1 files changed, 55 insertions, 0 deletions

diff --git a/src/video_core/shader/decode/shift.cpp b/src/video_core/shader/decode/shift.cpp
new file mode 100644
index 000000000..85026bb37
--- /dev/null
+++ b/src/video_core/shader/decode/shift.cpp
@@ -0,0 +1,55 @@
+// 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::DecodeShift(BasicBlock& bb, const BasicBlock& code, u32 pc) {
+    const Instruction instr = {program_code[pc]};
+    const auto opcode = OpCode::Decode(instr);
+
+    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);
+        }
+    }();
+
+    switch (opcode->get().GetId()) {
+    case OpCode::Id::SHR_C:
+    case OpCode::Id::SHR_R:
+    case OpCode::Id::SHR_IMM: {
+        const Node value = SignedOperation(OperationCode::IArithmeticShiftRight,
+                                           instr.shift.is_signed, PRECISE, op_a, op_b);
+        SetInternalFlagsFromInteger(bb, value, instr.generates_cc);
+        SetRegister(bb, instr.gpr0, value);
+        break;
+    }
+    case OpCode::Id::SHL_C:
+    case OpCode::Id::SHL_R:
+    case OpCode::Id::SHL_IMM: {
+        const Node value = Operation(OperationCode::ILogicalShiftLeft, PRECISE, op_a, op_b);
+        SetInternalFlagsFromInteger(bb, value, instr.generates_cc);
+        SetRegister(bb, instr.gpr0, value);
+        break;
+    }
+    default:
+        UNIMPLEMENTED_MSG("Unhandled shift instruction: {}", opcode->get().GetName());
+    }
+
+    return pc;
+}
+
+} // namespace VideoCommon::Shader
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