[llvm] [TRI][RISCV] Add methods to get common register class of two registers (PR #118435)

[Pengcheng Wang via llvm-commits]

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@@ -562,17 +562,11 @@ void RISCVInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
   }
 
   // VR->VR copies.
-  static const TargetRegisterClass *RVVRegClasses[] = {
-      &RISCV::VRRegClass,     &RISCV::VRM2RegClass,   &RISCV::VRM4RegClass,
-      &RISCV::VRM8RegClass,   &RISCV::VRN2M1RegClass, &RISCV::VRN2M2RegClass,
-      &RISCV::VRN2M4RegClass, &RISCV::VRN3M1RegClass, &RISCV::VRN3M2RegClass,
-      &RISCV::VRN4M1RegClass, &RISCV::VRN4M2RegClass, &RISCV::VRN5M1RegClass,
-      &RISCV::VRN6M1RegClass, &RISCV::VRN7M1RegClass, &RISCV::VRN8M1RegClass};
-  for (const auto &RegClass : RVVRegClasses) {
-    if (RegClass->contains(DstReg, SrcReg)) {
-      copyPhysRegVector(MBB, MBBI, DL, DstReg, SrcReg, KillSrc, RegClass);
-      return;
-    }
+  const TargetRegisterClass *RegClass =
+      TRI->getCommonMinimalPhysRegClass(SrcReg, DstReg);
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wangpc-pp wrote:

Use TSFlags now.

https://github.com/llvm/llvm-project/pull/118435