1 files changed, 51 insertions, 0 deletions
diff --git a/src/video_core/shader/decode/register_set_predicate.cpp b/src/video_core/shader/decode/register_set_predicate.cpp
new file mode 100644
index 000000000..bdb4424a6
--- /dev/null
+++ b/src/video_core/shader/decode/register_set_predicate.cpp
@@ -0,0 +1,51 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "video_core/engines/shader_bytecode.h"
+#include "video_core/shader/shader_ir.h"
+
+namespace VideoCommon::Shader {
+
+using Tegra::Shader::Instruction;
+using Tegra::Shader::OpCode;
+
+u32 ShaderIR::DecodeRegisterSetPredicate(BasicBlock& bb, const BasicBlock& code, u32 pc) {
+    const Instruction instr = {program_code[pc]};
+    const auto opcode = OpCode::Decode(instr);
+
+    UNIMPLEMENTED_IF(instr.r2p.mode != Tegra::Shader::R2pMode::Pr);
+
+    const Node apply_mask = [&]() {
+        switch (opcode->get().GetId()) {
+        case OpCode::Id::R2P_IMM:
+            return Immediate(static_cast<u32>(instr.r2p.immediate_mask));
+        default:
+            UNREACHABLE();
+            return Immediate(static_cast<u32>(instr.r2p.immediate_mask));
+        }
+    }();
+    const Node mask = GetRegister(instr.gpr8);
+    const auto offset = static_cast<u32>(instr.r2p.byte) * 8;
+
+    constexpr u32 programmable_preds = 7;
+    for (u64 pred = 0; pred < programmable_preds; ++pred) {
+        const auto shift = static_cast<u32>(pred);
+
+        const Node apply_compare = BitfieldExtract(apply_mask, shift, 1);
+        const Node condition =
+            Operation(OperationCode::LogicalUNotEqual, apply_compare, Immediate(0));
+
+        const Node value_compare = BitfieldExtract(mask, offset + shift, 1);
+        const Node value = Operation(OperationCode::LogicalUNotEqual, value_compare, Immediate(0));
+
+        const Node code = Operation(OperationCode::LogicalAssign, GetPredicate(pred), value);
+        bb.push_back(Conditional(condition, {code}));
+    }
+
+    return pc;
+}
+
+} // namespace VideoCommon::Shader
+\ No newline at end of file