LLVM Architecture: Deep Dive into Frontend Processing and Optimization Passes
The LLVM compiler infrastructure is built around a central Intermediate Representation (IR). While the IR serves as the common language throughout the compilation lifecycle, the process involves various data structures and specialized stages. This article explores the mechanics of the LLVM frontend and its sophisticated optimization layer.
The ...
Posted on Sun, 12 Jul 2026 16:58:20 +0000 by monloi
LLVM RAGreedy Register Allocator Internals: Allocation, Eviction, Splitting, and Spilling Mechanics
Core Core Data Structures
Structure
Purpose
LiveIntervals
Stores live ranges for every virtual register
LiveRegMatrix
Tracks physical-to-virtual mappings and interference
PriorityQueue
Heap-based queue ordered by Priority
VirtRegMap
Final virtual → physical assignment
EvictAdvisor
Decides whether evicting an existing allocation i ...
Posted on Wed, 13 May 2026 03:59:11 +0000 by dnice