[X86][NFC] Use mnemonic tables in validateInstruction 4/4

[Amir]

Summary

Group switch cases by opcode:

• VGATHERDPD
• VGATHERDPS
• VGATHERQPD
• VGATHERQPS
• VPGATHERDD
• VPGATHERDQ
• VPGATHERQD
• VPGATHERQQ

Distinguish masked vs non-masked forms by EVEX encoding.

[craig.topper]

llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp

3839

Looking at the later uses, should this be uint64_t TSFlags = MII.get(Opcode).TSFlags;? It doesn't look like any other fields are used.

[Amir]

TSFlags

[Amir]

llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp

3839

Agree.

[craig.topper]

LGTM

[Amir]

clang-format

[skan]

LGTM

llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp

bool X86AsmParser::processInstruction(MCInst &Inst, const OperandVector &Ops) {
   }
   }
 }
 
 bool X86AsmParser::validateInstruction(MCInst &Inst, const OperandVector &Ops) {
   using namespace X86;
   const MCRegisterInfo *MRI = getContext().getRegisterInfo();
   unsigned Opcode = Inst.getOpcode();
+  uint64_t TSFlags = MII.get(Opcode).TSFlags;
   if (isVFCMADDCPH(Opcode) || isVFCMADDCSH(Opcode) || isVFMADDCPH(Opcode) ||
       isVFMADDCSH(Opcode)) {
     unsigned Dest = Inst.getOperand(0).getReg();
     for (unsigned i = 2; i < Inst.getNumOperands(); i++)
       if (Inst.getOperand(i).isReg() && Dest == Inst.getOperand(i).getReg())
         return Warning(Ops[0]->getStartLoc(), "Destination register should be "
                                               "distinct from source registers");
   } else if (isVFCMULCPH(Opcode) || isVFCMULCSH(Opcode) || isVFMULCPH(Opcode) ||
if (Src2Enc % 4 != 0) {
       unsigned GroupStart = (Src2Enc / 4) * 4;
       unsigned GroupEnd = GroupStart + 3;
       return Warning(Ops[0]->getStartLoc(),
                      "source register '" + RegName + "' implicitly denotes '" +
                      RegName.take_front(3) + Twine(GroupStart) + "' to '" +
                      RegName.take_front(3) + Twine(GroupEnd) +
                      "' source group");
     }
-  }
-
-  switch (Inst.getOpcode()) {
-  case X86::VGATHERDPDYrm:
-  case X86::VGATHERDPDrm:
-  case X86::VGATHERDPSYrm:
-  case X86::VGATHERDPSrm:
-  case X86::VGATHERQPDYrm:
-  case X86::VGATHERQPDrm:
-  case X86::VGATHERQPSYrm:
-  case X86::VGATHERQPSrm:
-  case X86::VPGATHERDDYrm:
-  case X86::VPGATHERDDrm:
-  case X86::VPGATHERDQYrm:
-  case X86::VPGATHERDQrm:
-  case X86::VPGATHERQDYrm:
-  case X86::VPGATHERQDrm:
-  case X86::VPGATHERQQYrm:
-  case X86::VPGATHERQQrm: {
+  } else if (isVGATHERDPD(Opcode) || isVGATHERDPS(Opcode) ||
+             isVGATHERQPD(Opcode) || isVGATHERQPS(Opcode) ||
+             isVPGATHERDD(Opcode) || isVPGATHERDQ(Opcode) ||
+             isVPGATHERQD(Opcode) || isVPGATHERQQ(Opcode)) {
+    bool HasEVEX = (TSFlags & X86II::EncodingMask) == X86II::EVEX;
+    if (HasEVEX) {
+      unsigned Dest = MRI->getEncodingValue(Inst.getOperand(0).getReg());
+      unsigned Index = MRI->getEncodingValue(
+          Inst.getOperand(4 + X86::AddrIndexReg).getReg());
+      if (Dest == Index)
+        return Warning(Ops[0]->getStartLoc(), "index and destination registers "
+                                              "should be distinct");
+    } else {
       unsigned Dest = MRI->getEncodingValue(Inst.getOperand(0).getReg());
       unsigned Mask = MRI->getEncodingValue(Inst.getOperand(1).getReg());
       unsigned Index =
         MRI->getEncodingValue(Inst.getOperand(3 + X86::AddrIndexReg).getReg());
       if (Dest == Mask || Dest == Index || Mask == Index)
         return Warning(Ops[0]->getStartLoc(), "mask, index, and destination "
                                               "registers should be distinct");
-    break;
-  }
-  case X86::VGATHERDPDZ128rm:
-  case X86::VGATHERDPDZ256rm:
-  case X86::VGATHERDPDZrm:
-  case X86::VGATHERDPSZ128rm:
-  case X86::VGATHERDPSZ256rm:
-  case X86::VGATHERDPSZrm:
-  case X86::VGATHERQPDZ128rm:
-  case X86::VGATHERQPDZ256rm:
-  case X86::VGATHERQPDZrm:
-  case X86::VGATHERQPSZ128rm:
-  case X86::VGATHERQPSZ256rm:
-  case X86::VGATHERQPSZrm:
-  case X86::VPGATHERDDZ128rm:
-  case X86::VPGATHERDDZ256rm:
-  case X86::VPGATHERDDZrm:
-  case X86::VPGATHERDQZ128rm:
-  case X86::VPGATHERDQZ256rm:
-  case X86::VPGATHERDQZrm:
-  case X86::VPGATHERQDZ128rm:
-  case X86::VPGATHERQDZ256rm:
-  case X86::VPGATHERQDZrm:
-  case X86::VPGATHERQQZ128rm:
-  case X86::VPGATHERQQZ256rm:
-  case X86::VPGATHERQQZrm: {
-    unsigned Dest = MRI->getEncodingValue(Inst.getOperand(0).getReg());
-    unsigned Index =
-      MRI->getEncodingValue(Inst.getOperand(4 + X86::AddrIndexReg).getReg());
-    if (Dest == Index)
-      return Warning(Ops[0]->getStartLoc(), "index and destination registers "
-                                            "should be distinct");
-    break;
     }
   }
 
-  const MCInstrDesc &MCID = MII.get(Inst.getOpcode());
   // Check that we aren't mixing AH/BH/CH/DH with REX prefix. We only need to
   // check this with the legacy encoding, VEX/EVEX/XOP don't use REX.
-  if ((MCID.TSFlags & X86II::EncodingMask) == 0) {
+  if ((TSFlags & X86II::EncodingMask) == 0) {
     MCPhysReg HReg = X86::NoRegister;
-    bool UsesRex = MCID.TSFlags & X86II::REX_W;
+    bool UsesRex = TSFlags & X86II::REX_W;
     unsigned NumOps = Inst.getNumOperands();
     for (unsigned i = 0; i != NumOps; ++i) {
       const MCOperand &MO = Inst.getOperand(i);
       if (!MO.isReg())
         continue;
       unsigned Reg = MO.getReg();
       if (Reg == X86::AH || Reg == X86::BH || Reg == X86::CH || Reg == X86::DH)
         HReg = Reg;