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Latest posts
Last updated 7 days ago
lld 23 ELF changes
7 days ago
LLVM 23.1 has been released. As usual, I maintain lld/ELF and asvolunteer...
Remarks on SFrame
12 months ago
SFrame is a new stack walkingformat for userspace profiling, inspired by Linux's...
Stack walking: space and time trade-offs
11 months ago
On most Linux platforms (except AArch32, which uses.ARM.exidx), DWARF .eh_frame is required...
Call relocation types
7 months ago
Most architectures encode direct branch/call instructions with aPC-relative displacement. This post discusses...
Bit-field layout
7 months ago
The C and C++ standards leave nearly every detail to theimplementation. C23...
Fighting Hyrum's Law in LLVM
4 months ago
With a sufficient number of users of an API, it does not...
A deep dive into SmallVector::push_back
3 months ago
tl;dr This blog post describes a recentSmallVector::push_back optimization for approximatelytrivially copyable element...
Optimizing LLVM's bump allocator
3 months ago
BumpPtrAllocator is LLVM's bump allocator (arenaallocator): each allocation bumps a pointer within...
Block frequency
27 days ago
Estimating branchprobabilities says how one branch splits.BlockFrequencyInfo turns those local numbers into...
Estimating branch probabilities
about 1 month ago
LLVM's BranchProbabilityInfo assigns everymulti-successor terminator a probability distribution over itssuccessors. This post...
lld 21 ELF changes
about 1 year ago
LLVM 21.1 have been released. As usual, I maintain lld/ELF and haveadded...
Long branches in compilers, assemblers, and linkers
8 months ago
Branch instructions on most architectures use PC-relative addressingwith a limited range. When...