folkertdev

typedef unsigned char   Bool;
       typedef unsigned char   UChar;
       typedef int             Int32;
       typedef unsigned int    UInt32;
#define True  ((Bool)1)
#define BZ_X_MAGIC_1     10
typedef    struct {
             char *next_in;
          }
          bz_stream;

folkertdev

zlib-rs labeled match benchmarks

build the toolchain

A proof of concept implementation can be found at https://github.com/trifectatechfoundation/rust/tree/labeled-match. Build it with ./x build, and then set up the toolchain. Now cargo +stage1 build should use a compiler with labeled-match available.

run the benchmark

git clone https://github.com/trifectatechfoundation/zlib-rs.git

folkertdev

Some further zlib-rs benchmarks using commit c9b7299fa81ca2a8448cbe3e96a42275c9b41b24

Bounds checks

Rust will panic when you try to index out of bounds

This check has a cost: your CPU must perform this check. Typically this involves two instructions: a compare "is the index in bounds" and a jump "go to the panic code". Hence, we intuitively expect programs that perform bounds checking to be slightly slower. In theory, C has an edge here because it does not, by default, check that array access is in bounds.

folkertdev

use std::ffi::{c_int, c_uint};

// we use the libz_sys but configure zlib-ng in zlib compat mode
use libz_sys as libz_ng_sys;

use zlib_rs::{DeflateFlush, ReturnCode};

fn main() {
    let mut it = std::env::args();

folkertdev

    Finished `dev` profile [unoptimized] target(s) in 0.05s
WARNING: The `change-id` is missing in the `config.toml`. This means that you will not be able to track the major changes made to the bootstrap configurations.
NOTE: to silence this warning, add `change-id = 127866` at the top of `config.toml`
Building stage0 library artifacts (x86_64-unknown-linux-gnu)
    Finished `release` profile [optimized + debuginfo] target(s) in 0.11s
Building compiler artifacts (stage0 -> stage1, x86_64-unknown-linux-gnu)
    Finished `release` profile [optimized + debuginfo] target(s) in 0.19s
Creating a sysroot for stage1 compiler (use `rustup toolchain link 'name' build/host/stage1`)
Building stage0 tool lld-wrapper (x86_64-unknown-linux-gnu)
    Finished `release` profile [optimized + debuginfo] target(s) in 0.10s

folkertdev

WARNING: The `change-id` is missing in the `config.toml`. This means that you will not be able to track the major changes made to the bootstrap configurations.
NOTE: to silence this warning, add `change-id = 127866` at the top of `config.toml`
Building stage0 library artifacts (x86_64-unknown-linux-gnu)
Building compiler artifacts (stage0 -> stage1, x86_64-unknown-linux-gnu)
Creating a sysroot for stage1 compiler (use `rustup toolchain link 'name' build/host/stage1`)
Building stage0 tool lld-wrapper (x86_64-unknown-linux-gnu)
Building stage1 library artifacts (x86_64-unknown-linux-gnu)
Building stage0 tool compiletest (x86_64-unknown-linux-gnu)
Testing stage1 compiletest suite=ui mode=ui (x86_64-unknown-linux-gnu)

folkertdev

//@ needs-asm-support
//@ ignore-nvptx64
//@ ignore-spirv

#![feature(asm_const)]

use std::arch::{asm, global_asm};

// Const operands must be integers and must be constants.

folkertdev

folkertdev

from dataclasses import dataclass

import tsp_python
from tsp_python import AsyncStore, OwnedVid, ReceivedTspMessageVariant, FlatReceivedTspMessage

class ReceivedTspMessage:
    @staticmethod
    def from_flat(msg: FlatReceivedTspMessage):
        match msg.variant:
            case ReceivedTspMessageVariant.GenericMessage:

folkertdev

pub fn decode2(buf: &[u8], size_max: usize, num: &mut u64) -> usize {
    let number = unsafe { core::ptr::read_unaligned(buf.as_ptr().cast()) };

    let bits = unsafe { core::arch::x86_64::_pext_u64(number, 0x7F7F_7F7F_7F7F_7F7Fu64) };
    let bytes_used = (number & !0x7F7F_7F7F_7F7F_7F7Fu64).count_ones();

    *num = bits | (buf[8] as u64) << 56;

    (size_max > 0) as usize + bytes_used as usize
}