hameeza ahmed via llvm-dev
2018-Jan-20 15:47 UTC
[llvm-dev] Polly loop offloading to Accelerator
Hello, i have been working with an accelerator backend. the accelerator has large vector/simd units. i want streaming loops (non-temporal) vectorized present in code to be offloaded to accelerator simd units. i find polly really suitable for this. i am thinking if the generated IR is passed to polly and then it analyzes loop to know it posses no reuse, if such loop is identified accelerator instructions are emitted.. where should i begin from to achieve the goals? please clarify? Thank You Regards -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180120/36911bc7/attachment.html>
Michael Kruse via llvm-dev
2018-Jan-29 15:20 UTC
[llvm-dev] Polly loop offloading to Accelerator
Hi, you could use Polly to generate an AstInfo. With the option -polly-ast-detect-parallel it will mark loops in the generated Ast as "coincident", i.e. parallel and without reuse. If you know the vector width of your accelerator, you can use LoopVectorizationLegality::canVectorize to determine whether you can vectorize it. If your accelerators computational model assumes no loop-carried dependencies, maybe LoopVectorizationLegality can be modified to accept 'infinite' vector width. polly-dev at googlegroups.com would be the mailing list for help specically for Polly. Michael 2018-01-20 9:47 GMT-06:00 hameeza ahmed via llvm-dev <llvm-dev at lists.llvm.org>:> Hello, > > i have been working with an accelerator backend. the accelerator has large > vector/simd units. > > i want streaming loops (non-temporal) vectorized present in code to be > offloaded to accelerator simd units. > > > i find polly really suitable for this. > > i am thinking if the generated IR is passed to polly and then it analyzes > loop to know it posses no reuse, if such loop is identified accelerator > instructions are emitted.. > > where should i begin from to achieve the goals? > > please clarify? > > > Thank You > Regards > > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >
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