[RISCV][NFC] Move getRVVMCOpcode to RISCVInstrInfo (#70637)

To simplify more code.

Author: wangpc-pp

llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp

@@ -2841,10 +2841,9 @@ bool RISCVDAGToDAGISel::selectSHXADD_UWOp(SDValue N, unsigned ShAmt,
 static bool vectorPseudoHasAllNBitUsers(SDNode *User, unsigned UserOpNo,
                                         unsigned Bits,
                                         const TargetInstrInfo *TII) {
-  const RISCVVPseudosTable::PseudoInfo *PseudoInfo =
-      RISCVVPseudosTable::getPseudoInfo(User->getMachineOpcode());
+  unsigned MCOpcode = RISCV::getRVVMCOpcode(User->getMachineOpcode());
 
-  if (!PseudoInfo)
+  if (!MCOpcode)
     return false;
 
   const MCInstrDesc &MCID = TII->get(User->getMachineOpcode());
@@ -2865,7 +2864,7 @@ static bool vectorPseudoHasAllNBitUsers(SDNode *User, unsigned UserOpNo,
     return false;
 
   auto NumDemandedBits =
-      RISCV::getVectorLowDemandedScalarBits(PseudoInfo->BaseInstr, Log2SEW);
+      RISCV::getVectorLowDemandedScalarBits(MCOpcode, Log2SEW);
   return NumDemandedBits && Bits >= *NumDemandedBits;
 }
 
@@ -3404,21 +3403,11 @@ bool RISCVDAGToDAGISel::doPeepholeMaskedRVV(MachineSDNode *N) {
 }
 
 static bool IsVMerge(SDNode *N) {
-  unsigned Opc = N->getMachineOpcode();
-  return Opc == RISCV::PseudoVMERGE_VVM_MF8 ||
-         Opc == RISCV::PseudoVMERGE_VVM_MF4 ||
-         Opc == RISCV::PseudoVMERGE_VVM_MF2 ||
-         Opc == RISCV::PseudoVMERGE_VVM_M1 ||
-         Opc == RISCV::PseudoVMERGE_VVM_M2 ||
-         Opc == RISCV::PseudoVMERGE_VVM_M4 || Opc == RISCV::PseudoVMERGE_VVM_M8;
+  return RISCV::getRVVMCOpcode(N->getMachineOpcode()) == RISCV::VMERGE_VVM;
 }
 
 static bool IsVMv(SDNode *N) {
-  unsigned Opc = N->getMachineOpcode();
-  return Opc == RISCV::PseudoVMV_V_V_MF8 || Opc == RISCV::PseudoVMV_V_V_MF4 ||
-         Opc == RISCV::PseudoVMV_V_V_MF2 || Opc == RISCV::PseudoVMV_V_V_M1 ||
-         Opc == RISCV::PseudoVMV_V_V_M2 || Opc == RISCV::PseudoVMV_V_V_M4 ||
-         Opc == RISCV::PseudoVMV_V_V_M8;
+  return RISCV::getRVVMCOpcode(N->getMachineOpcode()) == RISCV::VMV_V_V;
 }
 
 static unsigned GetVMSetForLMul(RISCVII::VLMUL LMUL) {

llvm/lib/Target/RISCV/RISCVInsertVSETVLI.cpp

@@ -67,16 +67,8 @@ static bool isVLPreservingConfig(const MachineInstr &MI) {
   return RISCV::X0 == MI.getOperand(0).getReg();
 }
 
-static uint16_t getRVVMCOpcode(uint16_t RVVPseudoOpcode) {
-  const RISCVVPseudosTable::PseudoInfo *RVV =
-      RISCVVPseudosTable::getPseudoInfo(RVVPseudoOpcode);
-  if (!RVV)
-    return 0;
-  return RVV->BaseInstr;
-}
-
 static bool isFloatScalarMoveOrScalarSplatInstr(const MachineInstr &MI) {
-  switch (getRVVMCOpcode(MI.getOpcode())) {
+  switch (RISCV::getRVVMCOpcode(MI.getOpcode())) {
   default:
     return false;
   case RISCV::VFMV_S_F:
@@ -86,7 +78,7 @@ static bool isFloatScalarMoveOrScalarSplatInstr(const MachineInstr &MI) {
 }
 
 static bool isScalarExtractInstr(const MachineInstr &MI) {
-  switch (getRVVMCOpcode(MI.getOpcode())) {
+  switch (RISCV::getRVVMCOpcode(MI.getOpcode())) {
   default:
     return false;
   case RISCV::VMV_X_S:
@@ -96,7 +88,7 @@ static bool isScalarExtractInstr(const MachineInstr &MI) {
 }
 
 static bool isScalarInsertInstr(const MachineInstr &MI) {
-  switch (getRVVMCOpcode(MI.getOpcode())) {
+  switch (RISCV::getRVVMCOpcode(MI.getOpcode())) {
   default:
     return false;
   case RISCV::VMV_S_X:
@@ -106,7 +98,7 @@ static bool isScalarInsertInstr(const MachineInstr &MI) {
 }
 
 static bool isScalarSplatInstr(const MachineInstr &MI) {
-  switch (getRVVMCOpcode(MI.getOpcode())) {
+  switch (RISCV::getRVVMCOpcode(MI.getOpcode())) {
   default:
     return false;
   case RISCV::VMV_V_I:
@@ -117,7 +109,7 @@ static bool isScalarSplatInstr(const MachineInstr &MI) {
 }
 
 static bool isVSlideInstr(const MachineInstr &MI) {
-  switch (getRVVMCOpcode(MI.getOpcode())) {
+  switch (RISCV::getRVVMCOpcode(MI.getOpcode())) {
   default:
     return false;
   case RISCV::VSLIDEDOWN_VX:
@@ -131,7 +123,7 @@ static bool isVSlideInstr(const MachineInstr &MI) {
 /// Get the EEW for a load or store instruction.  Return std::nullopt if MI is
 /// not a load or store which ignores SEW.
 static std::optional<unsigned> getEEWForLoadStore(const MachineInstr &MI) {
-  switch (getRVVMCOpcode(MI.getOpcode())) {
+  switch (RISCV::getRVVMCOpcode(MI.getOpcode())) {
   default:
     return std::nullopt;
   case RISCV::VLE8_V:

llvm/lib/Target/RISCV/RISCVInstrInfo.cpp

@@ -3103,3 +3103,11 @@ RISCV::getVectorLowDemandedScalarBits(uint16_t Opcode, unsigned Log2SEW) {
     return 1U << Log2SEW;
   }
 }
+
+unsigned RISCV::getRVVMCOpcode(unsigned RVVPseudoOpcode) {
+  const RISCVVPseudosTable::PseudoInfo *RVV =
+      RISCVVPseudosTable::getPseudoInfo(RVVPseudoOpcode);
+  if (!RVV)
+    return 0;
+  return RVV->BaseInstr;
+}

llvm/lib/Target/RISCV/RISCVInstrInfo.h

@@ -283,6 +283,9 @@ bool hasEqualFRM(const MachineInstr &MI1, const MachineInstr &MI2);
 std::optional<unsigned> getVectorLowDemandedScalarBits(uint16_t Opcode,
                                                        unsigned Log2SEW);
 
+// Returns the MC opcode of RVV pseudo instruction.
+unsigned getRVVMCOpcode(unsigned RVVPseudoOpcode);
+
 // Special immediate for AVL operand of V pseudo instructions to indicate VLMax.
 static constexpr int64_t VLMaxSentinel = -1LL;
 

llvm/lib/Target/RISCV/RISCVOptWInstrs.cpp

@@ -84,10 +84,9 @@ FunctionPass *llvm::createRISCVOptWInstrsPass() {
 static bool vectorPseudoHasAllNBitUsers(const MachineOperand &UserOp,
                                         unsigned Bits) {
   const MachineInstr &MI = *UserOp.getParent();
-  const RISCVVPseudosTable::PseudoInfo *PseudoInfo =
-      RISCVVPseudosTable::getPseudoInfo(MI.getOpcode());
+  unsigned MCOpcode = RISCV::getRVVMCOpcode(MI.getOpcode());
 
-  if (!PseudoInfo)
+  if (!MCOpcode)
     return false;
 
   const MCInstrDesc &MCID = MI.getDesc();
@@ -101,7 +100,7 @@ static bool vectorPseudoHasAllNBitUsers(const MachineOperand &UserOp,
     return false;
 
   auto NumDemandedBits =
-      RISCV::getVectorLowDemandedScalarBits(PseudoInfo->BaseInstr, Log2SEW);
+      RISCV::getVectorLowDemandedScalarBits(MCOpcode, Log2SEW);
   return NumDemandedBits && Bits >= *NumDemandedBits;
 }