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In part 1 of the "SIMD in zlib-rs" series, we've seen that, with a bit of nudging, autovectorization can produce optimal code for some problems.

But that does not always work: with SIMD clever programmers can still beat the compiler. This time we'll look at a problem where the compiler is not currently capable of using the SIMD capabilities of modern CPUs effectively.

data-compressionrust
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I'm fascinated by the creative use of SIMD instructions. When you first learn about SIMD, it is clear that doing more multiplications in a single instruction is useful for speeding up matrix multiplication. But how can all of these weird instructions be used to solve problems that aren't just arithmetic?
data-compressionrust
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Over the past couple of months we've been hard at work on libbzip2-rs, a 100% Rust drop-in compatible implementation the bzip2 compression and decompression functionality.

For this project, we used c2rust for the initial translation from the C code to a Rust implementation. The generated Rust code has now been cleaned up and made safe where possible. This post describes our experiences using c2rust for this project.

open-sourcedata-compressionrustc
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February 25, 2025

zlib-rs is faster than C

We've released version 0.4.2 of zlib-rs, featuring a number of substantial performance improvements. We are now (to our knowledge) the fastest api-compatible zlib implementation for decompression, and beat the competition in the most important compression cases too.

open-sourcedata-compressionrust
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Our zlib-rs project implements a drop-in replacement for libz.so, a dynamic library that is widely used to perform gzip (de)compression.
open-sourcedata-compressionrust
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