcache/Optimizer/sccp.c
+++ b/ext/opcache/Optimizer/sccp.c
@@ -329,6 +329,25 @@ static zend_bool try_replace_op2(
 		if (zend_optimizer_update_op2_const(ctx->scdf.op_array, opline, &zv)) {
 			return 1;
 		} else {
+			switch (opline->opcode) {
+				case ZEND_FETCH_CLASS:
+					if (Z_TYPE(zv) == IS_STRING) {
+						ZEND_ASSERT((opline + 1)->opcode == ZEND_INSTANCEOF);
+						ZEND_ASSERT((opline + 1)->op2.var == opline->result.var);
+						if (zend_optimizer_update_op2_const(ctx->scdf.op_array, opline + 1, &zv)) {
+							zend_ssa_op *next_op = ssa_op + 1;
+							zend_optimizer_remove_live_range_ex(ctx->scdf.op_array, opline->result.var, ssa_op - ctx->scdf.ssa->ops);
+							zend_ssa_unlink_use_chain(ctx->scdf.ssa, next_op - ctx->scdf.ssa->ops, next_op->op2_use);
+							next_op->op2_use = -1;
+							next_op->op2_use_chain = -1;
+							zend_ssa_remove_result_def(ctx->scdf.ssa, ssa_op);
+							MAKE_NOP(opline);
+							return 1;
+						}
+					}
+				default:
+					break;
+			}
 			zval_ptr_dtor_nogc(&zv);
 		}
 	}
diff --git a/ext/opcache/Optimizer/zend_optimizer.c b/ext/opcache/Optimizer/zend_optimizer.c
index 97be113..d5975f1 100644
--- a/ext/opcache/Optimizer/zend_optimizer.c
+++ b/ext/opcache/Optimizer/zend_optimizer.c
@@ -347,6 +347,10 @@ int zend_optimizer_update_op2_const(zend_op_array *op_array,
 		case ZEND_FAST_CALL:
 			return 0;
 		case ZEND_FETCH_CLASS:
+			if ((opline + 1)->opcode == ZEND_INSTANCEOF &&
+				(opline + 1)->op2.var == opline->result.var) {
+				return 0;
+			}
 		case ZEND_INIT_FCALL_BY_NAME:
 		/*case ZEND_INIT_NS_FCALL_BY_NAME:*/
 		case ZEND_ADD_INTERFACE: