Adding a new target/object backend to LLVM JITLink
Motivation For the last year, I have been contributing to LLVM JITLink. This post aims to doubly serve as a summary of my work and documentation for future contributors looking to add a new target/object backend to LLVM JITLink. We will start by establishing some background and definitions of relevant concepts. Then, we will talk about what the project actually entailed. Finally, we will go over t
A brave new world: building glibc with LLVM
Times are changing: LLVM has become more than a spare to GCC, such that glibc - the last big GCC bastion, is now working towards supporting LLVM as a first-class citizen. This post is a sequel to last year's A tale of two toolchains and glibc. Unfamiliar readers are recommended to read the previous post for a better understanding of the progress being discussed here. It has been more than a year,
This year in LLVM (2022)
Towards the end of last year, I switched from working on PHP at JetBrains, to working on LLVM at Red Hat. While it was already under discussion beforehand, this catalyzed the creation of the PHP foundation, which now pays multiple people to work on PHP. Special thanks for this go to Roman Pronskiy, who did most of the work to set up the foundation, and keeps it running ever since. Also a shout-out
GitHub - exaloop/codon: A high-performance, zero-overhead, extensible Python compiler using LLVM
Codon is a high-performance Python implementation that compiles to native machine code without any runtime overhead. Typical speedups over vanilla Python are on the order of 10-100x or more, on a single thread. Codon's performance is typically on par with (and sometimes better than) that of C/C++. Unlike Python, Codon supports native multithreading, which can lead to speedups many times higher sti
Polly - Polyhedral optimizations for LLVM
AST Generation Paper published in TOPLAS The July issue of TOPLAS contains a 50 page discussion of the AST generation techniques used in Polly. This discussion gives not only an in-depth description of how we (re)generate an imperative AST from our polyhedral based mathematical program description, but also gives interesting insights about: Schedule trees: A tree-based mathematical program descrip
Welcome to Flang’s documentation — The Flang Compiler
Welcome to Flang’s documentation¶ Flang is LLVM’s Fortran frontend that can be found here. It is often referred to as “LLVM Flang” to differentiate itself from “Classic Flang” - these are two separate and independent Fortran compilers. LLVM Flang is under active development. While it is capable of generating executables for a number of examples, some functionality is still missing. See Getting Inv
Changing std::sort at Google’s Scale and Beyond
TL;DR; We are changing std::sort in LLVM’s libcxx. That’s a long story of what it took us to get there and all possible consequences, bugs you might encounter with examples from open source. We provide some benchmarks, perspective, why we did this in the first place and what it cost us with exciting ideas from Hyrum’s Law to reinforcement learning. All changes went into open source and thus I can
Lanai, the mystery CPU architecture in LLVM | q3k writes
Lanai, the mystery CPU architecture in LLVM. Disclaimer: I have had access to some confidential information about some of the matter discussed in this page. However, everything written here is derived form publicly available sources, and references to these sources are also provided. Some of my recent long-term projects revolve around a little known CPU architecture called 'Lanai'. Unsurprisingly,
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Mapping High Level Constructs to LLVM IR — Mapping High Level Constructs to LLVM IR documentation
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