Initialize retval on bitwise_not exception

Author: nikic

Zend/tests/bitwise_not_precision_exception.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Promoting float precision warning to exception in bitwise_not
+--FILE--
+<?php
+set_error_handler(function($_, $msg) {
+    throw new Exception($msg);
+});
+try {
+    var_dump(~INF);
+} catch (Exception $e) {
+    echo $e->getMessage(), "\n";
+}
+?>
+--EXPECT--
+Implicit conversion from float INF to int loses precision

Zend/zend_operators.c

@@ -1500,6 +1500,9 @@ ZEND_API zend_result ZEND_FASTCALL bitwise_not_function(zval *result, zval *op1)
 			if (!zend_is_long_compatible(Z_DVAL_P(op1), lval)) {
 				zend_incompatible_double_to_long_error(Z_DVAL_P(op1));
 				if (EG(exception)) {
+					if (result != op1) {
+						ZVAL_UNDEF(result);
+					}
 					return FAILURE;
 				}
 			}