zerocopy 0.8.41-alpha

Zerocopy makes zero-cost memory manipulation effortless. We write "unsafe" so you don't have to.
Documentation 
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// Copyright 2026 The Fuchsia Authors
//
// Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0>, or the MIT
// license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
// This file may not be copied, modified, or distributed except according to
// those terms.

#![cfg(__ZEROCOPY_INTERNAL_USE_ONLY_NIGHTLY_FEATURES_IN_TESTS)]

use std::{path::PathBuf, process::Command};

fn run_codegen_test(bench_name: &str, target_cpu: &str, bless: bool) {
    let manifest_path = env!("CARGO_MANIFEST_PATH");
    let target_dir = env!("CARGO_TARGET_DIR");

    let output = Command::new("cargo")
        .args([
            "asm",
            "-p",
            "zerocopy",
            "--manifest-path",
            manifest_path,
            "--target-dir",
            target_dir,
            "--bench",
            bench_name,
            "--target-cpu",
            target_cpu,
            "--mca",
            "codegen_test",
        ])
        .output()
        .expect("failed to execute process");

    let actual_result = output.stdout;

    if !(output.status.success()) {
        panic!("{}", String::from_utf8_lossy(&output.stderr));
    }

    let expected_file_path = {
        let mut path: PathBuf = env!("CARGO_MANIFEST_DIR").into();
        path.push("benches");
        let file_name = format!("{bench_name}.{target_cpu}.mca");
        path.push(file_name);
        path
    };

    if bless {
        std::fs::write(expected_file_path, &actual_result).unwrap();
    } else {
        let expected_result = std::fs::read(expected_file_path).unwrap_or_default();
        if actual_result != expected_result {
            let expected = String::from_utf8_lossy(&expected_result[..]);
            panic!("Bless codegen tests with BLESS=1\nGot unexpected output:\n{}", expected);
        }
    }
}

#[test]
#[cfg_attr(miri, ignore)]
fn codegen() {
    let bless = std::env::var("BLESS").is_ok();
    let paths = std::fs::read_dir("benches").unwrap();
    for path in paths {
        let path = path.unwrap().path();
        if !path.extension().map(|s| s == "rs").unwrap_or(false) {
            continue;
        }
        let path = path.file_stem().unwrap().to_str().unwrap();
        run_codegen_test(path, "x86-64", bless);
    }
}