AMD Optimizes Bitcoin Mining On R600 LLVM OpenCL
Written by Michael Larabel in AMD on 29 April 2013 at 04:45 PM EDT. 47 Comments
Earlier this month I wrote about Bitcoin Mining coming to the open-source Radeon Linux GPU driver. In the weeks since, Tom Stellard of AMD has made more improvements to the AMD R600 LLVM back-end that benefit the performance of Bitcoin mining.

The OpenCL/GPGPU stack of the open-source Radeon Gallium3D Linux graphics driver still is not as fast or feature-complete as the proprietary AMD Catalyst driver, but it's still being raised. Until earlier this month, the open-source AMD Radeon OpenCL support was only useful for running a few sample OpenCL demos but now the popular "bfgminer" Bitcoin mining application can handle the Gallium3D stack that uses a LLVM back-end for communicating with the Radeon HD 5000 series and beyond.

On Monday afternoon, Tom Stellard post a new set of patches that provide for bfgminer optimizations with the R600 LLVM back-end.

The patches that provide for Bitcoin mining optimizations on the Radeon open-source driver include 64-bit load/store support, a pattern for the SHA-256 Ma function, a change for the BFI_INT instruction, and support for expanding vector or/shl/srl/xor nodes.

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Michael Larabel is the principal author of 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 automated benchmarking software. He can be followed via Twitter or contacted via

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