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

[Florian Hahn via llvm-commits]

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@@ -6771,8 +6776,33 @@ LoopVectorizationCostModel::getInstructionCost(Instruction *I, ElementCount VF,
     // We've proven all lanes safe to speculate, fall through.
     [[fallthrough]];
   case Instruction::Add:
+  case Instruction::Sub: {
+    auto Info = Legal->getHistogramInfo(I);
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fhahn wrote:

AFAICT we are still adding the costs for the load/store replaced by the histogram?

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