0.64.0

Wilfred/difftastic0.64.0Jun 15, 2025by github-actions[bot]

AI Summary

This release adds Verilog and SystemVerilog support, switches the memory allocator from MiMalloc to Jemalloc with a performance regression, and updates CI to Ubuntu 22.04 requiring newer glibc.

Key Highlights

Added Verilog and SystemVerilog support
Switched from MiMalloc to Jemalloc (up to 20% performance regression)
CI now uses Ubuntu 22.04 (newer glibc required)
Stricter file detection for UTF-8 and compression formats
Updated tree-sitter parsers for Erlang, F#, Gleam, Pascal, Swift

Breaking Changes

Performance regression of up to 20% due to memory allocator change
Prebuilt binaries require newer glibc (Ubuntu 22.04 or equivalent)

New Features

Verilog and SystemVerilog parsing support
Recognition of zstd and bzip2 as binary files

Full Release Notes

Difftastic is a structural diff tool that understands syntax. See [the manual](https://difftastic.wilfred.me.uk/) to get started, and [the changelog](https://github.com/Wilfred/difftastic/blob/master/CHANGELOG.md) for historical changes.

### Parsing

Updated to the latest tree-sitter parser for Erlang, F#, Gleam, Pascal and Swift.

File detection is now stricter for UTF-8, and recognises more compression file types as binary (e.g. zstd or bzip2).

Added support for Verilog and SystemVerilog.

### Build

CI on GitHub now uses Ubuntu 22.04 for Linux builds (previously Ubuntu 20.04), so prebuilt binaries will require a newer glibc version to run.

### Internal

Difftastic has switched from MiMalloc to Jemalloc for allocation. This is modest performance regression (up to 20% longer runtime in testing). Jemalloc is currently easier to build (see issue #805) and has fewer pathological performance corner cases.