JIT: Fixed register allocation in case of integer overflow

Author: dstogov

ext/opcache/jit/zend_jit_x86.dasc

@@ -15733,8 +15733,9 @@ static zend_regset zend_jit_get_scratch_regset(const zend_op *opline, const zend
 					    (ssa_op->op1_use != current_var || !last_use)) {
 						ZEND_REGSET_INCL(regset, ZREG_R0);
 					}
-					res_info = OP1_INFO();
+					res_info = RES_INFO();
 					if (res_info & MAY_BE_DOUBLE) {
+						ZEND_REGSET_INCL(regset, ZREG_R0);
 						ZEND_REGSET_INCL(regset, ZREG_XMM0);
 						ZEND_REGSET_INCL(regset, ZREG_XMM1);
 					}

ext/opcache/tests/jit/add_010.phpt

@@ -0,0 +1,18 @@
+--TEST--
+JIT ADD: 010 overflow handling
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.file_update_protection=0
+opcache.jit_buffer_size=1M
+--SKIPIF--
+<?php if (PHP_INT_SIZE != 8) die("skip: 64-bit only"); ?>
+--FILE--
+<?php
+function foo($a) {
+    var_dump($a+$a=$a+$a=$a+$a=$a);
+}
+foo(PHP_INT_MAX);
+?>
+--EXPECT--
+float(7.378697629483821E+19)