Alex Bradbury | Igalia - Open Source Consultancy and Development

Alex Bradbury

Alex Bradbury

At Igalia since March 2022.

Cambridge (UK)

POSTS

Feb 27, 2025

ccache for LLVM builds across multiple directories

Problem description If you’re regularly rebuilding a large project like LLVM, you almost certainly want to be using ccache. Incremental builds are helpful, but it’s quite common to be swapping...

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Dec 9, 2024

Directly committing files to a separate git branch

Suppose you have some files you want to directly commit to a branch in your current git repository, doing so without perturbing your current branch. Why would you want to...

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Dec 3, 2024

Rootless cross-architecture debootstrap

As usual, let’s start by introducing the problem. Suppose you want to produce either a Debian-derived sysroot for cross-compilation, something you can chroot into, or even a full image you...

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Oct 15, 2024

Accessing a cross-compiled build tree from qemu-system

I’m cross-compiling a large codebase (LLVM and sub-projects such as Clang) and want to access the full tree - the source and the build artifacts from under qemu. This post...

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Media

RISC-Y Business

Jan 31, 2025

RISC-V LLVM State of the Union

Dec 23, 2024

Toots

Turns out if you generate blocks with 100s of millions of ops in MLIR you have a bad time https://discourse.llvm.org/t/rfc-operations-orderindex-overflow-and-mitigations/85541...

My total rewrite of the instructions on cross-compiling Clang/LLVM for Linux using Clang/LLVM for Linux has now landed.If you want...

We need an equivalent “which RISC-V extension are you?” quiz https://jamesg.blog/2025/02/13/html-quiz

Some notes on ccache+LLVM. Summary: if you do a lot of builds across different checkouts/worktrees/builddirs, be sure to set the...

Commits

[LLVM] [RISCV][MC] Enable printing of zext.b alias (#133502)

[LLVM] [RISCV] Add shift-add (SH1ADD, ...) to isCopyInstrImpl (#133443)

[LLVM] [RISCV] Add OR/XOR/SUB to RISCVInstrInfo::isCopyInstrImpl (#132002)

[LLVM] [PreISelIntrinsicLowering][test] Add coverage for @llvm.experimental.…