[llvm] [ARM][TableGen][MC] Change the ARM mnemonic operands to be optional for ASM parsing (PR #83436)

[Alfie Richards via llvm-commits]

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@@ -5972,17 +6154,30 @@ ParseStatus ARMAsmParser::parseFPImm(OperandVector &Operands) {
   // integer constant. Make sure we don't try to parse an FPImm
   // for these:
   // vmov.i{8|16|32|64} <dreg|qreg>, #imm
-  ARMOperand &TyOp = static_cast<ARMOperand &>(*Operands[2]);
-  bool isVmovf = TyOp.isToken() &&
-                 (TyOp.getToken() == ".f32" || TyOp.getToken() == ".f64" ||
-                  TyOp.getToken() == ".f16");
+
+  bool isVmovf = false;
+  unsigned MnemonicOpsEndInd = getMnemonicOpsEndInd(Operands);
+  for (unsigned I = 1; I < MnemonicOpsEndInd; ++I) {
+    ARMOperand &TyOp = static_cast<ARMOperand &>(*Operands[I]);
+    if (TyOp.isToken() &&
+        (TyOp.getToken() == ".f32" || TyOp.getToken() == ".f64" ||
+         TyOp.getToken() == ".f16")) {
+      isVmovf = true;
+      break;
+    }
+  }
+
   ARMOperand &Mnemonic = static_cast<ARMOperand &>(*Operands[0]);
   bool isFconst = Mnemonic.isToken() && (Mnemonic.getToken() == "fconstd" ||
                                          Mnemonic.getToken() == "fconsts");
   if (!(isVmovf || isFconst))
     return ParseStatus::NoMatch;
 
-  Parser.Lex(); // Eat '#' or '$'.
+  if (Parser.getTok().getKind() == llvm::AsmToken::Hash ||
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AlfieRichardsArm wrote:

Ahh yes, thank you

https://github.com/llvm/llvm-project/pull/83436