[llvm] [LV] Autovectorization for the all-in-one histogram intrinsic (PR #91458)

[Florian Hahn via llvm-commits]

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@@ -1939,6 +1942,7 @@ class TargetTransformInfo::Concept {
                                               unsigned *Fast) = 0;
   virtual PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) = 0;
   virtual bool haveFastSqrt(Type *Ty) = 0;
+  virtual InstructionCost getHistogramCost(Type *Ty) = 0;
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fhahn wrote:

Do we need a new hook for that or would it be sufficient to implement this in `getIntrinsicInstrCost`? That way the cost changes could also be split off and tested separately.

https://github.com/llvm/llvm-project/pull/91458