Description:
------------
I have a very basic script for getting the ammount of PrimeNumbers by doing cascaded loops. It's mainly for testing execution times of differen programming languages.

When enabling the JIT options, the final result of the script shows an incorrect result.

Test was with Alpha3 of Php8, but could not choose that version in Dropdown yet.

--------
skaeser@whiplash:~/code/php$ time php7.4 TestPrime.php 
Testing Primes until: 250000
Primect: 22044

real	0m56,470s
user	0m56,456s
sys	0m0,009s
skaeser@whiplash:~/code/php$ time php8.0 TestPrime.php 
Testing Primes until: 250000
Primect: 22044

real	0m43,745s
user	0m43,733s
sys	0m0,008s
skaeser@whiplash:~/code/php$ time php8.0 -d opcache.enable_cli=1 -d opcache.jit_buffer_size=50000000 -d opcache.jit=1235 TestPrime.php 
Testing Primes until: 250000
Primect: 124998

real	0m0,023s
user	0m0,014s
sys	0m0,009s

 

Test script:
---------------
<?php
$max = 250000;
$cnt = 0;
echo "Testing Primes until: " . $max . "\n";
for ($i = 2; $i <= $max; $i++)
{
        if (testPrime($i)) $cnt++;
}
echo "Primect: {$cnt}\n";

function testPrime(int $a): bool
{
        if ($a < 2) 
        {
                return false;
        }
        else if ($a == 2) 
        {
                return true;
        }
        for ($j = 2; $j < $a; $j++)
        {
                if (($a % $j) == 0) 
                {
                        return false;
                }
        }
        return true;
}


Expected result:
----------------
Testing Primes until: 250000
Primect: 22044

Actual result:
--------------
Only with JIT enabled:

Testing Primes until: 250000
Primect: 124998