[llvm] [RISCV][GISel] Add FP calling convention support using FPR and GPR registers. (PR #69138)

[Philip Reames via llvm-commits]

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@@ -164,44 +194,101 @@ struct RISCVIncomingValueHandler : public CallLowering::IncomingValueHandler {
 
   void assignValueToReg(Register ValVReg, Register PhysReg,
                         CCValAssign VA) override {
-    // Copy argument received in physical register to desired VReg.
-    MIRBuilder.getMBB().addLiveIn(PhysReg);
-    MIRBuilder.buildCopy(ValVReg, PhysReg);
+    markPhysRegUsed(PhysReg);
+    IncomingValueHandler::assignValueToReg(ValVReg, PhysReg, VA);
   }
 
+  unsigned assignCustomValue(CallLowering::ArgInfo &Arg,
+                             ArrayRef<CCValAssign> VAs,
+                             std::function<void()> *Thunk = nullptr) override {
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preames wrote:

Thunk is never set here?

https://github.com/llvm/llvm-project/pull/69138