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Latest posts
Last updated 9 days ago
Irreducible loops
9 days ago
The dominator tree letsus identify natural loops:a back edge T->H whose head...
Optimizing LLVM's bump allocator
23 days ago
BumpPtrAllocator is LLVM's bump allocator (arenaallocator): each allocation bumps a pointer within...
A deep dive into SmallVector::push_back
24 days ago
SmallVector is LLVM's most-used container, andpush_back its hot operation. For the trivially-copyablespecialization...
Recent LLVM hash table improvements
about 1 month ago
LLVM had several hash tables using quadratic probing with in-bandsentinel keys (empty...
Fighting Hyrum's Law in LLVM
2 months ago
With a sufficient number of users of an API, it does not...
Recent lld/ELF performance improvements
3 months ago
Since the LLVM 22 branch was cut, I've landed a series of...
Bit-field layout
5 months ago
The C and C++ standards leave nearly every detail to theimplementation. C23...
Call relocation types
5 months ago
Most architectures encode branch/call instructions with a PC-relativedisplacement. Some architectures use two...
lld 22 ELF changes
6 months ago
LLVM 22.1 will be released soon. As usual, I maintain lld/ELF andhave...
Long branches in compilers, assemblers, and linkers
6 months ago
Branch instructions on most architectures use PC-relative addressingwith a limited range. When...
Handling long branches
6 months ago
Branch instructions on most architectures use PC-relative addressingwith a limited range. When...