Merge pull request #1927 from ReinUsesLisp/shader-ir

video_core: Replace gl_shader_decompiler with an IR based decompiler

1 files changed, 41 insertions, 0 deletions

diff --git a/src/video_core/shader/decode/bfi.cpp b/src/video_core/shader/decode/bfi.cpp
new file mode 100644
index 000000000..942d6729d
--- /dev/null
+++ b/src/video_core/shader/decode/bfi.cpp
@@ -0,0 +1,41 @@
+// 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::DecodeBfi(BasicBlock& bb, const BasicBlock& code, u32 pc) {
+    const Instruction instr = {program_code[pc]};
+    const auto opcode = OpCode::Decode(instr);
+
+    const auto [base, packed_shift] = [&]() -> std::tuple<Node, Node> {
+        switch (opcode->get().GetId()) {
+        case OpCode::Id::BFI_IMM_R:
+            return {GetRegister(instr.gpr39), Immediate(instr.alu.GetSignedImm20_20())};
+        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
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