[php-src] Issue #10195: Incorrect arithmetic calculations when using JIT
| From: | GajowyJ | Date: | Sat, 31 Dec 2022 03:33:50 +0000 |
| Subject: | [php-src] Issue #10195: Incorrect arithmetic calculations when using JIT | ||
| Groups: | php.bugs | ||
| Request: | Send a blank email to php-bugs+get-243294@lists.php.net to get a copy of this message | ||
Issue: https://github.com/php/php-src/issues/10195
Author: GajowyJ
### Description
The problem is hard to reproduce because it depends on the code previously executed in an
incomprehensible way. I have a function like below:
```php
<?php
function Tangential2XY($tang,$sol)
{
print("=>Tangential2XY\n");
var_dump($tang,$sol);
$x = $sol['X']['k']*$tang['KSI'] +
$sol['X']['e']*$tang['ETA'] + $sol['X'][1];
$y = $sol['Y']['k']*$tang['KSI'] +
$sol['Y']['e']*$tang['ETA'] + $sol['Y'][1];
$x = $sol['xc']*($x+1);
$y = $sol['yc']*($y+1);
var_dump($x,$y);
return ['x'=>$x,'y'=>$y];
```
For exactly the same input data I got different results, depending on the previous operations
executed. Switching off JIT (opcache.enable_cli=0) producess correct results.
Resulted (sometimes) in this output:
```
=>Tangential2XY
array(2) {
["KSI"]=>
float(-0.0001819685080039859)
["ETA"]=>
float(8.862282985990099E-5)
}
array(8) {
["X"]=>
array(3) {
["k"]=>
float(-222.47396149883136)
["e"]=>
float(-8.132167973459502)
[1]=>
float(-0.033852713544306225)
}
["Y"]=>
array(3) {
["k"]=>
float(-14.389222777371765)
["e"]=>
float(393.0672227450047)
[1]=>
float(-0.034318122126483344)
}
["rRA0"]=>
float(1.0777157410495175)
["cosDEC0"]=>
float(0.5485071919403858)
["sinDEC0"]=>
float(0.8361458367950371)
["xc"]=>
int(968)
["yc"]=>
int(548)
["spp"]=>
float(0.957071427611752)
}
float(1.0059098455606683)
float(1.0031349928784863)
```
But I expected this output instead:
```
=>Tangential2XY
array(2) {
["KSI"]=>
float(-0.0001819685080039859)
["ETA"]=>
float(8.862282985990099E-5)
}
array(8) {
["X"]=>
array(3) {
["k"]=>
float(-222.47396149883136)
["e"]=>
float(-8.132167973459502)
[1]=>
float(-0.033852713544306225)
}
["Y"]=>
array(3) {
["k"]=>
float(-14.389222777371765)
["e"]=>
float(393.0672227450047)
[1]=>
float(-0.034318122126483344)
}
["rRA0"]=>
float(1.0777157410495175)
["cosDEC0"]=>
float(0.5485071919403858)
["sinDEC0"]=>
float(0.8361458367950371)
["xc"]=>
int(968)
["yc"]=>
int(548)
["spp"]=>
float(0.957071427611752)
}
float(973.720730502727)
float(549.7179760974104)
```
### PHP Version
PHP 8.0.26
### Operating System
Windows 10