From: Dmitry Stogov <dmitry@zend.com>
Date: Tue, 28 Jul 2020 16:02:08 +0000 (+0300)
Subject: Prevent incorrect optimization
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=251e667488fffa39f900c686a7df862aeade176b;p=php

Prevent incorrect optimization
---

diff --git a/ext/opcache/jit/zend_jit_x86.dasc b/ext/opcache/jit/zend_jit_x86.dasc
index 9229b278f1..0c8d847dec 100644
--- a/ext/opcache/jit/zend_jit_x86.dasc
+++ b/ext/opcache/jit/zend_jit_x86.dasc
@@ -4083,7 +4083,8 @@ static int zend_jit_math_double_long(dasm_State    **Dst,
 {
 	zend_reg result_reg;
 
-	if (zend_is_commutative(opcode)) {
+	if (zend_is_commutative(opcode)
+	 && (Z_MODE(res_addr) != IS_REG || Z_MODE(op1_addr) != IS_REG || Z_REG(res_addr) != Z_REG(op1_addr))) {
 		if (Z_MODE(res_addr) == IS_REG) {
 			result_reg = Z_REG(res_addr);
 		} else {