shader_decode: Implement ISETP

src/video_core/shader/decode/integer_set_predicate.cpp

@@ -11,12 +11,41 @@ namespace VideoCommon::Shader {
 
 using Tegra::Shader::Instruction;
 using Tegra::Shader::OpCode;
+using Tegra::Shader::Pred;
 
 u32 ShaderIR::DecodeIntegerSetPredicate(BasicBlock& bb, u32 pc) {
     const Instruction instr = {program_code[pc]};
     const auto opcode = OpCode::Decode(instr);
 
-    UNIMPLEMENTED();
+    const Node op_a = GetRegister(instr.gpr8);
+
+    const Node op_b = [&]() {
+        if (instr.is_b_imm) {
+            return Immediate(instr.alu.GetSignedImm20_20());
+        } else if (instr.is_b_gpr) {
+            return GetRegister(instr.gpr20);
+        } else {
+            return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.offset);
+        }
+    }();
+
+    // We can't use the constant predicate as destination.
+    ASSERT(instr.isetp.pred3 != static_cast<u64>(Pred::UnusedIndex));
+
+    const Node second_pred = GetPredicate(instr.isetp.pred39, instr.isetp.neg_pred != 0);
+    const Node predicate =
+        GetPredicateComparisonInteger(instr.isetp.cond, instr.isetp.is_signed, op_a, op_b);
+
+    // Set the primary predicate to the result of Predicate OP SecondPredicate
+    const OperationCode combiner = GetPredicateCombiner(instr.isetp.op);
+    const Node value = Operation(combiner, predicate, second_pred);
+    SetPredicate(bb, instr.isetp.pred3, value);
+
+    if (instr.isetp.pred0 != static_cast<u64>(Pred::UnusedIndex)) {
+        // Set the secondary predicate to the result of !Predicate OP SecondPredicate, if enabled
+        const Node negated_pred = Operation(OperationCode::LogicalNegate, predicate);
+        SetPredicate(bb, instr.isetp.pred0, Operation(combiner, negated_pred, second_pred));
+    }
 
     return pc;
 }