[llvm-dev] Can I control HSA config generated by AMDGPU backend? (original) (raw)

Changdao Dong via llvm-dev llvm-dev at lists.llvm.org
Wed Sep 5 23:58:21 PDT 2018

Matt,

Attached are the two assembly code for kernel "search2", one is from amdgpu pro online compiler, one is from llvm-roc-1.6.x. It will be great if you can take a look and see how to improve the llvm one. In case you missed: The target algorithm is lyra2 and the target kernel is "search2" in https://github.com/fancyIX/sgminer-phi2-branch/blob/master/kernel/phi2.cl. The detail is implemented in https://github.com/fancyIX/sgminer-phi2-branch/blob/master/kernel/lyra2mdz.cl

Thanks, Changdao

On Wed, Sep 5, 2018 at 12:26 PM Changdao Dong <dongchangdao at gmail.com> wrote:

The target algorithm is lyra2 and the target kernel is "search2" in https://github.com/fancyIX/sgminer-phi2-branch/blob/master/kernel/phi2.cl. The detail is implemented in https://github.com/fancyIX/sgminer-phi2-branch/blob/master/kernel/lyra2mdz.cl If you have time to take a look at the assembly, I can upload them later today.

Thanks, Changdao On Wed, Sep 5, 2018 at 11:32 AM Matt Arsenault <arsenm2 at gmail.com> wrote:

On Sep 5, 2018, at 23:17, Changdao Dong via llvm-dev <_ _llvm-dev at lists.llvm.org> wrote: Finally I kind of modified llvm to generate assembly that can run on AMDGPU pro drivers. One problem is the performance of the code generated by llvm is about 10% slower than amdgpu's online compiler. Anything I can tune _the performance up the performance of llvm?_ This is very dependent on the case you are looking at, so without a specific example or ISA comparison between the compilers there’s no guessing -Matt -- DONG, Changdao MP: 1-412-551-2330 dongchangdao at gmail.com <cddong at cmu.edu>

-- DONG, Changdao

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