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<?php

require_once __DIR__ . '/shared.php';

function main(?string $headCommitHash, ?string $baseCommitHash) {

if ($headCommitHash === null || $baseCommitHash === null) {

fwrite(STDERR, "Usage: php generate_diff.php HEAD_COMMIT_HASH BASE_COMMIT_HASH\n");

exit(1);

}

$repo = __DIR__ . '/repos/data';

cloneRepo($repo, 'git@github.com:php/benchmarking-data.git');

$baseCommitHash = find_benchmarked_commit_hash($repo, $baseCommitHash);

$headSummaryFile = $repo . '/' . substr($headCommitHash, 0, 2) . '/' . $headCommitHash . '/summary.json';

$baseSummaryFile = $repo . '/' . substr($baseCommitHash, 0, 2) . '/' . $baseCommitHash . '/summary.json';

if (!file_exists($headSummaryFile)) {

return "Head commit '$headCommitHash' not found\n";

}

if (!file_exists($baseSummaryFile)) {

return "Base commit '$baseCommitHash' not found\n";

}

$headSummary = json_decode(file_get_contents($headSummaryFile), true);

$baseSummary = json_decode(file_get_contents($baseSummaryFile), true);

$headCommitHashShort = substr($headCommitHash, 0, 7);

$baseCommitHashShort = substr($baseCommitHash, 0, 7);

$output .= "|---|---|---|---|\n";

foreach ($headSummary as $name => $headBenchmark) {

if ($name === 'branch') {

continue;

}

$baseInstructions = $baseSummary[$name]['instructions'] ?? null;

$headInstructions = $headSummary[$name]['instructions'];

$output .= "| $name | "

. formatInstructions($baseInstructions) . " | "

. formatInstructions($headInstructions) . " | "

. formatDiff($baseInstructions, $headInstructions) . " |\n";

}

return $output;

}

function formatInstructions(?int $instructions): string {

if ($instructions === null) {

return '-';

}

if ($instructions > 1e6) {

return sprintf('%.0fM', $instructions / 1e6);

} elseif ($instructions > 1e3) {

return sprintf('%.0fK', $instructions / 1e3);

} else {

return (string) $instructions;

}

function formatDiff(?int $baseInstructions, int $headInstructions): string {

if ($baseInstructions === null) {

return '-';

}

$instructionDiff = $headInstructions - $baseInstructions;

return sprintf('%.2f%%', $instructionDiff / $baseInstructions * 100);

}

function find_benchmarked_commit_hash(string $repo, string $commitHash): ?string {

$repeat = 100;

while (true) {

if ($repeat-- <= 0) {

fwrite(STDERR, "Count not find benchmarked commit hash\n");

exit(1);

}

$summaryFile = $repo . '/' . substr($commitHash, 0, 2) . '/' . $commitHash . '/summary.json';

if (file_exists($summaryFile)) {

break;

}

$commitHash = trim(runCommand(

['git', 'rev-parse', $commitHash . '^'],

dirname(__DIR__),

printCommand: false,

)->stdout);

}

return $commitHash;

}

$headCommitHash = $argv[1] ?? null;

$baseCommitHash = $argv[2] ?? null;

$output = main($headCommitHash, $baseCommitHash);

fwrite(STDOUT, $output);

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