Online PHP editor | perf for T23MH

@ 2025-07-07T05:40:32Z

<?php

// Proposal idea of enabling the unrolling in the userland.

function measure(string $label, callable $fn): void {
    $start = hrtime(true);
    $result = $fn();
    $end = hrtime(true);
    $elapsed = ($end - $start) / 1e9;
    echo "Sum: {$result}, {$label}: " . number_format($elapsed, 6) . " seconds\n";
}

$array = range(1, 1e6);

$n = count($array);

measure("Normal for loop", function () use ($array, $n) {
    $sum = 0;
    for ($i = 0; $i < $n; $i++) {
        $sum += $array[$i];
    }
    return $sum;
}); // Sum: 500000500000, Normal for loop: 0.047172 seconds

measure("Manual Unrolled x4", function () use ($array, $n) {
    $sum = 0;
    for ($i = 0; $i < $n; $i += 4) {
        $sum += $array[$i] + $array[$i + 1] + $array[$i + 2] + $array[$i + 3];
    }
    return $sum;
}); // Sum: 500000500000, Manual Unrolled x4: 0.042200 seconds

measure("Manual Unrolled x8", function () use ($array, $n) {
    $sum = 0;
    for ($i = 0; $i < $n; $i += 8) {
        $sum += $array[$i] + $array[$i + 1] + $array[$i + 2] + $array[$i + 3]
              + $array[$i + 4] + $array[$i + 5] + $array[$i + 6] + $array[$i + 7];
    }
    return $sum;
}); // Sum: 500000500000, Manual Unrolled x8: 0.036472 seconds

// Attributed Unroll - this is handled by your modified compiler
measure("Attributed Unrolled #[Unroll(4)]", function () use ($array, $n) {
    $sum = 0;
    // @TODO: KhaledAlam: Unrolling logic of zend_compile_for( )
    // #[Unroll(4)]
    for ($i = 0; $i < $n; $i++) {
        $sum += $array[$i];
    }
    return $sum;
}); // Sum: 0, Attributed Unrolled #[Unroll(4)]: 0.000002 seconds

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

Version	System time (s)	User time (s)	Memory (MiB)
8.4.12	0.034	0.034	39.41
8.4.11	0.021	0.043	37.35
8.4.10	0.042	0.038	33.80
8.4.9	0.024	0.029	35.71
8.4.8	0.027	0.033	32.95
8.4.7	0.022	0.036	32.68
8.4.6	0.023	0.031	32.97
8.4.5	0.023	0.031	32.84
8.4.4	0.022	0.034	32.73
8.4.3	0.021	0.034	32.83
8.4.2	0.025	0.029	32.85
8.4.1	0.022	0.032	32.58
8.3.25	0.026	0.042	34.14
8.3.24	0.030	0.046	32.44
8.3.23	0.014	0.034	31.81
8.3.22	0.021	0.035	31.78
8.3.21	0.022	0.033	31.74
8.3.20	0.023	0.032	31.67
8.3.19	0.022	0.033	31.65
8.3.18	0.021	0.035	31.73
8.3.17	0.025	0.031	31.66
8.3.16	0.023	0.030	31.83
8.3.15	0.023	0.031	31.76
8.3.14	0.022	0.034	31.87
8.3.13	0.023	0.031	31.81
8.3.12	0.021	0.031	31.87
8.3.11	0.022	0.032	31.81
8.3.10	0.023	0.030	31.61
8.3.9	0.021	0.034	31.79
8.3.8	0.025	0.032	31.87
8.3.7	0.023	0.032	31.75
8.3.6	0.025	0.032	31.69
8.3.5	0.025	0.031	32.37
8.3.4	0.024	0.032	32.73
8.3.3	0.021	0.033	32.80
8.3.2	0.021	0.035	32.80
8.3.1	0.019	0.032	32.83
8.3.0	0.026	0.032	32.75
8.2.29	0.022	0.036	31.70
8.2.28	0.021	0.031	31.74
8.2.27	0.022	0.032	31.76
8.2.26	0.022	0.029	31.66
8.2.25	0.023	0.029	31.65
8.2.24	0.021	0.029	31.54
8.2.23	0.020	0.032	31.49
8.2.22	0.020	0.031	31.74
8.2.21	0.023	0.030	31.68
8.2.20	0.021	0.031	31.76
8.2.19	0.024	0.028	31.57
8.2.18	0.023	0.028	31.82
8.2.17	0.022	0.031	32.84
8.2.16	0.026	0.028	32.90
8.2.15	0.025	0.030	32.93
8.2.14	0.025	0.027	32.85
8.2.13	0.024	0.032	32.84
8.2.12	0.024	0.033	32.85
8.2.11	0.021	0.032	32.73
8.2.10	0.022	0.030	32.84
8.2.9	0.026	0.031	32.92
8.2.8	0.025	0.029	32.78
8.2.7	0.024	0.030	32.85
8.2.6	0.023	0.031	32.96
8.2.5	0.023	0.030	32.74
8.2.4	0.026	0.034	32.86
8.2.3	0.028	0.037	32.79
8.2.2	0.024	0.029	32.75
8.2.1	0.024	0.028	32.77
8.2.0	0.022	0.030	32.81

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