[email protected] @HaskRay
Maintainer of LLVM MC, Clang driver, lld/ELF, and libunwind maskray.me California, USA Joined November 2012-
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The lld numbers use a pending patch adding fully parallel input-file parsing. Even without it, stock lld nearly catches mold on this clang-23 Release+Asserts --gc-sections link on Apple M4. maskray.me/blog/2026-04-1…
Link clang with --threads=8. lld vs mold flips with core width (in ms): Xeon Broadwell 2016 → 798/578 1-sock; 840/647 2-sock Alder Lake 2022 → 378 / 371 Apple M4 Max 2024 → 230 / 253 mold spreads work across cores; lld bets on per-core ILP. Wider/stronger core → lld wins.
The moment the AI starts to hallucinate or touches the core, the Elves immediately take off the ring.
They hoard code without end, until it draws the dragon (the outage). - The Three (Elves): Deliberating on architecture (Vilya, wisdom), stripping away tech debt (Nenya, cleansing), and generating the tedious boilerplate and tests (Narya, inspiration).
On agentic coding: one tool to code them all, but the same tool, in different hands, ends in different fates. - The Nine (Men): Hand everything over and outsource their thinking, until in time they become Ringwraiths. - The Seven (Dwarves): Will intact, but greed amplified.
Microsoft is upstreaming Windows x64 Unwind V3 implementation to LLVM. Unwind V3 provides correct exception-handling unwind, SEH handlers, and supports Intel APX. SFrame v3, rushed to binutils 2.46, provides stack tracing only, no EH, yet comes out larger than .eh_frame.
(compiling CTMark with Clang) Substantial reduction in instruction counts with my recent hash table optimizations to LLVM.😊 llvm-compile-time-tracker.com/compare.php?fr…
Recent LLVM hash table improvements maskray.me/blog/2026-06-0…
NXP EZH后端 github.com/llvm/llvm-proj… 目前看是一个Google员工的、基于ARM修改的单人vibe-coding项目。 AI 让生成一个 LLVM 实验性后端的成本大幅降低了，但审查它、维护它的成本一点没变——而后者要由整个社区来承担。 llvm.org/docs/Developer… 政策说LLVM对新target非常欢迎，即便是实验性的也是如此
Merged github.com/llvm/llvm-proj… The instructions:u geomean decreased by 1.27% for the stage2-O3 build!
DenseMap usage breakdown compiling in `clang -O3 ... CGExpr.cpp`: find:62.8%, insert:34.3%, erases:2.9%. Most common instantiations use pointer keys with 16-byte pair<K, V> values. Algorithm R beats Boost unordered_flat_map and Verstable in this scenario. github.com/llvm/llvm-proj…
LLVM SmallPtrSet is a hash table for small pointer keys and rare deletions. Using plain linear probing with Knuth's Algorithm R (TAOCP Vol 3 §6.4) for deletions is brilliant. Tiny code footprint, fast inserts/lookups, very slow deletions. llvm-compile-time-tracker.com/compare.php?fr…
In neovim's built-in LSP client, the current positioning of code lens seems distracting. github.com/neovim/neovim/… Left: emacs-ccls; right: neovim
Google is pushing to reintroduce bundle alignment mode in LLVM, a feature that brings substantial complexity to the assembler. I asked for a proper RFC on the x86-64 side: github.com/llvm/llvm-proj… Today they posted one discourse.llvm.org/t/rfc-lightwei…
maskray.me/blog/2026-05-1… Fighting Hyrum's Law in LLVM
lld/ELF coverage in a -fprofile-continuous -DLLVM_BUILD_INSTRUMENTED_COVERAGE=on -DLLVM_TARGETS_TO_BUILD=all build. line and region coverage: 94%. branch coverage: 90% Many uncovered regions are `llvm_unreachable` statements.
Clang source-based code coverage for clang, llc, and lld has seen some regressions since Oct 2024. Two issues: an llvm-cov slowdown (20+ min processing github.com/llvm/llvm-proj…) and a -fcoverage-mapping instrumentation issue (github.com/llvm/llvm-proj…). Fixes are on the way.
GitHub's "Squash and merge" button is very prominent, but the "Requested changes" status is easy to miss. To avoid the careless merges this UI tends to encourage, I'll sometimes proactively dismiss approvals from outside the module on areas where I have ownership.
Request Commit Access github.com/llvm/llvm-proj… 4 Merged Pull Requests Top 3 Reviewers: MaskRay (5), ... Three Meta folks support the request—one of whom has been in the community for a long time and I highly admire. Nevertheless, I declined it. Am I a bad guy? 🦀
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