[llvm] [RISCV] Fix missing scaling by LMUL in cost model (PR #73342)

[Simeon K via llvm-commits]

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@@ -1154,7 +1157,7 @@ RISCVTTIImpl::getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
     auto LT = getTypeLegalizationCost(RetTy);
     unsigned VPISD = getISDForVPIntrinsicID(ICA.getID());
     if (TLI->isOperationCustom(VPISD, LT.second))
-      return Cost * LT.first;
+      return Cost * LT.first * TLI->getLMULCost(LT.second);
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simeonkr wrote:

Thanks, I think it's correct now.

https://github.com/llvm/llvm-project/pull/73342