early-access version 1255

src/video_core/shader/decode/bfi.cpp

@@ -0,0 +1,45 @@
+// 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/node_helper.h"
+#include "video_core/shader/shader_ir.h"
+
+namespace VideoCommon::Shader {
+
+using Tegra::Shader::Instruction;
+using Tegra::Shader::OpCode;
+
+u32 ShaderIR::DecodeBfi(NodeBlock& bb, u32 pc) {
+    const Instruction instr = {program_code[pc]};
+    const auto opcode = OpCode::Decode(instr);
+
+    const auto [packed_shift, base] = [&]() -> std::pair<Node, Node> {
+        switch (opcode->get().GetId()) {
+        case OpCode::Id::BFI_RC:
+            return {GetRegister(instr.gpr39),
+                    GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset())};
+        case OpCode::Id::BFI_IMM_R:
+            return {Immediate(instr.alu.GetSignedImm20_20()), GetRegister(instr.gpr39)};
+        default:
+            UNREACHABLE();
+            return {Immediate(0), Immediate(0)};
+        }
+    }();
+    const Node insert = GetRegister(instr.gpr8);
+    const Node offset = BitfieldExtract(packed_shift, 0, 8);
+    const Node bits = BitfieldExtract(packed_shift, 8, 8);
+
+    const Node value =
+        Operation(OperationCode::UBitfieldInsert, PRECISE, base, insert, offset, bits);
+
+    SetInternalFlagsFromInteger(bb, value, instr.generates_cc);
+    SetRegister(bb, instr.gpr0, value);
+
+    return pc;
+}
+
+} // namespace VideoCommon::Shader