llvm dev - Jul 2018 - KNL Vectorization with larger vector width

Hello,

If we pass march=knl, the llvm vectorizer (O3) generates max 16xi32 vector
width instruction and 8xi32 or 4xi32 in recursive manner.

I am working on a target with larger vector widths like 32,64...
Now how to enable the vectorizer (O3) to automatically generate larger
vector size instructions recursively by specifying the new target. Which
files have the code for this?


Please help

Thank You
Regards
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On 07/12/2018 02:32 PM, hameeza ahmed via llvm-dev
wrote:
> Hello,
>
> If we pass march=knl, the llvm vectorizer (O3) generates max 16xi32
> vector width instruction and 8xi32 or 4xi32 in recursive manner.
>
> I am working on a target with larger vector widths like 32,64...
> Now how to enable the vectorizer (O3) to automatically generate larger
> vector size instructions recursively by specifying the new target.
> Which files have the code for this?
I believe that the thing that you're trying to affect is this:
> LoopVectorizationCostModel::computeFeasibleMaxVF(bool OptForSize,
>                                                  unsigned
> ConstTripCount) {
> ...
>   unsigned WidestRegister = TTI.getRegisterBitWidth(true);
and so your target's TargetTransformInfo class should return an
appropriate value from getRegisterBitWidth.

 -Hal
>
>
> Please help
>
> Thank You
> Regards
>
>
>
>
> _______________________________________________
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> llvm-dev at lists.llvm.org
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-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory

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