compiler/benchmark/min-max

Integer min/max benchmark

This benchmark repeatedly clamps integer values and accumulates a checksum. It isolates two-argument integer min() / max() calls; it is not representative of every PHP workload. It emits one line after the loop, so terminal output is not part of the hot path.

From this directory, with PHP 8.5 and a matching PHPX/embed installation:

php run.php 10000000
php ../../bin/tpc.php project.yml --no-progress -o min_max_benchmark
./min_max_benchmark 10000000

The PHP and AOT checksums must match. Compile baseline and candidate revisions into different build directories and binary paths, then alternate their execution order. Exclude compilation time, discard a warm-up pair, and compare medians over multiple runs. Keep PHPX, PHP, compiler flags, and machine fixed.

Sample result

Linux ARM64 in Docker, PHP 8.5.10 ZTS, PHPX 6a68f38, GCC -O2; baseline TypePHP 72b7ce9b versus this integer min/max lowering change. Nine measured runs per binary after one discarded pair, 10,000,000 iterations:

Build	Median	Range
Baseline	482.56 ms	456.41–497.78 ms
Integer lowering	48.01 ms	44.10–57.38 ms

This is a 10.05x speedup for the isolated integer min/max workload. Timings come from a shared development machine, not a dedicated benchmark host. Raw samples are in results-arm64.json; times include process startup and exclude compilation.