1 files changed, 16 insertions, 3 deletions
diff --git a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUInstPrinter.cpp b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUInstPrinter.cpp
index d3b5718..e82f998 100644
--- a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUInstPrinter.cpp
+++ b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUInstPrinter.cpp
@@ -788,9 +788,11 @@ void AMDGPUInstPrinter::printRegularOperand(const MCInst *MI, unsigned OpNo,
     // Check if operand register class contains register used.
     // Intention: print disassembler message when invalid code is decoded,
     // for example sgpr register used in VReg or VISrc(VReg or imm) operand.
-    int RCID = Desc.operands()[OpNo].RegClass;
+    const MCOperandInfo &OpInfo = Desc.operands()[OpNo];
+    int16_t RCID = MII.getOpRegClassID(
+        OpInfo, STI.getHwMode(MCSubtargetInfo::HwMode_RegInfo));
     if (RCID != -1) {
-      const MCRegisterClass RC = MRI.getRegClass(RCID);
+      const MCRegisterClass &RC = MRI.getRegClass(RCID);
       auto Reg = mc2PseudoReg(Op.getReg());
       if (!RC.contains(Reg) && !isInlineValue(Reg)) {
         O << "/*Invalid register, operand has \'" << MRI.getRegClassName(&RC)
@@ -1025,7 +1027,7 @@ void AMDGPUInstPrinter::printDPPCtrl(const MCInst *MI, unsigned OpNo,
   const MCInstrDesc &Desc = MII.get(MI->getOpcode());
 
   if (!AMDGPU::isLegalDPALU_DPPControl(STI, Imm) &&
-      AMDGPU::isDPALU_DPP(Desc, STI)) {
+      AMDGPU::isDPALU_DPP(Desc, MII, STI)) {
     O << " /* DP ALU dpp only supports "
       << (isGFX12(STI) ? "row_share" : "row_newbcast") << " */";
     return;
@@ -1280,6 +1282,17 @@ void AMDGPUInstPrinter::printPackedModifier(const MCInst *MI,
         (ModIdx != -1) ? MI->getOperand(ModIdx).getImm() : DefaultValue;
   }
 
+  // Some instructions, e.g. v_interp_p2_f16 in GFX9, have src0, src2, but no
+  // src1.
+  if (NumOps == 1 && AMDGPU::hasNamedOperand(Opc, AMDGPU::OpName::src2) &&
+      !AMDGPU::hasNamedOperand(Opc, AMDGPU::OpName::src1)) {
+    Ops[NumOps++] = DefaultValue; // Set src1_modifiers to default.
+    int Mod2Idx =
+        AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2_modifiers);
+    assert(Mod2Idx != -1);
+    Ops[NumOps++] = MI->getOperand(Mod2Idx).getImm();
+  }
+
   const bool HasDst =
       (AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst) != -1) ||
       (AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::sdst) != -1);