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An Important Radeon R600 Change In LLVM 3.4

Compiler

Published on 07 June 2013 02:24 AM EDT
Written by Michael Larabel in Compiler
8 Comments

While LLVM 3.3 hasn't even been released yet, there's already an important change found in LLVM 3.4 for Radeon R600 GPU users.

The Radeon R600 LLVM back-end, which is used by the Radeon Gallium3D driver for Compute/OpenCL support and optionally for shader compilation, was merged for LLVM 3.3. While it was merged for LLVM 3.3 and has matured quite a bit, it remains an "experimental" back-end for the imminent LLVM release.

With LLVM 3.4, the R600 back-end is no longer deemed experimental. The R600 back-end in the LLVM 3.3 release requires the --enable-experimental-targets=R600 compiler switch, but per early LLVM 3.4 notes, "The R600 backend is not marked experimental anymore and is built by default."

Beyond this fundamental change, the R600 back-end in LLVM 3.4 has already picked up numerous Radeon improvements in the weeks since LLVM 3.3 was branched. For end-users, unfortunately the LLVM 3.4 release will likely not be here until around year's end.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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