compilers

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Matt Godbolt's blog
2 months ago
- The author wishes readers well during the holiday season, emphasizing family time and a non-religious Christmas celebration with a roast dinner.
- The Advent of Compiler Optimisations 2025 series was a year-long project, enjoyable but demanding, and the author notes a bias toward C, C++, and x86 architectures.
- The author has half-researched ideas for future posts but cannot commit due to full-time work, and may share a 'making of' follow-up.
- The author thanks various supporters (not listed in detail) and expresses appreciation for the compiler community, highlighting compilers as modern miracles.
- The post marks day 25 of a 25-day series, written by a human and reviewed by LLMs and humans, with a link to an accompanying video.
I hate compilers
2 months ago
- The author discusses the challenges of non-deterministic compiler output, particularly when building WebAssembly from C/C++, citing issues like embedded date/time macros, clang invoking different versions of `wasm-opt`, and address layout dependencies in exception handling.
- To achieve reproducible builds, the author disables address-space randomization and creates architecture-specific SHA256 checksums for both x86_64 and arm64, ensuring at least per-architecture determinism.
- The work is part of implementing a WebAssembly-based proof of work check for Anubis, where the author uses `wasm2js` to recompile WebAssembly to JavaScript for clients with WASM disabled, but faces reproducibility hurdles in compiler toolchain dependencies.
Sequentialising Parallel Moves
2 months ago
- Parallel moves require simultaneous assignment; naive sequentialization can cause errors due to dependencies and cycles.
- A location transfer graph models dependencies; correct ordering is a post-order traversal of this graph.
- Cycles in the graph are resolved by using a single temporary register to break the cycle.
- Algorithms like the one by Leroy et al. use recursion and status tracking to sequentialize moves efficiently.
Pixuma: Fundamentals of Computer Science and Mathematics
2 months ago
- Instant access to video lectures with no subscriptions required.
- Engagement with other students via discussion board.
- Certificate of completion awarded at the end of the course.
- 14-day money-back guarantee offered on all courses.
- Courses are well-structured, cover computer graphics, compilers, and game development, and are suitable for both beginners and experienced learners.
- High student satisfaction with 71% returning for another course; no discounts ever offered.
Show HN: Decomp Academy – Learn to decompile GameCube games into matching C
3 months ago
- Learn to read assembly and write C that compiles to identical bytecode for retro games.
- Progress through 264 lessons covering core C idioms, data types, pointers, structs, floats, ABI, optimization, and real decompilation examples.
- Use original compilers to grade C code byte-for-byte against actual game functions.
- Start from basics like arithmetic and loops, advancing to advanced topics like 64-bit operations and GameCube/GBA-specific patterns.
- Includes practical exercises like decompiling functions from Star Fox Adventures and mastering compiler optimizations.

compilers

Matt Godbolt's blog

I hate compilers

Sequentialising Parallel Moves

Pixuma: Fundamentals of Computer Science and Mathematics

Show HN: Decomp Academy – Learn to decompile GameCube games into matching C