[llvm] [RISCV] RISCV vector calling convention (2/2) (PR #79096)

[Brandon Wu via llvm-commits]

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@@ -20543,6 +20531,121 @@ unsigned RISCVTargetLowering::getMinimumJumpTableEntries() const {
   return Subtarget.getMinimumJumpTableEntries();
 }
 
+void RVVArgDispatcher::constructArgInfos(Type *Ty) {
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4vtomat wrote:

It's a bit different since `splitToValueTypes` uses `ComputeValueVTs` to get value type(s) and it can't handle **vector tuple type**. Same situation in `SelectionDAGISel::LowerArguments`, they both use `ComputeValueVTs` for getting value types, that's why `RVVArgDispatcher` comes to help.

https://github.com/llvm/llvm-project/pull/79096