[llvm] [feature][riscv] handle target address calculation in llvm-objdump disassembly for riscv (PR #109914)

[Craig Topper via llvm-commits]

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@@ -178,21 +180,35 @@ class RISCVMCInstrAnalysis : public MCInstrAnalysis {
     }
 
     switch (Inst.getOpcode()) {
-    default: {
-      // Clear the state of all defined registers for instructions that we don't
-      // explicitly support.
-      auto NumDefs = Info->get(Inst.getOpcode()).getNumDefs();
-      for (unsigned I = 0; I < NumDefs; ++I) {
-        auto DefReg = Inst.getOperand(I).getReg();
-        if (isGPR(DefReg))
-          setGPRState(DefReg, std::nullopt);
+      case RISCV::LUI: {
+        setGPRState(Inst.getOperand(0).getReg(), 
+                    SignExtend64<32>(Inst.getOperand(1).getImm() << 12));
+        break;
+      }
+      case RISCV::C_LUI: {
+        MCRegister Reg = Inst.getOperand(0).getReg();
+        if (Reg == RISCV::X2)
+          break;
+        setGPRState(Reg, SignExtend64<18>(Inst.getOperand(1).getImm() << 12));
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topperc wrote:

I think c.lui immediate is always in the range [0xfffe0, 0xfffff] or [1, 31] so SignExtend<32> like RISCV::LUI should work.

https://github.com/llvm/llvm-project/pull/109914