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

[Craig Topper via llvm-commits]

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@@ -1417,10 +1418,10 @@ InstructionCost RISCVTTIImpl::getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
         // vmandn.mm v8, v8, v9
         // vmand.mm v9, v0, v9
         // vmor.mm v0, v9, v8
-        return LT.first * 3;
+        return LT.first * TLI->getLMULCost(LT.second) * 3;
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topperc wrote:

These are mask instructions they don't scale with LMUL. They are at most VLEN bits wide

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