Bug 78163

Summary: xpmclminer with multiprecision math return wrong results on Turks OpenCL
Product: Mesa Reporter: Alexey Shvetsov <alexxy>
Component: Drivers/Gallium/r600Assignee: Tom Stellard <tstellar>
Status: RESOLVED MOVED QA Contact:
Severity: normal    
Priority: medium    
Version: git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Bug Depends on:    
Bug Blocks: 99553    

Description Alexey Shvetsov 2014-05-01 17:19:03 UTC 
Opencl app that uses multiprecision math gives wrong results

App is https://github.com/eXtremal-ik7/xpmminer


$ ./xpmclminer -b --opencl-platform Mesa
OpenCL platform available: Mesa
8 warnings generated.
8 warnings generated.
[0] AMD TURKS; 1 compute units
[1] AMD TURKS; 1 compute units
 * GPU 1 benchmark start:
Multiply 256 bits CPU time: 4.868, GPU time: 4.131 (1.178 times faster)
element index: 0
gmp: 79016B22 1C710C4A DF86F5C0 18E693EF D677434D 28B50A0A 4A2F8F5E 6FF1E1A6 C17B67E2 77B8CB65 8BA0DF48 3CD297F7 AD74948C 6B99D76B 8A81F331 DF8A45CB 8869E036 825665FF 9505CD30 543C80C6 96E3B1A5 72CE6A4A CEA9324B 7C37E23C 
gpu: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
results differ!
Multiply 384 bits CPU time: 9.280, GPU time: 15.885 (0.584 times faster)
Comment 1 GitLab Migration User 2019-09-18 19:16:10 UTC 
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

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