MaskRay

mold and wild enable several tricks by default that other linkersdon't do.

LLVM 23.1 has been released.

Estimating branchprobabilities says how one branch splits.BlockFrequencyInfo turns those local numbers into per-blockfrequencies, which nearly every profitability decision in LLVM ends upreading.

LLVM's BranchProbabilityInfo assigns everymulti-successor terminator a probability distribution over itssuccessors.

The dominator tree lets usidentify natural loops: a back edgeT->H whose head H dominates its tailT defines a loop with the single entry H.

BumpPtrAllocator is LLVM's bump allocator (arenaallocator): each allocation bumps a pointer within a slab, andeverything is freed at once when the allocator dies.

tl;dr This blog post describes a recentSmallVector::push_back optimization for approximatelytrivially copyable element types.

LLVM has several hash tables.

With a sufficient number of users of an API, it does not matterwhat you promise in the contract: all observable behaviors of yoursystem will be depended on by somebody. — Hyrum's Law In a compiler, the most common form of Hyrum's Law is dependence onunspe…

Updated in 2026-05.

The C and C++ standards leave nearly every detail to theimplementation.

Most architectures encode direct branch/call instructions with aPC-relative displacement.

For those unfamiliar, lld is theLLVM linker, supporting PE/COFF, ELF, Mach-O, and WebAssembly ports.These object file formats differ significantly, and each port mustfollow the conventions of the platform's system linker.

Branch instructions on most architectures use PC-relative addressingwith a limited range.

I've created pr-shadow with vibecoding, a tool that maintains a shadow branch for GitHub pull requests(PR) that never requires force-pushing.

TODO 一如既往，主要在工具链领域耕耘。

tl;dr: Weak AVL trees are replacements for AVL trees and red-blacktrees.

周末从旧金山湾南部去Sacramento参观。

On most Linux platforms (except AArch32, which uses.ARM.exidx), DWARF .eh_frame is required forC++ exception handlingand stack unwinding to restorecallee-saved registers.

SFrame is a new stack walkingformat for userspace profiling, inspired by Linux's in-kernel ORC unwindformat.

LLVM 21.1 have been released.

tl;dr https://gist.github.com/MaskRay/74cdaa83c1f44ee105fcebcdff0ba9a7is a single-file Ruby program that downloads and compiles multiplecompression utilities, then benchmarks their compression anddecompression performance on a specified input file, finally