feat(shader): rdna export op decoder impl

core/shader/recompilier/RdnaDecoder/include/RdnaDecoder/RdnaInstruction.hpp

@@ -42,6 +42,10 @@ struct RdnaInstruction {
     std::uint32_t dataDwordCount;
     bool clampResult;
     bool is64Bit;
+    std::uint32_t exportTarget;
+    std::uint32_t exportEnableMask;
+    bool exportIsCompressed;
+    bool exportIsLast;
 };
 
 }

core/shader/recompilier/RdnaDecoder/src/RdnaExportOpDecoder.cpp

@@ -3,8 +3,84 @@
 
 namespace ShaderRecompiler {
 
-RdnaInstruction DecodeRdnaExportOp(std::span<const std::uint32_t> code, std::uint32_t wordIndex) {
-    throw std::runtime_error("DecodeRdnaExportOp not implemented");
+namespace {
+
+[[nodiscard]] RdnaOpcode MapExportTargetToOpcode(std::uint32_t target) {
+    if (target <= 7u) {
+        return RdnaOpcode::ExpMrt;
+    }
+    if (target >= 12u && target <= 15u) {
+        return RdnaOpcode::ExpPos;
+    }
+    if (target >= 32u && target <= 63u) {
+        return RdnaOpcode::ExpParam;
+    }
+    throw std::runtime_error("unsupported export target");
+}
+
+[[nodiscard]] RdnaOperand DecodeExportSourceRegister(std::uint32_t reg) {
+    RdnaOperand operand{};
+    operand.kind = RdnaOperandKind::VectorRegister;
+    operand.reg = reg;
+    operand.value = 0;
+    operand.negate = false;
+    operand.absolute = false;
+    return operand;
+}
+
+}
+
+RdnaInstruction DecodeRdnaExportOp(std::span<const std::uint32_t> code, std::uint32_t wordIndex) {
+    if (wordIndex + 1u >= code.size()) {
+        throw std::runtime_error("truncated export instruction");
+    }
+
+    const std::uint32_t word0 = code[wordIndex];
+    const std::uint32_t word1 = code[wordIndex + 1u];
+
+    const std::uint32_t target = (word0 >> 4u) & 0x3Fu;
+    const std::uint32_t en = word0 & 0xFu;
+    const bool compr = ((word0 >> 10u) & 0x1u) != 0u;
+    const bool done = ((word0 >> 11u) & 0x1u) != 0u;
+
+    const RdnaOpcode op = MapExportTargetToOpcode(target);
+
+    RdnaInstruction instruction{};
+    instruction.op = op;
+    instruction.programCounter = wordIndex * 4u;
+
+    instruction.destination = RdnaOperand{};
+    instruction.destination.kind = RdnaOperandKind::Null;
+    instruction.destination.reg = 0;
+    instruction.destination.value = 0;
+    instruction.destination.negate = false;
+    instruction.destination.absolute = false;
+
+    instruction.source0 = DecodeExportSourceRegister(word1 & 0xFFu);
+    instruction.source1 = DecodeExportSourceRegister((word1 >> 8u) & 0xFFu);
+    instruction.source2 = DecodeExportSourceRegister((word1 >> 16u) & 0xFFu);
+    instruction.source3 = DecodeExportSourceRegister((word1 >> 24u) & 0xFFu);
+
+    instruction.branchOffset = 0;
+    instruction.memoryOffset = 0;
+
+    if (en == 0u) {
+        instruction.dataDwordCount = 0u;
+    } else if (compr) {
+        instruction.dataDwordCount = 2u;
+    } else {
+        instruction.dataDwordCount = 4u;
+    }
+
+    instruction.clampResult = false;
+    instruction.is64Bit = false;
+
+    instruction.exportTarget = target;
+    instruction.exportEnableMask = en;
+    instruction.exportIsCompressed = compr;
+    instruction.exportIsLast = done;
+
+    return instruction;
 }
 
 }