[clang] [llvm] [RISCV] Support spacemit vsmtvdotii externsions (PR #202533)

[Luke Lau via cfe-commits]

================
@@ -54,6 +54,53 @@ defvar SlideEncodes = [SlideEncode<0b00, "1">,
                        SlideEncode<0b01, "2">,
                        SlideEncode<0b10, "3">];
 
+class HPEncode<bits<3> encoding, string name> {
+  bits<3> Encoding = encoding;
+  string Name = name;
+}
+defvar HPEncodes = [HPEncode<0b011, "u">,
+                    HPEncode<0b110, "us">,
+                    HPEncode<0b101, "su">,
+                    HPEncode<0b100, "">];
+
+def SMTVType : AsmOperandClass {
+  let Name = "SMTVType";
+  let RenderMethod = "addSMTVTypeOperand";
+  let ParserMethod = "parseSMTVType";
+  let DiagnosticType = "InvalidSMTType";
+  let DiagnosticString =
+      "This Inst only supports i4 and i8, i8 is the default type";
+  let IsOptional = 1;
+  let DefaultMethod = "defaultSMTVType";
+}
+
+// SpacemiT's Integer Matrix only supports i4 and i8
+def SMT_INT : Operand<XLenVT> {
+  let ParserMatchClass = SMTVType;
+  let PrintMethod = "printSMTVType";
+  let DecoderMethod = "decodeUImmOperand<2>";
+  let OperandType = "OPERAND_SMTVType";
+  let OperandNamespace = "RISCVOp";
+}
+
+def SMTI8 : AsmOperandClass {
+  let Name = "SMTI8";
+  let RenderMethod = "addSMTVTypeOperand";
+  let DiagnosticType = "InvalidSMTI8";
+  let DiagnosticString = "smt.vmadot with slide only supports i8 type";
+  let ParserMethod = "parseSMTVType";
+  let IsOptional = 1;
+  let DefaultMethod = "defaultSMTVType";
+}
+
+def SMT_I8  : Operand<XLenVT> {
----------------
lukel97 wrote:

Nit
```suggestion
def SMT_I8 : Operand<XLenVT> {
```

https://github.com/llvm/llvm-project/pull/202533