[llvm] Expanding the Histogram Intrinsic (PR #127399)

[via llvm-commits]

RonDahan101 wrote:


> What will the strategy to lower those intrinsics? Doe the default lowering need updating?
> 
> It would be good to add the intrinsics together with initial lowering as separate patch, including codegen tests.
> 
> Then extend LV to use them, which will likely also need updating to the cost model?.

Hey Florian,

I'm working on out of tree target, so there will not be upstream targets that can lower these intrinsics.
About the cost-model I didn't change anything related to the vectorization of histogram so it uses the same one as before.
I prefer to upstream these changes in case any other will benefit from this histogram variations.  


https://github.com/llvm/llvm-project/pull/127399