Marek Has Been Taking To AMDGPU LLVM Optimizations
Written by Michael Larabel in Radeon on 13 November 2017 at 08:00 PM EST. 26 Comments
RADEON --
Well known AMD open-source driver developer Marek Olšák has ruthlessly been optimizing the Radeon Mesa driver stack for years. With RadeonSI getting fine-tuned and already largely outperforming the AMDGPU-PRO OpenGL driver and most of the big ticket improvements complete, it appears his latest focus is on further optimizing the AMDGPU LLVM compiler back-end.

This AMDGPU LLVM compiler back-end is what's used by RadeonSI but is also leveraged by the RADV Vulkan driver, among other potential use-cases. Lately Marek has been filing patches for optimizing the instructions generated during the shader compilation process.

Some recent AMDGPU LLVM patch examples include a -5.3% code size in affected shaders, -9.9% code size decrease in affected shaders, and other improvements.

His latest LLVM activity can be found here and here.

These compiler back-end improvements are queuing in LLVM 6.0, which will be released as stable early next year, but some packages like the Padoka PPA do a good job already following SVN/Git for incorporating these compiler back-end optimizations.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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