[mlir][dxsa] Add dcl_output_siv instruction

Example:
  dxsa.dcl_output_siv <type = output, components = 4, mask = <x, y, z, w>, index = [0]>, <position>

Signed-off-by: Vladimir Shiryaev <tagolog@users.noreply.github.com>

Author: tagolog

mlir/include/mlir/Dialect/DXSA/IR/DXSAOps.td

@@ -754,4 +754,21 @@ def DXSA_DclOutputSgv : DXSA_Op<"dcl_output_sgv"> {
   let assemblyFormat = "$operand `,` $name attr-dict";
 }
 
+def DXSA_DclOutputSiv : DXSA_Op<"dcl_output_siv"> {
+  let summary = "declares an output as a System Interpreted Value";
+  let description = [{
+    The `dxsa.dcl_output_siv` operation declares an output to be written
+    that represents a System Interpreted Value.
+    
+    Example:
+
+    ```mlir
+    dxsa.dcl_output_siv <type = output, components = 4, mask = <x, y, z, w>, index = [3]>, <position>
+    ```
+  }];
+  let arguments = (ins DXSA_InlineOperandAttr:$operand,
+                       DXSA_SystemValueNameAttr:$name);
+  let assemblyFormat = "$operand `,` $name attr-dict";
+}
+
 #endif // DXSA_OPS

mlir/lib/Target/DXSA/BinaryParser.cpp

@@ -647,6 +647,12 @@ class DXBuilder {
     return dxsa::DclOutputSgv::create(builder, loc, operand, nameAttr);
   }
 
+  Instruction buildDclOutputSiv(dxsa::InlineOperandAttr operand,
+                                dxsa::SystemValueName name, Location loc) {
+    auto nameAttr = dxsa::SystemValueNameAttr::get(builder.getContext(), name);
+    return dxsa::DclOutputSiv::create(builder, loc, operand, nameAttr);
+  }
+
 private:
   MLIRContext *context;
   ModuleOp module;
@@ -1202,6 +1208,14 @@ class Parser {
     return builder.buildDclOutputSgv(*operand, *name, loc);
   }
 
+  FailureOr<Instruction> parseDclOutputSiv(Location loc) {
+    auto operand = parseInlineOperand();
+    FAILURE_IF_FAILED(operand);
+    auto name = parseSystemValueName(getLocation());
+    FAILURE_IF_FAILED(name);
+    return builder.buildDclOutputSiv(*operand, *name, loc);
+  }
+
   OptionalParseResult parseDclInstruction(uint32_t opcodeToken, Location loc,
                                           Instruction &out) {
     FailureOr<Instruction> result;
@@ -1254,6 +1268,9 @@ class Parser {
     case D3D10_SB_OPCODE_DCL_OUTPUT_SGV:
       result = parseDclOutputSgv(loc);
       break;
+    case D3D10_SB_OPCODE_DCL_OUTPUT_SIV:
+      result = parseDclOutputSiv(loc);
+      break;
     default:
       return std::nullopt;
     }

mlir/test/Target/DXSA/dcl_output_siv.mlir

@@ -0,0 +1,6 @@
+// RUN: mlir-translate --import-dxsa-bin %S/inputs/dcl_output_siv.bin | FileCheck %s
+
+// CHECK:      module {
+// CHECK-NEXT:   dxsa.dcl_output_siv <type = output, components = 4, mask = <x, y, z, w>, index = [0]>, <position>
+// CHECK-NEXT:   dxsa.dcl_output_siv <type = output, components = 4, mask = <x>, index = [1]>, <clipDistance>
+// CHECK-NEXT: }