[llvm] [RISCV][TTI]Use processShuffleMasks for cost estimations/actual per-register shuffles (PR #118103)

[Alexey Bataev via llvm-commits]

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@@ -389,6 +389,105 @@ InstructionCost RISCVTTIImpl::getShuffleCost(TTI::ShuffleKind Kind,
   // give a more accurate cost than falling back to generic scalable codegen.
   // TODO: Each of these cases hints at a modeling gap around scalable vectors.
   if (isa<FixedVectorType>(Tp)) {
+    MVT LegalVT = LT.second;
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alexey-bataev wrote:

Added

https://github.com/llvm/llvm-project/pull/118103