Some further zlib-rs benchmarks using commit c9b7299fa81ca2a8448cbe3e96a42275c9b41b24
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.
| 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(); |
| 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 |
| 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) |
| //@ 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. |
| 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: |
| 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 | |
| } |
run and validate with
rm -f extrafield.zip && python add_unix_extra_field.py && zipinfo -v extrafield.zipthis should show
Archive: extrafield.zip
| // compile with | |
| // | |
| // $ clang -shared -o libcrc32.so -Wall -Werror -fpic -march=native -O3 crc32.c | |
| // | |
| // This command only works on x86_64 systems that support the pclmulqdq instruction. | |
| #include <immintrin.h> | |
| #include <wmmintrin.h> | |
| #include <smmintrin.h> // _mm_extract_epi32 | |
| #include <inttypes.h> | |
| #include <stdio.h> |