llvm dev - Jan 2018 - 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
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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
>