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Running The RadeonSI NIR Back-End With Mesa 19.1 Git

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Graphics/Benchmarks

It's been a number of months since last trying the RadeonSI NIR back-end, which is being developed as part of the OpenGL 4.6 SPIR-V bits for this AMD OpenGL driver, but eventually RadeonSI may end up switching from TGSI to NIR by default. Given the time since we last tried it out and the increasing popularity of NIR, this weekend I did some fresh tests of the NIR back-end with a Radeon Vega graphics card.

The RadeonSI NIR support isn't enabled by default but requires setting the R600_DEBUG=nir environment variable for activating. They have been pursuing this support to re-use existing code as part of the long-awaited OpenGL 4.6 SPIR-V ingestion support, which is still ongoing.

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