| Bug ID | 99850 |
|---|---|
| Summary | Tessellation bug on Carrizo |
| Product | Mesa |
| Version | unspecified |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | Drivers/Gallium/radeonsi |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | tom.stdenis@amd.com |
| QA Contact | dri-devel@lists.freedesktop.org |
Created attachment 129692 [details] carrizo run with HEAD Tessellation is broken on Carrizo (A12-9800) hardware and apparently has been for a while. The offending commit is commit a4e2146a9d24592ed7e3bf778e3c21c6cfb89330 Author: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Date: Mon May 2 14:55:52 2016 +0200 radeonsi: Use buffer loads and stores for passing data from TCS to TES. We always try to use 4-component loads, as LLVM does not combine loads and they bypass the L1 cache. We can't use a similar strategy for stores and this is especially notable with the tess factors, as they are often set with separate MOV's per component in the TGSI. We keep storing to LDS and the LDS space, so we can load the outputs later, either due to the shader, of for wrting the tess factors. Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com> I found it via running Unigine-Heaven with tessellation enabled. The bug doesn't occur on other VI hardware (Polaris10, FIJI). I can confirm that the HEAD~ commit leads to spec/arb_tessellation_shader/* tests (in piglit) passing compared to running with HEAD.
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