7 files changed, 2093 insertions, 1 deletions

diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 24b7a083c..0a3e2f4d1 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -32,6 +32,8 @@ add_custom_command(OUTPUT scm_rev.cpp
     DEPENDS
       # WARNING! It was too much work to try and make a common location for this list,
       # so if you need to change it, please update CMakeModules/GenerateSCMRev.cmake as well
+      "${VIDEO_CORE}/renderer_opengl/gl_arb_decompiler.cpp"
+      "${VIDEO_CORE}/renderer_opengl/gl_arb_decompiler.h"
       "${VIDEO_CORE}/renderer_opengl/gl_shader_cache.cpp"
       "${VIDEO_CORE}/renderer_opengl/gl_shader_cache.h"
       "${VIDEO_CORE}/renderer_opengl/gl_shader_decompiler.cpp"
diff --git a/src/video_core/CMakeLists.txt b/src/video_core/CMakeLists.txt
index 2bf8d68ce..2af713af2 100644
--- a/src/video_core/CMakeLists.txt
+++ b/src/video_core/CMakeLists.txt
@@ -54,6 +54,8 @@ add_library(video_core STATIC
     rasterizer_interface.h
     renderer_base.cpp
     renderer_base.h
+    renderer_opengl/gl_arb_decompiler.cpp
+    renderer_opengl/gl_arb_decompiler.h
     renderer_opengl/gl_buffer_cache.cpp
     renderer_opengl/gl_buffer_cache.h
     renderer_opengl/gl_device.cpp
diff --git a/src/video_core/renderer_opengl/gl_arb_decompiler.cpp b/src/video_core/renderer_opengl/gl_arb_decompiler.cpp
new file mode 100644
index 000000000..6a23221bb
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_arb_decompiler.cpp
@@ -0,0 +1,2051 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <array>
+#include <cstddef>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <variant>
+
+#include <fmt/format.h>
+
+#include "common/alignment.h"
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "video_core/renderer_opengl/gl_arb_decompiler.h"
+#include "video_core/renderer_opengl/gl_device.h"
+#include "video_core/shader/registry.h"
+#include "video_core/shader/shader_ir.h"
+
+// Predicates in the decompiled code follow the convention that -1 means true and 0 means false.
+// GLASM lacks booleans, so they have to be implemented as integers.
+// Using -1 for true is useful because both CMP.S and NOT.U can negate it, and CMP.S can be used to
+// select between two values, because -1 will be evaluated as true and 0 as false.
+
+namespace OpenGL {
+
+namespace {
+
+using Tegra::Engines::ShaderType;
+using Tegra::Shader::Attribute;
+using Tegra::Shader::PixelImap;
+using Tegra::Shader::Register;
+using namespace VideoCommon::Shader;
+using Operation = const OperationNode&;
+
+constexpr std::array INTERNAL_FLAG_NAMES = {"ZERO", "SIGN", "CARRY", "OVERFLOW"};
+
+char Swizzle(std::size_t component) {
+    ASSERT(component < 4);
+    return component["xyzw"];
+}
+
+constexpr bool IsGenericAttribute(Attribute::Index index) {
+    return index >= Attribute::Index::Attribute_0 && index <= Attribute::Index::Attribute_31;
+}
+
+u32 GetGenericAttributeIndex(Attribute::Index index) {
+    ASSERT(IsGenericAttribute(index));
+    return static_cast<u32>(index) - static_cast<u32>(Attribute::Index::Attribute_0);
+}
+
+std::string_view Modifiers(Operation operation) {
+    const auto meta = std::get_if<MetaArithmetic>(&operation.GetMeta());
+    if (meta && meta->precise) {
+        return ".PREC";
+    }
+    return "";
+}
+
+std::string_view GetInputFlags(PixelImap attribute) {
+    switch (attribute) {
+    case PixelImap::Perspective:
+        return "";
+    case PixelImap::Constant:
+        return "FLAT ";
+    case PixelImap::ScreenLinear:
+        return "NOPERSPECTIVE ";
+    case PixelImap::Unused:
+        break;
+    }
+    UNIMPLEMENTED_MSG("Unknown attribute usage index={}", static_cast<int>(attribute));
+    return {};
+}
+
+std::string_view ImageType(Tegra::Shader::ImageType image_type) {
+    switch (image_type) {
+    case Tegra::Shader::ImageType::Texture1D:
+        return "1D";
+    case Tegra::Shader::ImageType::TextureBuffer:
+        return "BUFFER";
+    case Tegra::Shader::ImageType::Texture1DArray:
+        return "ARRAY1D";
+    case Tegra::Shader::ImageType::Texture2D:
+        return "2D";
+    case Tegra::Shader::ImageType::Texture2DArray:
+        return "ARRAY2D";
+    case Tegra::Shader::ImageType::Texture3D:
+        return "3D";
+    }
+    UNREACHABLE();
+    return {};
+}
+
+std::string_view StackName(MetaStackClass stack) {
+    switch (stack) {
+    case MetaStackClass::Ssy:
+        return "SSY";
+    case MetaStackClass::Pbk:
+        return "PBK";
+    }
+    UNREACHABLE();
+    return "";
+};
+
+std::string_view PrimitiveDescription(Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology topology) {
+    switch (topology) {
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::Points:
+        return "POINTS";
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::Lines:
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::LineStrip:
+        return "LINES";
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::LinesAdjacency:
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::LineStripAdjacency:
+        return "LINES_ADJACENCY";
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::Triangles:
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::TriangleStrip:
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::TriangleFan:
+        return "TRIANGLES";
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::TrianglesAdjacency:
+    case Tegra::Engines::Maxwell3D::Regs::PrimitiveTopology::TriangleStripAdjacency:
+        return "TRIANGLES_ADJACENCY";
+    default:
+        UNIMPLEMENTED_MSG("topology={}", static_cast<int>(topology));
+        return "POINTS";
+    }
+}
+
+std::string_view TopologyName(Tegra::Shader::OutputTopology topology) {
+    switch (topology) {
+    case Tegra::Shader::OutputTopology::PointList:
+        return "POINTS";
+    case Tegra::Shader::OutputTopology::LineStrip:
+        return "LINE_STRIP";
+    case Tegra::Shader::OutputTopology::TriangleStrip:
+        return "TRIANGLE_STRIP";
+    default:
+        UNIMPLEMENTED_MSG("Unknown output topology: {}", static_cast<u32>(topology));
+        return "points";
+    }
+}
+
+std::string_view StageInputName(ShaderType stage) {
+    switch (stage) {
+    case ShaderType::Vertex:
+    case ShaderType::Geometry:
+        return "vertex";
+    case ShaderType::Fragment:
+        return "fragment";
+    case ShaderType::Compute:
+        return "invocation";
+    default:
+        UNREACHABLE();
+        return "";
+    }
+}
+
+std::string TextureType(const MetaTexture& meta) {
+    if (meta.sampler.is_buffer) {
+        return "BUFFER";
+    }
+    std::string type;
+    if (meta.sampler.is_shadow) {
+        type += "SHADOW";
+    }
+    if (meta.sampler.is_array) {
+        type += "ARRAY";
+    }
+    type += [&meta] {
+        switch (meta.sampler.type) {
+        case Tegra::Shader::TextureType::Texture1D:
+            return "1D";
+        case Tegra::Shader::TextureType::Texture2D:
+            return "2D";
+        case Tegra::Shader::TextureType::Texture3D:
+            return "3D";
+        case Tegra::Shader::TextureType::TextureCube:
+            return "CUBE";
+        }
+        UNREACHABLE();
+        return "2D";
+    }();
+    return type;
+}
+
+std::string GlobalMemoryName(const GlobalMemoryBase& base) {
+    return fmt::format("gmem{}_{}", base.cbuf_index, base.cbuf_offset);
+}
+
+class ARBDecompiler final {
+public:
+    explicit ARBDecompiler(const Device& device, const ShaderIR& ir, const Registry& registry,
+                           ShaderType stage, std::string_view identifier);
+
+    std::string Code() const {
+        return shader_source;
+    }
+
+private:
+    void DeclareHeader();
+    void DeclareVertex();
+    void DeclareGeometry();
+    void DeclareFragment();
+    void DeclareCompute();
+    void DeclareInputAttributes();
+    void DeclareOutputAttributes();
+    void DeclareLocalMemory();
+    void DeclareGlobalMemory();
+    void DeclareConstantBuffers();
+    void DeclareRegisters();
+    void DeclareTemporaries();
+    void DeclarePredicates();
+    void DeclareInternalFlags();
+
+    void InitializeVariables();
+
+    void DecompileAST();
+    void DecompileBranchMode();
+
+    void VisitAST(const ASTNode& node);
+    std::string VisitExpression(const Expr& node);
+
+    void VisitBlock(const NodeBlock& bb);
+
+    std::string Visit(const Node& node);
+
+    std::pair<std::string, std::size_t> BuildCoords(Operation);
+    std::string BuildAoffi(Operation);
+    void Exit();
+
+    std::string Assign(Operation);
+    std::string Select(Operation);
+    std::string FClamp(Operation);
+    std::string FCastHalf0(Operation);
+    std::string FCastHalf1(Operation);
+    std::string FSqrt(Operation);
+    std::string FSwizzleAdd(Operation);
+    std::string HAdd2(Operation);
+    std::string HMul2(Operation);
+    std::string HFma2(Operation);
+    std::string HAbsolute(Operation);
+    std::string HNegate(Operation);
+    std::string HClamp(Operation);
+    std::string HCastFloat(Operation);
+    std::string HUnpack(Operation);
+    std::string HMergeF32(Operation);
+    std::string HMergeH0(Operation);
+    std::string HMergeH1(Operation);
+    std::string HPack2(Operation);
+    std::string LogicalAssign(Operation);
+    std::string LogicalPick2(Operation);
+    std::string LogicalAnd2(Operation);
+    std::string FloatOrdered(Operation);
+    std::string FloatUnordered(Operation);
+    std::string LogicalAddCarry(Operation);
+    std::string Texture(Operation);
+    std::string TextureGather(Operation);
+    std::string TextureQueryDimensions(Operation);
+    std::string TextureQueryLod(Operation);
+    std::string TexelFetch(Operation);
+    std::string TextureGradient(Operation);
+    std::string ImageLoad(Operation);
+    std::string ImageStore(Operation);
+    std::string Branch(Operation);
+    std::string BranchIndirect(Operation);
+    std::string PushFlowStack(Operation);
+    std::string PopFlowStack(Operation);
+    std::string Exit(Operation);
+    std::string Discard(Operation);
+    std::string EmitVertex(Operation);
+    std::string EndPrimitive(Operation);
+    std::string InvocationId(Operation);
+    std::string YNegate(Operation);
+    std::string ThreadId(Operation);
+    std::string ShuffleIndexed(Operation);
+    std::string Barrier(Operation);
+    std::string MemoryBarrierGroup(Operation);
+    std::string MemoryBarrierGlobal(Operation);
+
+    template <const std::string_view& op>
+    std::string Unary(Operation operation) {
+        const std::string temporary = AllocTemporary();
+        AddLine("{}{} {}, {};", op, Modifiers(operation), temporary, Visit(operation[0]));
+        return temporary;
+    }
+
+    template <const std::string_view& op>
+    std::string Binary(Operation operation) {
+        const std::string temporary = AllocTemporary();
+        AddLine("{}{} {}, {}, {};", op, Modifiers(operation), temporary, Visit(operation[0]),
+                Visit(operation[1]));
+        return temporary;
+    }
+
+    template <const std::string_view& op>
+    std::string Trinary(Operation operation) {
+        const std::string temporary = AllocTemporary();
+        AddLine("{}{} {}, {}, {}, {};", op, Modifiers(operation), temporary, Visit(operation[0]),
+                Visit(operation[1]), Visit(operation[2]));
+        return temporary;
+    }
+
+    template <const std::string_view& op, bool unordered>
+    std::string FloatComparison(Operation operation) {
+        const std::string temporary = AllocTemporary();
+        AddLine("TRUNC.U.CC RC.x, {};", Binary<op>(operation));
+        AddLine("MOV.S {}, 0;", temporary);
+        AddLine("MOV.S {} (NE.x), -1;", temporary);
+
+        const std::string op_a = Visit(operation[0]);
+        const std::string op_b = Visit(operation[1]);
+        if constexpr (unordered) {
+            AddLine("SNE.F RC.x, {}, {};", op_a, op_a);
+            AddLine("TRUNC.U.CC RC.x, RC.x;");
+            AddLine("MOV.S {} (NE.x), -1;", temporary);
+            AddLine("SNE.F RC.x, {}, {};", op_b, op_b);
+            AddLine("TRUNC.U.CC RC.x, RC.x;");
+            AddLine("MOV.S {} (NE.x), -1;", temporary);
+        } else if (op == SNE_F) {
+            AddLine("SNE.F RC.x, {}, {};", op_a, op_a);
+            AddLine("TRUNC.U.CC RC.x, RC.x;");
+            AddLine("MOV.S {} (NE.x), 0;", temporary);
+            AddLine("SNE.F RC.x, {}, {};", op_b, op_b);
+            AddLine("TRUNC.U.CC RC.x, RC.x;");
+            AddLine("MOV.S {} (NE.x), 0;", temporary);
+        }
+        return temporary;
+    }
+
+    template <const std::string_view& op, bool is_nan>
+    std::string HalfComparison(Operation operation) {
+        const std::string tmp1 = AllocVectorTemporary();
+        const std::string tmp2 = AllocVectorTemporary();
+        const std::string op_a = Visit(operation[0]);
+        const std::string op_b = Visit(operation[1]);
+        AddLine("UP2H.F {}, {};", tmp1, op_a);
+        AddLine("UP2H.F {}, {};", tmp2, op_b);
+        AddLine("{} {}, {}, {};", op, tmp1, tmp1, tmp2);
+        AddLine("TRUNC.U.CC RC.xy, {};", tmp1);
+        AddLine("MOV.S {}.xy, {{0, 0, 0, 0}};", tmp1);
+        AddLine("MOV.S {}.x (NE.x), -1;", tmp1);
+        AddLine("MOV.S {}.y (NE.y), -1;", tmp1);
+        if constexpr (is_nan) {
+            AddLine("MOVC.F RC.x, {};", op_a);
+            AddLine("MOV.S {}.x (NAN.x), -1;", tmp1);
+            AddLine("MOVC.F RC.x, {};", op_b);
+            AddLine("MOV.S {}.y (NAN.x), -1;", tmp1);
+        }
+        return tmp1;
+    }
+
+    template <const std::string_view& op, const std::string_view& type>
+    std::string AtomicImage(Operation operation) {
+        const auto& meta = std::get<MetaImage>(operation.GetMeta());
+        const u32 image_id = device.GetBaseBindings(stage).image + meta.image.index;
+        const std::size_t num_coords = operation.GetOperandsCount();
+        const std::size_t num_values = meta.values.size();
+
+        const std::string coord = AllocVectorTemporary();
+        const std::string value = AllocVectorTemporary();
+        for (std::size_t i = 0; i < num_coords; ++i) {
+            AddLine("MOV.S {}.{}, {};", coord, Swizzle(i), Visit(operation[i]));
+        }
+        for (std::size_t i = 0; i < num_values; ++i) {
+            AddLine("MOV.F {}.{}, {};", value, Swizzle(i), Visit(meta.values[i]));
+        }
+
+        const std::string result = coord;
+        AddLine("ATOMIM.{}.{} {}.x, {}, {}, image[{}], {};", op, type, result, value, coord,
+                image_id, ImageType(meta.image.type));
+        return fmt::format("{}.x", result);
+    }
+
+    template <const std::string_view& op, const std::string_view& type>
+    std::string Atomic(Operation operation) {
+        const std::string temporary = AllocTemporary();
+        std::string address;
+        std::string_view opname;
+        if (const auto gmem = std::get_if<GmemNode>(&*operation[0])) {
+            AddLine("SUB.U {}, {}, {};", temporary, Visit(gmem->GetRealAddress()),
+                    Visit(gmem->GetBaseAddress()));
+            address = fmt::format("{}[{}]", GlobalMemoryName(gmem->GetDescriptor()), temporary);
+            opname = "ATOMB";
+        } else if (const auto smem = std::get_if<SmemNode>(&*operation[0])) {
+            address = fmt::format("shared_mem[{}]", Visit(smem->GetAddress()));
+            opname = "ATOMS";
+        } else {
+            UNREACHABLE();
+            return "{0, 0, 0, 0}";
+        }
+        AddLine("{}.{}.{} {}, {}, {};", opname, op, type, temporary, Visit(operation[1]), address);
+        return temporary;
+    }
+
+    template <char type>
+    std::string Negate(Operation operation) {
+        const std::string temporary = AllocTemporary();
+        if constexpr (type == 'F') {
+            AddLine("MOV.F32 {}, -{};", temporary, Visit(operation[0]));
+        } else {
+            AddLine("MOV.{} {}, -{};", type, temporary, Visit(operation[0]));
+        }
+        return temporary;
+    }
+
+    template <char type>
+    std::string Absolute(Operation operation) {
+        const std::string temporary = AllocTemporary();
+        AddLine("MOV.{} {}, |{}|;", type, temporary, Visit(operation[0]));
+        return temporary;
+    }
+
+    template <char type>
+    std::string BitfieldInsert(Operation operation) {
+        const std::string temporary = AllocVectorTemporary();
+        AddLine("MOV.{} {}.x, {};", type, temporary, Visit(operation[3]));
+        AddLine("MOV.{} {}.y, {};", type, temporary, Visit(operation[2]));
+        AddLine("BFI.{} {}.x, {}, {}, {};", type, temporary, temporary, Visit(operation[1]),
+                Visit(operation[0]));
+        return fmt::format("{}.x", temporary);
+    }
+
+    template <char type>
+    std::string BitfieldExtract(Operation operation) {
+        const std::string temporary = AllocVectorTemporary();
+        AddLine("MOV.{} {}.x, {};", type, temporary, Visit(operation[2]));
+        AddLine("MOV.{} {}.y, {};", type, temporary, Visit(operation[1]));
+        AddLine("BFE.{} {}.x, {}, {};", type, temporary, temporary, Visit(operation[0]));
+        return fmt::format("{}.x", temporary);
+    }
+
+    template <char swizzle>
+    std::string LocalInvocationId(Operation) {
+        return fmt::format("invocation.localid.{}", swizzle);
+    }
+
+    template <char swizzle>
+    std::string WorkGroupId(Operation) {
+        return fmt::format("invocation.groupid.{}", swizzle);
+    }
+
+    template <char c1, char c2>
+    std::string ThreadMask(Operation) {
+        return fmt::format("{}.thread{}{}mask", StageInputName(stage), c1, c2);
+    }
+
+    template <typename... Args>
+    void AddExpression(std::string_view text, Args&&... args) {
+        shader_source += fmt::format(text, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void AddLine(std::string_view text, Args&&... args) {
+        AddExpression(text, std::forward<Args>(args)...);
+        shader_source += '\n';
+    }
+
+    std::string AllocTemporary() {
+        max_temporaries = std::max(max_temporaries, num_temporaries + 1);
+        return fmt::format("T{}.x", num_temporaries++);
+    }
+
+    std::string AllocVectorTemporary() {
+        max_temporaries = std::max(max_temporaries, num_temporaries + 1);
+        return fmt::format("T{}", num_temporaries++);
+    }
+
+    void ResetTemporaries() noexcept {
+        num_temporaries = 0;
+    }
+
+    const Device& device;
+    const ShaderIR& ir;
+    const Registry& registry;
+    const ShaderType stage;
+
+    std::size_t num_temporaries = 0;
+    std::size_t max_temporaries = 0;
+
+    std::string shader_source;
+
+    static constexpr std::string_view ADD_F32 = "ADD.F32";
+    static constexpr std::string_view ADD_S = "ADD.S";
+    static constexpr std::string_view ADD_U = "ADD.U";
+    static constexpr std::string_view MUL_F32 = "MUL.F32";
+    static constexpr std::string_view MUL_S = "MUL.S";
+    static constexpr std::string_view MUL_U = "MUL.U";
+    static constexpr std::string_view DIV_F32 = "DIV.F32";
+    static constexpr std::string_view DIV_S = "DIV.S";
+    static constexpr std::string_view DIV_U = "DIV.U";
+    static constexpr std::string_view MAD_F32 = "MAD.F32";
+    static constexpr std::string_view RSQ_F32 = "RSQ.F32";
+    static constexpr std::string_view COS_F32 = "COS.F32";
+    static constexpr std::string_view SIN_F32 = "SIN.F32";
+    static constexpr std::string_view EX2_F32 = "EX2.F32";
+    static constexpr std::string_view LG2_F32 = "LG2.F32";
+    static constexpr std::string_view SLT_F = "SLT.F32";
+    static constexpr std::string_view SLT_S = "SLT.S";
+    static constexpr std::string_view SLT_U = "SLT.U";
+    static constexpr std::string_view SEQ_F = "SEQ.F32";
+    static constexpr std::string_view SEQ_S = "SEQ.S";
+    static constexpr std::string_view SEQ_U = "SEQ.U";
+    static constexpr std::string_view SLE_F = "SLE.F32";
+    static constexpr std::string_view SLE_S = "SLE.S";
+    static constexpr std::string_view SLE_U = "SLE.U";
+    static constexpr std::string_view SGT_F = "SGT.F32";
+    static constexpr std::string_view SGT_S = "SGT.S";
+    static constexpr std::string_view SGT_U = "SGT.U";
+    static constexpr std::string_view SNE_F = "SNE.F32";
+    static constexpr std::string_view SNE_S = "SNE.S";
+    static constexpr std::string_view SNE_U = "SNE.U";
+    static constexpr std::string_view SGE_F = "SGE.F32";
+    static constexpr std::string_view SGE_S = "SGE.S";
+    static constexpr std::string_view SGE_U = "SGE.U";
+    static constexpr std::string_view AND_S = "AND.S";
+    static constexpr std::string_view AND_U = "AND.U";
+    static constexpr std::string_view TRUNC_F = "TRUNC.F";
+    static constexpr std::string_view TRUNC_S = "TRUNC.S";
+    static constexpr std::string_view TRUNC_U = "TRUNC.U";
+    static constexpr std::string_view SHL_S = "SHL.S";
+    static constexpr std::string_view SHL_U = "SHL.U";
+    static constexpr std::string_view SHR_S = "SHR.S";
+    static constexpr std::string_view SHR_U = "SHR.U";
+    static constexpr std::string_view OR_S = "OR.S";
+    static constexpr std::string_view OR_U = "OR.U";
+    static constexpr std::string_view XOR_S = "XOR.S";
+    static constexpr std::string_view XOR_U = "XOR.U";
+    static constexpr std::string_view NOT_S = "NOT.S";
+    static constexpr std::string_view NOT_U = "NOT.U";
+    static constexpr std::string_view BTC_S = "BTC.S";
+    static constexpr std::string_view BTC_U = "BTC.U";
+    static constexpr std::string_view BTFM_S = "BTFM.S";
+    static constexpr std::string_view BTFM_U = "BTFM.U";
+    static constexpr std::string_view ROUND_F = "ROUND.F";
+    static constexpr std::string_view CEIL_F = "CEIL.F";
+    static constexpr std::string_view FLR_F = "FLR.F";
+    static constexpr std::string_view I2F_S = "I2F.S";
+    static constexpr std::string_view I2F_U = "I2F.U";
+    static constexpr std::string_view MIN_F = "MIN.F";
+    static constexpr std::string_view MIN_S = "MIN.S";
+    static constexpr std::string_view MIN_U = "MIN.U";
+    static constexpr std::string_view MAX_F = "MAX.F";
+    static constexpr std::string_view MAX_S = "MAX.S";
+    static constexpr std::string_view MAX_U = "MAX.U";
+    static constexpr std::string_view MOV_U = "MOV.U";
+    static constexpr std::string_view TGBALLOT_U = "TGBALLOT.U";
+    static constexpr std::string_view TGALL_U = "TGALL.U";
+    static constexpr std::string_view TGANY_U = "TGANY.U";
+    static constexpr std::string_view TGEQ_U = "TGEQ.U";
+    static constexpr std::string_view EXCH = "EXCH";
+    static constexpr std::string_view ADD = "ADD";
+    static constexpr std::string_view MIN = "MIN";
+    static constexpr std::string_view MAX = "MAX";
+    static constexpr std::string_view AND = "AND";
+    static constexpr std::string_view OR = "OR";
+    static constexpr std::string_view XOR = "XOR";
+    static constexpr std::string_view U32 = "U32";
+    static constexpr std::string_view S32 = "S32";
+
+    static constexpr std::size_t NUM_ENTRIES = static_cast<std::size_t>(OperationCode::Amount);
+    using DecompilerType = std::string (ARBDecompiler::*)(Operation);
+    static constexpr std::array<DecompilerType, NUM_ENTRIES> OPERATION_DECOMPILERS = {
+        &ARBDecompiler::Assign,
+
+        &ARBDecompiler::Select,
+
+        &ARBDecompiler::Binary<ADD_F32>,
+        &ARBDecompiler::Binary<MUL_F32>,
+        &ARBDecompiler::Binary<DIV_F32>,
+        &ARBDecompiler::Trinary<MAD_F32>,
+        &ARBDecompiler::Negate<'F'>,
+        &ARBDecompiler::Absolute<'F'>,
+        &ARBDecompiler::FClamp,
+        &ARBDecompiler::FCastHalf0,
+        &ARBDecompiler::FCastHalf1,
+        &ARBDecompiler::Binary<MIN_F>,
+        &ARBDecompiler::Binary<MAX_F>,
+        &ARBDecompiler::Unary<COS_F32>,
+        &ARBDecompiler::Unary<SIN_F32>,
+        &ARBDecompiler::Unary<EX2_F32>,
+        &ARBDecompiler::Unary<LG2_F32>,
+        &ARBDecompiler::Unary<RSQ_F32>,
+        &ARBDecompiler::FSqrt,
+        &ARBDecompiler::Unary<ROUND_F>,
+        &ARBDecompiler::Unary<FLR_F>,
+        &ARBDecompiler::Unary<CEIL_F>,
+        &ARBDecompiler::Unary<TRUNC_F>,
+        &ARBDecompiler::Unary<I2F_S>,
+        &ARBDecompiler::Unary<I2F_U>,
+        &ARBDecompiler::FSwizzleAdd,
+
+        &ARBDecompiler::Binary<ADD_S>,
+        &ARBDecompiler::Binary<MUL_S>,
+        &ARBDecompiler::Binary<DIV_S>,
+        &ARBDecompiler::Negate<'S'>,
+        &ARBDecompiler::Absolute<'S'>,
+        &ARBDecompiler::Binary<MIN_S>,
+        &ARBDecompiler::Binary<MAX_S>,
+
+        &ARBDecompiler::Unary<TRUNC_S>,
+        &ARBDecompiler::Unary<MOV_U>,
+        &ARBDecompiler::Binary<SHL_S>,
+        &ARBDecompiler::Binary<SHR_U>,
+        &ARBDecompiler::Binary<SHR_S>,
+        &ARBDecompiler::Binary<AND_S>,
+        &ARBDecompiler::Binary<OR_S>,
+        &ARBDecompiler::Binary<XOR_S>,
+        &ARBDecompiler::Unary<NOT_S>,
+        &ARBDecompiler::BitfieldInsert<'S'>,
+        &ARBDecompiler::BitfieldExtract<'S'>,
+        &ARBDecompiler::Unary<BTC_S>,
+        &ARBDecompiler::Unary<BTFM_S>,
+
+        &ARBDecompiler::Binary<ADD_U>,
+        &ARBDecompiler::Binary<MUL_U>,
+        &ARBDecompiler::Binary<DIV_U>,
+        &ARBDecompiler::Binary<MIN_U>,
+        &ARBDecompiler::Binary<MAX_U>,
+        &ARBDecompiler::Unary<TRUNC_U>,
+        &ARBDecompiler::Unary<MOV_U>,
+        &ARBDecompiler::Binary<SHL_U>,
+        &ARBDecompiler::Binary<SHR_U>,
+        &ARBDecompiler::Binary<SHR_U>,
+        &ARBDecompiler::Binary<AND_U>,
+        &ARBDecompiler::Binary<OR_U>,
+        &ARBDecompiler::Binary<XOR_U>,
+        &ARBDecompiler::Unary<NOT_U>,
+        &ARBDecompiler::BitfieldInsert<'U'>,
+        &ARBDecompiler::BitfieldExtract<'U'>,
+        &ARBDecompiler::Unary<BTC_U>,
+        &ARBDecompiler::Unary<BTFM_U>,
+
+        &ARBDecompiler::HAdd2,
+        &ARBDecompiler::HMul2,
+        &ARBDecompiler::HFma2,
+        &ARBDecompiler::HAbsolute,
+        &ARBDecompiler::HNegate,
+        &ARBDecompiler::HClamp,
+        &ARBDecompiler::HCastFloat,
+        &ARBDecompiler::HUnpack,
+        &ARBDecompiler::HMergeF32,
+        &ARBDecompiler::HMergeH0,
+        &ARBDecompiler::HMergeH1,
+        &ARBDecompiler::HPack2,
+
+        &ARBDecompiler::LogicalAssign,
+        &ARBDecompiler::Binary<AND_U>,
+        &ARBDecompiler::Binary<OR_U>,
+        &ARBDecompiler::Binary<XOR_U>,
+        &ARBDecompiler::Unary<NOT_U>,
+        &ARBDecompiler::LogicalPick2,
+        &ARBDecompiler::LogicalAnd2,
+
+        &ARBDecompiler::FloatComparison<SLT_F, false>,
+        &ARBDecompiler::FloatComparison<SEQ_F, false>,
+        &ARBDecompiler::FloatComparison<SLE_F, false>,
+        &ARBDecompiler::FloatComparison<SGT_F, false>,
+        &ARBDecompiler::FloatComparison<SNE_F, false>,
+        &ARBDecompiler::FloatComparison<SGE_F, false>,
+        &ARBDecompiler::FloatOrdered,
+        &ARBDecompiler::FloatUnordered,
+        &ARBDecompiler::FloatComparison<SLT_F, true>,
+        &ARBDecompiler::FloatComparison<SEQ_F, true>,
+        &ARBDecompiler::FloatComparison<SLE_F, true>,
+        &ARBDecompiler::FloatComparison<SGT_F, true>,
+        &ARBDecompiler::FloatComparison<SNE_F, true>,
+        &ARBDecompiler::FloatComparison<SGE_F, true>,
+
+        &ARBDecompiler::Binary<SLT_S>,
+        &ARBDecompiler::Binary<SEQ_S>,
+        &ARBDecompiler::Binary<SLE_S>,
+        &ARBDecompiler::Binary<SGT_S>,
+        &ARBDecompiler::Binary<SNE_S>,
+        &ARBDecompiler::Binary<SGE_S>,
+
+        &ARBDecompiler::Binary<SLT_U>,
+        &ARBDecompiler::Binary<SEQ_U>,
+        &ARBDecompiler::Binary<SLE_U>,
+        &ARBDecompiler::Binary<SGT_U>,
+        &ARBDecompiler::Binary<SNE_U>,
+        &ARBDecompiler::Binary<SGE_U>,
+
+        &ARBDecompiler::LogicalAddCarry,
+
+        &ARBDecompiler::HalfComparison<SLT_F, false>,
+        &ARBDecompiler::HalfComparison<SEQ_F, false>,
+        &ARBDecompiler::HalfComparison<SLE_F, false>,
+        &ARBDecompiler::HalfComparison<SGT_F, false>,
+        &ARBDecompiler::HalfComparison<SNE_F, false>,
+        &ARBDecompiler::HalfComparison<SGE_F, false>,
+        &ARBDecompiler::HalfComparison<SLT_F, true>,
+        &ARBDecompiler::HalfComparison<SEQ_F, true>,
+        &ARBDecompiler::HalfComparison<SLE_F, true>,
+        &ARBDecompiler::HalfComparison<SGT_F, true>,
+        &ARBDecompiler::HalfComparison<SNE_F, true>,
+        &ARBDecompiler::HalfComparison<SGE_F, true>,
+
+        &ARBDecompiler::Texture,
+        &ARBDecompiler::Texture,
+        &ARBDecompiler::TextureGather,
+        &ARBDecompiler::TextureQueryDimensions,
+        &ARBDecompiler::TextureQueryLod,
+        &ARBDecompiler::TexelFetch,
+        &ARBDecompiler::TextureGradient,
+
+        &ARBDecompiler::ImageLoad,
+        &ARBDecompiler::ImageStore,
+
+        &ARBDecompiler::AtomicImage<ADD, U32>,
+        &ARBDecompiler::AtomicImage<AND, U32>,
+        &ARBDecompiler::AtomicImage<OR, U32>,
+        &ARBDecompiler::AtomicImage<XOR, U32>,
+        &ARBDecompiler::AtomicImage<EXCH, U32>,
+
+        &ARBDecompiler::Atomic<EXCH, U32>,
+        &ARBDecompiler::Atomic<ADD, U32>,
+        &ARBDecompiler::Atomic<MIN, U32>,
+        &ARBDecompiler::Atomic<MAX, U32>,
+        &ARBDecompiler::Atomic<AND, U32>,
+        &ARBDecompiler::Atomic<OR, U32>,
+        &ARBDecompiler::Atomic<XOR, U32>,
+
+        &ARBDecompiler::Atomic<EXCH, S32>,
+        &ARBDecompiler::Atomic<ADD, S32>,
+        &ARBDecompiler::Atomic<MIN, S32>,
+        &ARBDecompiler::Atomic<MAX, S32>,
+        &ARBDecompiler::Atomic<AND, S32>,
+        &ARBDecompiler::Atomic<OR, S32>,
+        &ARBDecompiler::Atomic<XOR, S32>,
+
+        &ARBDecompiler::Atomic<ADD, U32>,
+        &ARBDecompiler::Atomic<MIN, U32>,
+        &ARBDecompiler::Atomic<MAX, U32>,
+        &ARBDecompiler::Atomic<AND, U32>,
+        &ARBDecompiler::Atomic<OR, U32>,
+        &ARBDecompiler::Atomic<XOR, U32>,
+
+        &ARBDecompiler::Atomic<ADD, S32>,
+        &ARBDecompiler::Atomic<MIN, S32>,
+        &ARBDecompiler::Atomic<MAX, S32>,
+        &ARBDecompiler::Atomic<AND, S32>,
+        &ARBDecompiler::Atomic<OR, S32>,
+        &ARBDecompiler::Atomic<XOR, S32>,
+
+        &ARBDecompiler::Branch,
+        &ARBDecompiler::BranchIndirect,
+        &ARBDecompiler::PushFlowStack,
+        &ARBDecompiler::PopFlowStack,
+        &ARBDecompiler::Exit,
+        &ARBDecompiler::Discard,
+
+        &ARBDecompiler::EmitVertex,
+        &ARBDecompiler::EndPrimitive,
+
+        &ARBDecompiler::InvocationId,
+        &ARBDecompiler::YNegate,
+        &ARBDecompiler::LocalInvocationId<'x'>,
+        &ARBDecompiler::LocalInvocationId<'y'>,
+        &ARBDecompiler::LocalInvocationId<'z'>,
+        &ARBDecompiler::WorkGroupId<'x'>,
+        &ARBDecompiler::WorkGroupId<'y'>,
+        &ARBDecompiler::WorkGroupId<'z'>,
+
+        &ARBDecompiler::Unary<TGBALLOT_U>,
+        &ARBDecompiler::Unary<TGALL_U>,
+        &ARBDecompiler::Unary<TGANY_U>,
+        &ARBDecompiler::Unary<TGEQ_U>,
+
+        &ARBDecompiler::ThreadId,
+        &ARBDecompiler::ThreadMask<'e', 'q'>,
+        &ARBDecompiler::ThreadMask<'g', 'e'>,
+        &ARBDecompiler::ThreadMask<'g', 't'>,
+        &ARBDecompiler::ThreadMask<'l', 'e'>,
+        &ARBDecompiler::ThreadMask<'l', 't'>,
+        &ARBDecompiler::ShuffleIndexed,
+
+        &ARBDecompiler::Barrier,
+        &ARBDecompiler::MemoryBarrierGroup,
+        &ARBDecompiler::MemoryBarrierGlobal,
+    };
+};
+
+ARBDecompiler::ARBDecompiler(const Device& device, const ShaderIR& ir, const Registry& registry,
+                             ShaderType stage, std::string_view identifier)
+    : device{device}, ir{ir}, registry{registry}, stage{stage} {
+    AddLine("TEMP RC;");
+    if (ir.IsDecompiled()) {
+        DecompileAST();
+    } else {
+        DecompileBranchMode();
+    }
+    AddLine("END");
+
+    const std::string code = std::move(shader_source);
+    DeclareHeader();
+    DeclareVertex();
+    DeclareGeometry();
+    DeclareFragment();
+    DeclareCompute();
+    DeclareInputAttributes();
+    DeclareOutputAttributes();
+    DeclareLocalMemory();
+    DeclareGlobalMemory();
+    DeclareConstantBuffers();
+    DeclareRegisters();
+    DeclareTemporaries();
+    DeclarePredicates();
+    DeclareInternalFlags();
+
+    shader_source += code;
+}
+
+std::string_view HeaderStageName(ShaderType stage) {
+    switch (stage) {
+    case ShaderType::Vertex:
+        return "vp";
+    case ShaderType::Geometry:
+        return "gp";
+    case ShaderType::Fragment:
+        return "fp";
+    case ShaderType::Compute:
+        return "cp";
+    default:
+        UNREACHABLE();
+        return "";
+    }
+}
+
+void ARBDecompiler::DeclareHeader() {
+    AddLine("!!NV{}5.0", HeaderStageName(stage));
+    // Enabling this allows us to cheat on some instructions like TXL with SHADOWARRAY2D
+    AddLine("OPTION NV_internal;");
+    AddLine("OPTION NV_gpu_program_fp64;");
+    AddLine("OPTION NV_shader_storage_buffer;");
+    AddLine("OPTION NV_shader_thread_group;");
+    if (ir.UsesWarps() && device.HasWarpIntrinsics()) {
+        AddLine("OPTION NV_shader_thread_shuffle;");
+    }
+    if (stage == ShaderType::Vertex) {
+        if (device.HasNvViewportArray2()) {
+            AddLine("OPTION NV_viewport_array2;");
+        }
+    }
+    if (stage == ShaderType::Fragment) {
+        AddLine("OPTION ARB_draw_buffers;");
+    }
+    if (device.HasImageLoadFormatted()) {
+        AddLine("OPTION EXT_shader_image_load_formatted;");
+    }
+}
+
+void ARBDecompiler::DeclareVertex() {
+    if (stage != ShaderType::Vertex) {
+        return;
+    }
+    AddLine("OUTPUT result_clip[] = {{ result.clip[0..7] }};");
+}
+
+void ARBDecompiler::DeclareGeometry() {
+    if (stage != ShaderType::Geometry) {
+        return;
+    }
+    const auto& info = registry.GetGraphicsInfo();
+    const auto& header = ir.GetHeader();
+    AddLine("PRIMITIVE_IN {};", PrimitiveDescription(info.primitive_topology));
+    AddLine("PRIMITIVE_OUT {};", TopologyName(header.common3.output_topology));
+    AddLine("VERTICES_OUT {};", header.common4.max_output_vertices.Value());
+    AddLine("ATTRIB vertex_position = vertex.position;");
+}
+
+void ARBDecompiler::DeclareFragment() {
+    if (stage != ShaderType::Fragment) {
+        return;
+    }
+    AddLine("OUTPUT result_color7 = result.color[7];");
+    AddLine("OUTPUT result_color6 = result.color[6];");
+    AddLine("OUTPUT result_color5 = result.color[5];");
+    AddLine("OUTPUT result_color4 = result.color[4];");
+    AddLine("OUTPUT result_color3 = result.color[3];");
+    AddLine("OUTPUT result_color2 = result.color[2];");
+    AddLine("OUTPUT result_color1 = result.color[1];");
+    AddLine("OUTPUT result_color0 = result.color;");
+}
+
+void ARBDecompiler::DeclareCompute() {
+    if (stage != ShaderType::Compute) {
+        return;
+    }
+    const ComputeInfo& info = registry.GetComputeInfo();
+    AddLine("GROUP_SIZE {} {} {};", info.workgroup_size[0], info.workgroup_size[1],
+            info.workgroup_size[2]);
+    if (info.shared_memory_size_in_words > 0) {
+        const u32 size_in_bytes = info.shared_memory_size_in_words * 4;
+        AddLine("SHARED_MEMORY {};", size_in_bytes);
+        AddLine("SHARED shared_mem[] = {{program.sharedmem}};");
+    }
+}
+
+void ARBDecompiler::DeclareInputAttributes() {
+    if (stage == ShaderType::Compute) {
+        return;
+    }
+    const std::string_view stage_name = StageInputName(stage);
+    for (const auto attribute : ir.GetInputAttributes()) {
+        if (!IsGenericAttribute(attribute)) {
+            continue;
+        }
+        const u32 index = GetGenericAttributeIndex(attribute);
+
+        std::string_view suffix;
+        if (stage == ShaderType::Fragment) {
+            const auto input_mode{ir.GetHeader().ps.GetPixelImap(index)};
+            if (input_mode == PixelImap::Unused) {
+                return;
+            }
+            suffix = GetInputFlags(input_mode);
+        }
+        AddLine("{}ATTRIB in_attr{}[] = {{ {}.attrib[{}..{}] }};", suffix, index, stage_name, index,
+                index);
+    }
+}
+
+void ARBDecompiler::DeclareOutputAttributes() {
+    if (stage == ShaderType::Compute) {
+        return;
+    }
+    for (const auto attribute : ir.GetOutputAttributes()) {
+        if (!IsGenericAttribute(attribute)) {
+            continue;
+        }
+        const u32 index = GetGenericAttributeIndex(attribute);
+        AddLine("OUTPUT out_attr{}[] = {{ result.attrib[{}..{}] }};", index, index, index);
+    }
+}
+
+void ARBDecompiler::DeclareLocalMemory() {
+    u64 size = 0;
+    if (stage == ShaderType::Compute) {
+        size = registry.GetComputeInfo().local_memory_size_in_words * 4ULL;
+    } else {
+        size = ir.GetHeader().GetLocalMemorySize();
+    }
+    if (size == 0) {
+        return;
+    }
+    const u64 element_count = Common::AlignUp(size, 4) / 4;
+    AddLine("TEMP lmem[{}];", element_count);
+}
+
+void ARBDecompiler::DeclareGlobalMemory() {
+    u32 binding = 0; // device.GetBaseBindings(stage).shader_storage_buffer;
+    for (const auto& pair : ir.GetGlobalMemory()) {
+        const auto& base = pair.first;
+        AddLine("STORAGE {}[] = {{ program.storage[{}] }};", GlobalMemoryName(base), binding);
+        ++binding;
+    }
+}
+
+void ARBDecompiler::DeclareConstantBuffers() {
+    u32 binding = 0;
+    for (const auto& cbuf : ir.GetConstantBuffers()) {
+        AddLine("CBUFFER cbuf{}[] = {{ program.buffer[{}] }};", cbuf.first, binding);
+        ++binding;
+    }
+}
+
+void ARBDecompiler::DeclareRegisters() {
+    for (const u32 gpr : ir.GetRegisters()) {
+        AddLine("TEMP R{};", gpr);
+    }
+}
+
+void ARBDecompiler::DeclareTemporaries() {
+    for (std::size_t i = 0; i < max_temporaries; ++i) {
+        AddLine("TEMP T{};", i);
+    }
+}
+
+void ARBDecompiler::DeclarePredicates() {
+    for (const Tegra::Shader::Pred pred : ir.GetPredicates()) {
+        AddLine("TEMP P{};", static_cast<u64>(pred));
+    }
+}
+
+void ARBDecompiler::DeclareInternalFlags() {
+    for (const char* name : INTERNAL_FLAG_NAMES) {
+        AddLine("TEMP {};", name);
+    }
+}
+
+void ARBDecompiler::InitializeVariables() {
+    if (stage == ShaderType::Vertex || stage == ShaderType::Geometry) {
+        AddLine("MOV.F result.position, {{0, 0, 0, 1}};");
+    }
+    for (const auto attribute : ir.GetOutputAttributes()) {
+        if (!IsGenericAttribute(attribute)) {
+            continue;
+        }
+        const u32 index = GetGenericAttributeIndex(attribute);
+        AddLine("MOV.F result.attrib[{}], {{0, 0, 0, 1}};", index);
+    }
+    for (const u32 gpr : ir.GetRegisters()) {
+        AddLine("MOV.F R{}, {{0, 0, 0, 0}};", gpr);
+    }
+    for (const Tegra::Shader::Pred pred : ir.GetPredicates()) {
+        AddLine("MOV.U P{}, {{0, 0, 0, 0}};", static_cast<u64>(pred));
+    }
+}
+
+void ARBDecompiler::DecompileAST() {
+    const u32 num_flow_variables = ir.GetASTNumVariables();
+    for (u32 i = 0; i < num_flow_variables; ++i) {
+        AddLine("TEMP F{};", i);
+    }
+    for (u32 i = 0; i < num_flow_variables; ++i) {
+        AddLine("MOV.U F{}, {{0, 0, 0, 0}};", i);
+    }
+
+    InitializeVariables();
+
+    VisitAST(ir.GetASTProgram());
+}
+
+void ARBDecompiler::DecompileBranchMode() {
+    static constexpr u32 FLOW_STACK_SIZE = 20;
+    if (!ir.IsFlowStackDisabled()) {
+        AddLine("TEMP SSY[{}];", FLOW_STACK_SIZE);
+        AddLine("TEMP PBK[{}];", FLOW_STACK_SIZE);
+        AddLine("TEMP SSY_TOP;");
+        AddLine("TEMP PBK_TOP;");
+    }
+
+    AddLine("TEMP PC;");
+
+    if (!ir.IsFlowStackDisabled()) {
+        AddLine("MOV.U SSY_TOP.x, 0;");
+        AddLine("MOV.U PBK_TOP.x, 0;");
+    }
+
+    InitializeVariables();
+
+    const auto basic_block_end = ir.GetBasicBlocks().end();
+    auto basic_block_it = ir.GetBasicBlocks().begin();
+    const u32 first_address = basic_block_it->first;
+    AddLine("MOV.U PC.x, {};", first_address);
+
+    AddLine("REP;");
+
+    std::size_t num_blocks = 0;
+    while (basic_block_it != basic_block_end) {
+        const auto& [address, bb] = *basic_block_it;
+        ++num_blocks;
+
+        AddLine("SEQ.S.CC RC.x, PC.x, {};", address);
+        AddLine("IF NE.x;");
+
+        VisitBlock(bb);
+
+        ++basic_block_it;
+
+        if (basic_block_it != basic_block_end) {
+            const auto op = std::get_if<OperationNode>(&*bb[bb.size() - 1]);
+            if (!op || op->GetCode() != OperationCode::Branch) {
+                const u32 next_address = basic_block_it->first;
+                AddLine("MOV.U PC.x, {};", next_address);
+                AddLine("CONT;");
+            }
+        }
+
+        AddLine("ELSE;");
+    }
+    AddLine("RET;");
+    while (num_blocks--) {
+        AddLine("ENDIF;");
+    }
+
+    AddLine("ENDREP;");
+}
+
+void ARBDecompiler::VisitAST(const ASTNode& node) {
+    if (const auto ast = std::get_if<ASTProgram>(&*node->GetInnerData())) {
+        for (ASTNode current = ast->nodes.GetFirst(); current; current = current->GetNext()) {
+            VisitAST(current);
+        }
+    } else if (const auto ast = std::get_if<ASTIfThen>(&*node->GetInnerData())) {
+        const std::string condition = VisitExpression(ast->condition);
+        ResetTemporaries();
+
+        AddLine("MOVC.U RC.x, {};", condition);
+        AddLine("IF NE.x;");
+        for (ASTNode current = ast->nodes.GetFirst(); current; current = current->GetNext()) {
+            VisitAST(current);
+        }
+        AddLine("ENDIF;");
+    } else if (const auto ast = std::get_if<ASTIfElse>(&*node->GetInnerData())) {
+        AddLine("ELSE;");
+        for (ASTNode current = ast->nodes.GetFirst(); current; current = current->GetNext()) {
+            VisitAST(current);
+        }
+    } else if (const auto ast = std::get_if<ASTBlockDecoded>(&*node->GetInnerData())) {
+        VisitBlock(ast->nodes);
+    } else if (const auto ast = std::get_if<ASTVarSet>(&*node->GetInnerData())) {
+        AddLine("MOV.U F{}, {};", ast->index, VisitExpression(ast->condition));
+        ResetTemporaries();
+    } else if (const auto ast = std::get_if<ASTDoWhile>(&*node->GetInnerData())) {
+        const std::string condition = VisitExpression(ast->condition);
+        ResetTemporaries();
+        AddLine("REP;");
+        for (ASTNode current = ast->nodes.GetFirst(); current; current = current->GetNext()) {
+            VisitAST(current);
+        }
+        AddLine("MOVC.U RC.x, {};", condition);
+        AddLine("BRK (NE.x);");
+        AddLine("ENDREP;");
+    } else if (const auto ast = std::get_if<ASTReturn>(&*node->GetInnerData())) {
+        const bool is_true = ExprIsTrue(ast->condition);
+        if (!is_true) {
+            AddLine("MOVC.U RC.x, {};", VisitExpression(ast->condition));
+            AddLine("IF NE.x;");
+            ResetTemporaries();
+        }
+        if (ast->kills) {
+            AddLine("KIL TR;");
+        } else {
+            Exit();
+        }
+        if (!is_true) {
+            AddLine("ENDIF;");
+        }
+    } else if (const auto ast = std::get_if<ASTBreak>(&*node->GetInnerData())) {
+        if (ExprIsTrue(ast->condition)) {
+            AddLine("BRK;");
+        } else {
+            AddLine("MOVC.U RC.x, {};", VisitExpression(ast->condition));
+            AddLine("BRK (NE.x);");
+            ResetTemporaries();
+        }
+    } else if (std::holds_alternative<ASTLabel>(*node->GetInnerData())) {
+        // Nothing to do
+    } else {
+        UNREACHABLE();
+    }
+}
+
+std::string ARBDecompiler::VisitExpression(const Expr& node) {
+    const std::string result = AllocTemporary();
+    if (const auto expr = std::get_if<ExprAnd>(&*node)) {
+        AddLine("AND.U {}, {}, {};", result, VisitExpression(expr->operand1),
+                VisitExpression(expr->operand2));
+        return result;
+    }
+    if (const auto expr = std::get_if<ExprOr>(&*node)) {
+        const std::string result = AllocTemporary();
+        AddLine("OR.U {}, {}, {};", result, VisitExpression(expr->operand1),
+                VisitExpression(expr->operand2));
+        return result;
+    }
+    if (const auto expr = std::get_if<ExprNot>(&*node)) {
+        const std::string result = AllocTemporary();
+        AddLine("CMP.S {}, {}, 0, -1;", result, VisitExpression(expr->operand1));
+        return result;
+    }
+    if (const auto expr = std::get_if<ExprPredicate>(&*node)) {
+        return fmt::format("P{}.x", static_cast<u64>(expr->predicate));
+    }
+    if (const auto expr = std::get_if<ExprCondCode>(&*node)) {
+        return Visit(ir.GetConditionCode(expr->cc));
+    }
+    if (const auto expr = std::get_if<ExprVar>(&*node)) {
+        return fmt::format("F{}.x", expr->var_index);
+    }
+    if (const auto expr = std::get_if<ExprBoolean>(&*node)) {
+        return expr->value ? "0xffffffff" : "0";
+    }
+    if (const auto expr = std::get_if<ExprGprEqual>(&*node)) {
+        const std::string result = AllocTemporary();
+        AddLine("SEQ.U {}, R{}.x, {};", result, expr->gpr, expr->value);
+        return result;
+    }
+    UNREACHABLE();
+    return "0";
+}
+
+void ARBDecompiler::VisitBlock(const NodeBlock& bb) {
+    for (const auto& node : bb) {
+        Visit(node);
+    }
+}
+
+std::string ARBDecompiler::Visit(const Node& node) {
+    if (const auto operation = std::get_if<OperationNode>(&*node)) {
+        if (const auto amend_index = operation->GetAmendIndex()) {
+            Visit(ir.GetAmendNode(*amend_index));
+        }
+        const std::size_t index = static_cast<std::size_t>(operation->GetCode());
+        if (index >= OPERATION_DECOMPILERS.size()) {
+            UNREACHABLE_MSG("Out of bounds operation: {}", index);
+            return {};
+        }
+        const auto decompiler = OPERATION_DECOMPILERS[index];
+        if (decompiler == nullptr) {
+            UNREACHABLE_MSG("Undefined operation: {}", index);
+            return {};
+        }
+        return (this->*decompiler)(*operation);
+    }
+
+    if (const auto gpr = std::get_if<GprNode>(&*node)) {
+        const u32 index = gpr->GetIndex();
+        if (index == Register::ZeroIndex) {
+            return "{0, 0, 0, 0}.x";
+        }
+        return fmt::format("R{}.x", index);
+    }
+
+    if (const auto cv = std::get_if<CustomVarNode>(&*node)) {
+        return fmt::format("CV{}.x", cv->GetIndex());
+    }
+
+    if (const auto immediate = std::get_if<ImmediateNode>(&*node)) {
+        const std::string temporary = AllocTemporary();
+        AddLine("MOV.U {}, {};", temporary, immediate->GetValue());
+        return temporary;
+    }
+
+    if (const auto predicate = std::get_if<PredicateNode>(&*node)) {
+        const std::string temporary = AllocTemporary();
+        switch (const auto index = predicate->GetIndex(); index) {
+        case Tegra::Shader::Pred::UnusedIndex:
+            AddLine("MOV.S {}, -1;", temporary);
+            break;
+        case Tegra::Shader::Pred::NeverExecute:
+            AddLine("MOV.S {}, 0;", temporary);
+            break;
+        default:
+            AddLine("MOV.S {}, P{}.x;", temporary, static_cast<u64>(index));
+            break;
+        }
+        if (predicate->IsNegated()) {
+            AddLine("CMP.S {}, {}, 0, -1;", temporary, temporary);
+        }
+        return temporary;
+    }
+
+    if (const auto abuf = std::get_if<AbufNode>(&*node)) {
+        if (abuf->IsPhysicalBuffer()) {
+            UNIMPLEMENTED_MSG("Physical buffers are not implemented");
+            return "{0, 0, 0, 0}.x";
+        }
+
+        const auto buffer_index = [this, &abuf]() -> std::string {
+            if (stage != ShaderType::Geometry) {
+                return "";
+            }
+            return fmt::format("[{}]", Visit(abuf->GetBuffer()));
+        };
+
+        const Attribute::Index index = abuf->GetIndex();
+        const u32 element = abuf->GetElement();
+        const char swizzle = Swizzle(element);
+        switch (index) {
+        case Attribute::Index::Position: {
+            if (stage == ShaderType::Geometry) {
+                return fmt::format("{}_position[{}].{}", StageInputName(stage),
+                                   Visit(abuf->GetBuffer()), swizzle);
+            } else {
+                return fmt::format("{}.position.{}", StageInputName(stage), swizzle);
+            }
+        }
+        case Attribute::Index::TessCoordInstanceIDVertexID:
+            ASSERT(stage == ShaderType::Vertex);
+            switch (element) {
+            case 2:
+                return "vertex.instance";
+            case 3:
+                return "vertex.id";
+            }
+            UNIMPLEMENTED_MSG("Unmanaged TessCoordInstanceIDVertexID element={}", element);
+            break;
+        case Attribute::Index::PointCoord:
+            switch (element) {
+            case 0:
+                return "fragment.pointcoord.x";
+            case 1:
+                return "fragment.pointcoord.y";
+            }
+            UNIMPLEMENTED();
+            break;
+        case Attribute::Index::FrontFacing: {
+            ASSERT(stage == ShaderType::Fragment);
+            ASSERT(element == 3);
+            const std::string temporary = AllocVectorTemporary();
+            AddLine("SGT.S RC.x, fragment.facing, {{0, 0, 0, 0}};");
+            AddLine("MOV.U.CC RC.x, -RC;");
+            AddLine("MOV.S {}.x, 0;", temporary);
+            AddLine("MOV.S {}.x (NE.x), -1;", temporary);
+            return fmt::format("{}.x", temporary);
+        }
+        default:
+            if (IsGenericAttribute(index)) {
+                if (stage == ShaderType::Geometry) {
+                    return fmt::format("in_attr{}[{}][0].{}", GetGenericAttributeIndex(index),
+                                       Visit(abuf->GetBuffer()), swizzle);
+                } else {
+                    return fmt::format("{}.attrib[{}].{}", StageInputName(stage),
+                                       GetGenericAttributeIndex(index), swizzle);
+                }
+            }
+            UNIMPLEMENTED_MSG("Unimplemented input attribute={}", static_cast<int>(index));
+            break;
+        }
+        return "{0, 0, 0, 0}.x";
+    }
+
+    if (const auto cbuf = std::get_if<CbufNode>(&*node)) {
+        std::string offset_string;
+        const auto& offset = cbuf->GetOffset();
+        if (const auto imm = std::get_if<ImmediateNode>(&*offset)) {
+            offset_string = std::to_string(imm->GetValue());
+        } else {
+            offset_string = Visit(offset);
+        }
+        const std::string temporary = AllocTemporary();
+        AddLine("LDC.F32 {}, cbuf{}[{}];", temporary, cbuf->GetIndex(), offset_string);
+        return temporary;
+    }
+
+    if (const auto gmem = std::get_if<GmemNode>(&*node)) {
+        const std::string temporary = AllocTemporary();
+        AddLine("SUB.U {}, {}, {};", temporary, Visit(gmem->GetRealAddress()),
+                Visit(gmem->GetBaseAddress()));
+        AddLine("LDB.U32 {}, {}[{}];", temporary, GlobalMemoryName(gmem->GetDescriptor()),
+                temporary);
+        return temporary;
+    }
+
+    if (const auto lmem = std::get_if<LmemNode>(&*node)) {
+        const std::string temporary = Visit(lmem->GetAddress());
+        AddLine("SHR.U {}, {}, 2;", temporary, temporary);
+        AddLine("MOV.U {}, lmem[{}].x;", temporary, temporary);
+        return temporary;
+    }
+
+    if (const auto smem = std::get_if<SmemNode>(&*node)) {
+        const std::string temporary = Visit(smem->GetAddress());
+        AddLine("LDS.U32 {}, shared_mem[{}];", temporary, temporary);
+        return temporary;
+    }
+
+    if (const auto internal_flag = std::get_if<InternalFlagNode>(&*node)) {
+        const std::size_t index = static_cast<std::size_t>(internal_flag->GetFlag());
+        return fmt::format("{}.x", INTERNAL_FLAG_NAMES[index]);
+    }
+
+    if (const auto conditional = std::get_if<ConditionalNode>(&*node)) {
+        if (const auto amend_index = conditional->GetAmendIndex()) {
+            Visit(ir.GetAmendNode(*amend_index));
+        }
+        AddLine("MOVC.U RC.x, {};", Visit(conditional->GetCondition()));
+        AddLine("IF NE.x;");
+        VisitBlock(conditional->GetCode());
+        AddLine("ENDIF;");
+        return {};
+    }
+
+    if (const auto cmt = std::get_if<CommentNode>(&*node)) {
+        // Uncommenting this will generate invalid code. GLASM lacks comments.
+        // AddLine("// {}", cmt->GetText());
+        return {};
+    }
+
+    UNIMPLEMENTED();
+    return {};
+}
+
+std::pair<std::string, std::size_t> ARBDecompiler::BuildCoords(Operation operation) {
+    const auto& meta = std::get<MetaTexture>(operation.GetMeta());
+    UNIMPLEMENTED_IF(meta.sampler.is_indexed);
+    UNIMPLEMENTED_IF(meta.sampler.is_shadow && meta.sampler.is_array &&
+                     meta.sampler.type == Tegra::Shader::TextureType::TextureCube);
+
+    const std::size_t count = operation.GetOperandsCount();
+    std::string temporary = AllocVectorTemporary();
+    std::size_t i = 0;
+    for (; i < count; ++i) {
+        AddLine("MOV.F {}.{}, {};", temporary, Swizzle(i), Visit(operation[i]));
+    }
+    if (meta.sampler.is_array) {
+        AddLine("I2F.S {}.{}, {};", temporary, Swizzle(i++), Visit(meta.array));
+    }
+    if (meta.sampler.is_shadow) {
+        AddLine("MOV.F {}.{}, {};", temporary, Swizzle(i++), Visit(meta.depth_compare));
+    }
+    return {std::move(temporary), i};
+}
+
+std::string ARBDecompiler::BuildAoffi(Operation operation) {
+    const auto& meta = std::get<MetaTexture>(operation.GetMeta());
+    if (meta.aoffi.empty()) {
+        return {};
+    }
+    const std::string temporary = AllocVectorTemporary();
+    std::size_t i = 0;
+    for (auto& node : meta.aoffi) {
+        AddLine("MOV.S {}.{}, {};", temporary, Swizzle(i++), Visit(node));
+    }
+    return fmt::format(", offset({})", temporary);
+}
+
+void ARBDecompiler::Exit() {
+    if (stage != ShaderType::Fragment) {
+        AddLine("RET;");
+        return;
+    }
+
+    const auto safe_get_register = [this](u32 reg) -> std::string {
+        // TODO(Rodrigo): Replace with contains once C++20 releases
+        const auto& used_registers = ir.GetRegisters();
+        if (used_registers.find(reg) != used_registers.end()) {
+            return fmt::format("R{}.x", reg);
+        }
+        return "{0, 0, 0, 0}.x";
+    };
+
+    const auto& header = ir.GetHeader();
+    u32 current_reg = 0;
+    for (u32 rt = 0; rt < Tegra::Engines::Maxwell3D::Regs::NumRenderTargets; ++rt) {
+        for (u32 component = 0; component < 4; ++component) {
+            if (!header.ps.IsColorComponentOutputEnabled(rt, component)) {
+                continue;
+            }
+            AddLine("MOV.F result_color{}.{}, {};", rt, Swizzle(component),
+                    safe_get_register(current_reg));
+            ++current_reg;
+        }
+    }
+    if (header.ps.omap.depth) {
+        AddLine("MOV.F result.depth.z, {};", safe_get_register(current_reg + 1));
+    }
+
+    AddLine("RET;");
+}
+
+std::string ARBDecompiler::Assign(Operation operation) {
+    const Node& dest = operation[0];
+    const Node& src = operation[1];
+
+    std::string dest_name;
+    if (const auto gpr = std::get_if<GprNode>(&*dest)) {
+        if (gpr->GetIndex() == Register::ZeroIndex) {
+            // Writing to Register::ZeroIndex is a no op
+            return {};
+        }
+        dest_name = fmt::format("R{}.x", gpr->GetIndex());
+    } else if (const auto abuf = std::get_if<AbufNode>(&*dest)) {
+        const u32 element = abuf->GetElement();
+        const char swizzle = Swizzle(element);
+        switch (const Attribute::Index index = abuf->GetIndex()) {
+        case Attribute::Index::Position:
+            dest_name = fmt::format("result.position.{}", swizzle);
+            break;
+        case Attribute::Index::LayerViewportPointSize:
+            switch (element) {
+            case 0:
+                UNIMPLEMENTED();
+                return {};
+            case 1:
+            case 2:
+                if (!device.HasNvViewportArray2()) {
+                    LOG_ERROR(
+                        Render_OpenGL,
+                        "NV_viewport_array2 is missing. Maxwell gen 2 or better is required.");
+                    return {};
+                }
+                dest_name = element == 1 ? "result.layer.x" : "result.viewport.x";
+                break;
+            case 3:
+                dest_name = "result.pointsize.x";
+                break;
+            }
+            break;
+        case Attribute::Index::ClipDistances0123:
+            dest_name = fmt::format("result.clip[{}].x", element);
+            break;
+        case Attribute::Index::ClipDistances4567:
+            dest_name = fmt::format("result.clip[{}].x", element + 4);
+            break;
+        default:
+            if (!IsGenericAttribute(index)) {
+                UNREACHABLE();
+                return {};
+            }
+            dest_name =
+                fmt::format("result.attrib[{}].{}", GetGenericAttributeIndex(index), swizzle);
+            break;
+        }
+    } else if (const auto lmem = std::get_if<LmemNode>(&*dest)) {
+        const std::string address = Visit(lmem->GetAddress());
+        AddLine("SHR.U {}, {}, 2;", address, address);
+        dest_name = fmt::format("lmem[{}].x", address);
+    } else if (const auto smem = std::get_if<SmemNode>(&*dest)) {
+        AddLine("STS.U32 {}, shared_mem[{}];", Visit(src), Visit(smem->GetAddress()));
+        ResetTemporaries();
+        return {};
+    } else if (const auto gmem = std::get_if<GmemNode>(&*dest)) {
+        const std::string temporary = AllocTemporary();
+        AddLine("SUB.U {}, {}, {};", temporary, Visit(gmem->GetRealAddress()),
+                Visit(gmem->GetBaseAddress()));
+        AddLine("STB.U32 {}, {}[{}];", Visit(src), GlobalMemoryName(gmem->GetDescriptor()),
+                temporary);
+        ResetTemporaries();
+        return {};
+    } else {
+        UNREACHABLE();
+        ResetTemporaries();
+        return {};
+    }
+
+    AddLine("MOV.U {}, {};", dest_name, Visit(src));
+    ResetTemporaries();
+    return {};
+}
+
+std::string ARBDecompiler::Select(Operation operation) {
+    const std::string temporary = AllocTemporary();
+    AddLine("CMP.S {}, {}, {}, {};", temporary, Visit(operation[0]), Visit(operation[1]),
+            Visit(operation[2]));
+    return temporary;
+}
+
+std::string ARBDecompiler::FClamp(Operation operation) {
+    // 1.0f in hex, replace with std::bit_cast on C++20
+    static constexpr u32 POSITIVE_ONE = 0x3f800000;
+
+    const std::string temporary = AllocTemporary();
+    const Node& value = operation[0];
+    const Node& low = operation[1];
+    const Node& high = operation[2];
+    const auto imm_low = std::get_if<ImmediateNode>(&*low);
+    const auto imm_high = std::get_if<ImmediateNode>(&*high);
+    if (imm_low && imm_high && imm_low->GetValue() == 0 && imm_high->GetValue() == POSITIVE_ONE) {
+        AddLine("MOV.F32.SAT {}, {};", temporary, Visit(value));
+    } else {
+        AddLine("MIN.F {}, {}, {};", temporary, Visit(value), Visit(high));
+        AddLine("MAX.F {}, {}, {};", temporary, temporary, Visit(low));
+    }
+    return temporary;
+}
+
+std::string ARBDecompiler::FCastHalf0(Operation operation) {
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("UP2H.F {}.x, {};", temporary, Visit(operation[0]));
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::FCastHalf1(Operation operation) {
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("UP2H.F {}.y, {};", temporary, Visit(operation[0]));
+    AddLine("MOV {}.x, {}.y;", temporary, temporary);
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::FSqrt(Operation operation) {
+    const std::string temporary = AllocTemporary();
+    AddLine("RSQ.F32 {}, {};", temporary, Visit(operation[0]));
+    AddLine("RCP.F32 {}, {};", temporary, temporary);
+    return temporary;
+}
+
+std::string ARBDecompiler::FSwizzleAdd(Operation operation) {
+    LOG_WARNING(Render_OpenGL, "(STUBBED)");
+    const std::string temporary = AllocTemporary();
+    AddLine("ADD.F {}, {}, {};", temporary, Visit(operation[0]), Visit(operation[1]));
+    return temporary;
+}
+
+std::string ARBDecompiler::HAdd2(Operation operation) {
+    const std::string tmp1 = AllocVectorTemporary();
+    const std::string tmp2 = AllocVectorTemporary();
+    AddLine("UP2H.F {}.xy, {};", tmp1, Visit(operation[0]));
+    AddLine("UP2H.F {}.xy, {};", tmp2, Visit(operation[1]));
+    AddLine("ADD.F16 {}, {}, {};", tmp1, tmp1, tmp2);
+    AddLine("PK2H.F {}.x, {};", tmp1, tmp1);
+    return fmt::format("{}.x", tmp1);
+}
+
+std::string ARBDecompiler::HMul2(Operation operation) {
+    const std::string tmp1 = AllocVectorTemporary();
+    const std::string tmp2 = AllocVectorTemporary();
+    AddLine("UP2H.F {}.xy, {};", tmp1, Visit(operation[0]));
+    AddLine("UP2H.F {}.xy, {};", tmp2, Visit(operation[1]));
+    AddLine("MUL.F16 {}, {}, {};", tmp1, tmp1, tmp2);
+    AddLine("PK2H.F {}.x, {};", tmp1, tmp1);
+    return fmt::format("{}.x", tmp1);
+}
+
+std::string ARBDecompiler::HFma2(Operation operation) {
+    const std::string tmp1 = AllocVectorTemporary();
+    const std::string tmp2 = AllocVectorTemporary();
+    const std::string tmp3 = AllocVectorTemporary();
+    AddLine("UP2H.F {}.xy, {};", tmp1, Visit(operation[0]));
+    AddLine("UP2H.F {}.xy, {};", tmp2, Visit(operation[1]));
+    AddLine("UP2H.F {}.xy, {};", tmp3, Visit(operation[2]));
+    AddLine("MAD.F16 {}, {}, {}, {};", tmp1, tmp1, tmp2, tmp3);
+    AddLine("PK2H.F {}.x, {};", tmp1, tmp1);
+    return fmt::format("{}.x", tmp1);
+}
+
+std::string ARBDecompiler::HAbsolute(Operation operation) {
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("UP2H.F {}.xy, {};", temporary, Visit(operation[0]));
+    AddLine("PK2H.F {}.x, |{}|;", temporary, temporary);
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::HNegate(Operation operation) {
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("UP2H.F {}.xy, {};", temporary, Visit(operation[0]));
+    AddLine("MOVC.S RC.x, {};", Visit(operation[1]));
+    AddLine("MOV.F {}.x (NE.x), -{}.x;", temporary, temporary);
+    AddLine("MOVC.S RC.x, {};", Visit(operation[2]));
+    AddLine("MOV.F {}.y (NE.x), -{}.y;", temporary, temporary);
+    AddLine("PK2H.F {}.x, {};", temporary, temporary);
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::HClamp(Operation operation) {
+    const std::string tmp1 = AllocVectorTemporary();
+    const std::string tmp2 = AllocVectorTemporary();
+    AddLine("UP2H.F {}.xy, {};", tmp1, Visit(operation[0]));
+    AddLine("MOV.U {}.x, {};", tmp2, Visit(operation[1]));
+    AddLine("MOV.U {}.y, {}.x;", tmp2, tmp2);
+    AddLine("MAX.F {}, {}, {};", tmp1, tmp1, tmp2);
+    AddLine("MOV.U {}.x, {};", tmp2, Visit(operation[2]));
+    AddLine("MOV.U {}.y, {}.x;", tmp2, tmp2);
+    AddLine("MIN.F {}, {}, {};", tmp1, tmp1, tmp2);
+    AddLine("PK2H.F {}.x, {};", tmp1, tmp1);
+    return fmt::format("{}.x", tmp1);
+}
+
+std::string ARBDecompiler::HCastFloat(Operation operation) {
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("MOV.F {}.y, {{0, 0, 0, 0}};", temporary);
+    AddLine("MOV.F {}.x, {};", temporary, Visit(operation[0]));
+    AddLine("PK2H.F {}.x, {};", temporary, temporary);
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::HUnpack(Operation operation) {
+    const std::string operand = Visit(operation[0]);
+    switch (std::get<Tegra::Shader::HalfType>(operation.GetMeta())) {
+    case Tegra::Shader::HalfType::H0_H1:
+        return operand;
+    case Tegra::Shader::HalfType::F32: {
+        const std::string temporary = AllocVectorTemporary();
+        AddLine("MOV.U {}.x, {};", temporary, operand);
+        AddLine("MOV.U {}.y, {}.x;", temporary, temporary);
+        AddLine("PK2H.F {}.x, {};", temporary, temporary);
+        return fmt::format("{}.x", temporary);
+    }
+    case Tegra::Shader::HalfType::H0_H0: {
+        const std::string temporary = AllocVectorTemporary();
+        AddLine("UP2H.F {}.xy, {};", temporary, operand);
+        AddLine("MOV.U {}.y, {}.x;", temporary, temporary);
+        AddLine("PK2H.F {}.x, {};", temporary, temporary);
+        return fmt::format("{}.x", temporary);
+    }
+    case Tegra::Shader::HalfType::H1_H1: {
+        const std::string temporary = AllocVectorTemporary();
+        AddLine("UP2H.F {}.xy, {};", temporary, operand);
+        AddLine("MOV.U {}.x, {}.y;", temporary, temporary);
+        AddLine("PK2H.F {}.x, {};", temporary, temporary);
+        return fmt::format("{}.x", temporary);
+    }
+    }
+    UNREACHABLE();
+    return "{0, 0, 0, 0}.x";
+}
+
+std::string ARBDecompiler::HMergeF32(Operation operation) {
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("UP2H.F {}.xy, {};", temporary, Visit(operation[0]));
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::HMergeH0(Operation operation) {
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("UP2H.F {}.xy, {};", temporary, Visit(operation[0]));
+    AddLine("UP2H.F {}.zw, {};", temporary, Visit(operation[1]));
+    AddLine("MOV.U {}.x, {}.z;", temporary, temporary);
+    AddLine("PK2H.F {}.x, {};", temporary, temporary);
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::HMergeH1(Operation operation) {
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("UP2H.F {}.xy, {};", temporary, Visit(operation[0]));
+    AddLine("UP2H.F {}.zw, {};", temporary, Visit(operation[1]));
+    AddLine("MOV.U {}.y, {}.w;", temporary, temporary);
+    AddLine("PK2H.F {}.x, {};", temporary, temporary);
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::HPack2(Operation operation) {
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("MOV.U {}.x, {};", temporary, Visit(operation[0]));
+    AddLine("MOV.U {}.y, {};", temporary, Visit(operation[1]));
+    AddLine("PK2H.F {}.x, {};", temporary, temporary);
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::LogicalAssign(Operation operation) {
+    const Node& dest = operation[0];
+    const Node& src = operation[1];
+
+    std::string target;
+
+    if (const auto pred = std::get_if<PredicateNode>(&*dest)) {
+        ASSERT_MSG(!pred->IsNegated(), "Negating logical assignment");
+
+        const Tegra::Shader::Pred index = pred->GetIndex();
+        switch (index) {
+        case Tegra::Shader::Pred::NeverExecute:
+        case Tegra::Shader::Pred::UnusedIndex:
+            // Writing to these predicates is a no-op
+            return {};
+        }
+        target = fmt::format("P{}.x", static_cast<u64>(index));
+    } else if (const auto internal_flag = std::get_if<InternalFlagNode>(&*dest)) {
+        const std::size_t index = static_cast<std::size_t>(internal_flag->GetFlag());
+        target = fmt::format("{}.x", INTERNAL_FLAG_NAMES[index]);
+    } else {
+        UNREACHABLE();
+        ResetTemporaries();
+        return {};
+    }
+
+    AddLine("MOV.U {}, {};", target, Visit(src));
+    ResetTemporaries();
+    return {};
+}
+
+std::string ARBDecompiler::LogicalPick2(Operation operation) {
+    const std::string temporary = AllocTemporary();
+    const u32 index = std::get<ImmediateNode>(*operation[1]).GetValue();
+    AddLine("MOV.U {}, {}.{};", temporary, Visit(operation[0]), Swizzle(index));
+    return temporary;
+}
+
+std::string ARBDecompiler::LogicalAnd2(Operation operation) {
+    const std::string temporary = AllocTemporary();
+    const std::string op = Visit(operation[0]);
+    AddLine("AND.U {}, {}.x, {}.y;", temporary, op, op);
+    return temporary;
+}
+
+std::string ARBDecompiler::FloatOrdered(Operation operation) {
+    const std::string temporary = AllocTemporary();
+    AddLine("MOVC.F32 RC.x, {};", Visit(operation[0]));
+    AddLine("MOVC.F32 RC.y, {};", Visit(operation[1]));
+    AddLine("MOV.S {}, -1;", temporary);
+    AddLine("MOV.S {} (NAN.x), 0;", temporary);
+    AddLine("MOV.S {} (NAN.y), 0;", temporary);
+    return temporary;
+}
+
+std::string ARBDecompiler::FloatUnordered(Operation operation) {
+    const std::string temporary = AllocTemporary();
+    AddLine("MOVC.F32 RC.x, {};", Visit(operation[0]));
+    AddLine("MOVC.F32 RC.y, {};", Visit(operation[1]));
+    AddLine("MOV.S {}, 0;", temporary);
+    AddLine("MOV.S {} (NAN.x), -1;", temporary);
+    AddLine("MOV.S {} (NAN.y), -1;", temporary);
+    return temporary;
+}
+
+std::string ARBDecompiler::LogicalAddCarry(Operation operation) {
+    const std::string temporary = AllocTemporary();
+    AddLine("ADDC.U RC, {}, {};", Visit(operation[0]), Visit(operation[1]));
+    AddLine("MOV.S {}, 0;", temporary);
+    AddLine("IF CF.x;");
+    AddLine("MOV.S {}, -1;", temporary);
+    AddLine("ENDIF;");
+    return temporary;
+}
+
+std::string ARBDecompiler::Texture(Operation operation) {
+    const auto& meta = std::get<MetaTexture>(operation.GetMeta());
+    const u32 sampler_id = device.GetBaseBindings(stage).sampler + meta.sampler.index;
+    const auto [temporary, swizzle] = BuildCoords(operation);
+
+    std::string_view opcode = "TEX";
+    std::string extra;
+    if (meta.bias) {
+        ASSERT(!meta.lod);
+        opcode = "TXB";
+
+        if (swizzle < 4) {
+            AddLine("MOV.F {}.w, {};", temporary, Visit(meta.bias));
+        } else {
+            const std::string bias = AllocTemporary();
+            AddLine("MOV.F {}, {};", bias, Visit(meta.bias));
+            extra = fmt::format(" {},", bias);
+        }
+    }
+    if (meta.lod) {
+        ASSERT(!meta.bias);
+        opcode = "TXL";
+
+        if (swizzle < 4) {
+            AddLine("MOV.F {}.w, {};", temporary, Visit(meta.lod));
+        } else {
+            const std::string lod = AllocTemporary();
+            AddLine("MOV.F {}, {};", lod, Visit(meta.lod));
+            extra = fmt::format(" {},", lod);
+        }
+    }
+
+    AddLine("{}.F {}, {},{} texture[{}], {}{};", opcode, temporary, temporary, extra, sampler_id,
+            TextureType(meta), BuildAoffi(operation));
+    AddLine("MOV.U {}.x, {}.{};", temporary, temporary, Swizzle(meta.element));
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::TextureGather(Operation operation) {
+    const auto& meta = std::get<MetaTexture>(operation.GetMeta());
+    const u32 sampler_id = device.GetBaseBindings(stage).sampler + meta.sampler.index;
+    const auto [temporary, swizzle] = BuildCoords(operation);
+
+    std::string comp;
+    if (!meta.sampler.is_shadow) {
+        const auto& immediate = std::get<ImmediateNode>(*meta.component);
+        comp = fmt::format(".{}", Swizzle(immediate.GetValue()));
+    }
+
+    AddLine("TXG.F {}, {}, texture[{}]{}, {}{};", temporary, temporary, sampler_id, comp,
+            TextureType(meta), BuildAoffi(operation));
+    AddLine("MOV.U {}.x, {}.{};", temporary, temporary, Swizzle(meta.element));
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::TextureQueryDimensions(Operation operation) {
+    const auto& meta = std::get<MetaTexture>(operation.GetMeta());
+    const std::string temporary = AllocVectorTemporary();
+    const u32 sampler_id = device.GetBaseBindings(stage).sampler + meta.sampler.index;
+
+    ASSERT(!meta.sampler.is_array);
+
+    const std::string lod = operation.GetOperandsCount() > 0 ? Visit(operation[0]) : "0";
+    AddLine("TXQ {}, {}, texture[{}], {};", temporary, lod, sampler_id, TextureType(meta));
+    AddLine("MOV.U {}.x, {}.{};", temporary, temporary, Swizzle(meta.element));
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::TextureQueryLod(Operation operation) {
+    const auto& meta = std::get<MetaTexture>(operation.GetMeta());
+    const std::string temporary = AllocVectorTemporary();
+    const u32 sampler_id = device.GetBaseBindings(stage).sampler + meta.sampler.index;
+
+    ASSERT(!meta.sampler.is_array);
+
+    const std::size_t count = operation.GetOperandsCount();
+    for (std::size_t i = 0; i < count; ++i) {
+        AddLine("MOV.F {}.{}, {};", temporary, Swizzle(i), Visit(operation[i]));
+    }
+    AddLine("LOD.F {}, {}, texture[{}], {};", temporary, temporary, sampler_id, TextureType(meta));
+    AddLine("MUL.F32 {}, {}, {{256, 256, 0, 0}};", temporary, temporary);
+    AddLine("TRUNC.S {}, {};", temporary, temporary);
+    AddLine("MOV.U {}.x, {}.{};", temporary, temporary, Swizzle(meta.element));
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::TexelFetch(Operation operation) {
+    const auto& meta = std::get<MetaTexture>(operation.GetMeta());
+    const u32 sampler_id = device.GetBaseBindings(stage).sampler + meta.sampler.index;
+    const auto [temporary, swizzle] = BuildCoords(operation);
+
+    if (!meta.sampler.is_buffer) {
+        ASSERT(swizzle < 4);
+        AddLine("MOV.F {}.w, {};", temporary, Visit(meta.lod));
+    }
+    AddLine("TXF.F {}, {}, texture[{}], {}{};", temporary, temporary, sampler_id, TextureType(meta),
+            BuildAoffi(operation));
+    AddLine("MOV.U {}.x, {}.{};", temporary, temporary, Swizzle(meta.element));
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::TextureGradient(Operation operation) {
+    const auto& meta = std::get<MetaTexture>(operation.GetMeta());
+    const u32 sampler_id = device.GetBaseBindings(stage).sampler + meta.sampler.index;
+    const std::string ddx = AllocVectorTemporary();
+    const std::string ddy = AllocVectorTemporary();
+    const std::string coord = BuildCoords(operation).first;
+
+    const std::size_t num_components = meta.derivates.size() / 2;
+    for (std::size_t index = 0; index < num_components; ++index) {
+        const char swizzle = Swizzle(index);
+        AddLine("MOV.F {}.{}, {};", ddx, swizzle, Visit(meta.derivates[index * 2]));
+        AddLine("MOV.F {}.{}, {};", ddy, swizzle, Visit(meta.derivates[index * 2 + 1]));
+    }
+
+    const std::string_view result = coord;
+    AddLine("TXD.F {}, {}, {}, {}, texture[{}], {}{};", result, coord, ddx, ddy, sampler_id,
+            TextureType(meta), BuildAoffi(operation));
+    AddLine("MOV.F {}.x, {}.{};", result, result, Swizzle(meta.element));
+    return fmt::format("{}.x", result);
+}
+
+std::string ARBDecompiler::ImageLoad(Operation operation) {
+    const auto& meta = std::get<MetaImage>(operation.GetMeta());
+    const u32 image_id = device.GetBaseBindings(stage).image + meta.image.index;
+    const std::size_t count = operation.GetOperandsCount();
+    const std::string_view type = ImageType(meta.image.type);
+
+    const std::string temporary = AllocVectorTemporary();
+    for (std::size_t i = 0; i < count; ++i) {
+        AddLine("MOV.S {}.{}, {};", temporary, Swizzle(i), Visit(operation[i]));
+    }
+    AddLine("LOADIM.F {}, {}, image[{}], {};", temporary, temporary, image_id, type);
+    AddLine("MOV.F {}.x, {}.{};", temporary, temporary, Swizzle(meta.element));
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::ImageStore(Operation operation) {
+    const auto& meta = std::get<MetaImage>(operation.GetMeta());
+    const u32 image_id = device.GetBaseBindings(stage).image + meta.image.index;
+    const std::size_t num_coords = operation.GetOperandsCount();
+    const std::size_t num_values = meta.values.size();
+    const std::string_view type = ImageType(meta.image.type);
+
+    const std::string coord = AllocVectorTemporary();
+    const std::string value = AllocVectorTemporary();
+    for (std::size_t i = 0; i < num_coords; ++i) {
+        AddLine("MOV.S {}.{}, {};", coord, Swizzle(i), Visit(operation[i]));
+    }
+    for (std::size_t i = 0; i < num_values; ++i) {
+        AddLine("MOV.F {}.{}, {};", value, Swizzle(i), Visit(meta.values[i]));
+    }
+    AddLine("STOREIM.F image[{}], {}, {}, {};", image_id, value, coord, type);
+    return {};
+}
+
+std::string ARBDecompiler::Branch(Operation operation) {
+    const auto target = std::get<ImmediateNode>(*operation[0]);
+    AddLine("MOV.U PC.x, {};", target.GetValue());
+    AddLine("CONT;");
+    return {};
+}
+
+std::string ARBDecompiler::BranchIndirect(Operation operation) {
+    AddLine("MOV.U PC.x, {};", Visit(operation[0]));
+    AddLine("CONT;");
+    return {};
+}
+
+std::string ARBDecompiler::PushFlowStack(Operation operation) {
+    const auto stack = std::get<MetaStackClass>(operation.GetMeta());
+    const u32 target = std::get<ImmediateNode>(*operation[0]).GetValue();
+    const std::string_view stack_name = StackName(stack);
+    AddLine("MOV.U {}[{}_TOP.x].x, {};", stack_name, stack_name, target);
+    AddLine("ADD.S {}_TOP.x, {}_TOP.x, 1;", stack_name, stack_name);
+    return {};
+}
+
+std::string ARBDecompiler::PopFlowStack(Operation operation) {
+    const auto stack = std::get<MetaStackClass>(operation.GetMeta());
+    const std::string_view stack_name = StackName(stack);
+    AddLine("SUB.S {}_TOP.x, {}_TOP.x, 1;", stack_name, stack_name);
+    AddLine("MOV.U PC.x, {}[{}_TOP.x].x;", stack_name, stack_name);
+    AddLine("CONT;");
+    return {};
+}
+
+std::string ARBDecompiler::Exit(Operation) {
+    Exit();
+    return {};
+}
+
+std::string ARBDecompiler::Discard(Operation) {
+    AddLine("KIL TR;");
+    return {};
+}
+
+std::string ARBDecompiler::EmitVertex(Operation) {
+    AddLine("EMIT;");
+    return {};
+}
+
+std::string ARBDecompiler::EndPrimitive(Operation) {
+    AddLine("ENDPRIM;");
+    return {};
+}
+
+std::string ARBDecompiler::InvocationId(Operation) {
+    return "primitive.invocation";
+}
+
+std::string ARBDecompiler::YNegate(Operation) {
+    LOG_WARNING(Render_OpenGL, "(STUBBED)");
+    const std::string temporary = AllocTemporary();
+    AddLine("MOV.F {}, 1;", temporary);
+    return temporary;
+}
+
+std::string ARBDecompiler::ThreadId(Operation) {
+    return fmt::format("{}.threadid", StageInputName(stage));
+}
+
+std::string ARBDecompiler::ShuffleIndexed(Operation operation) {
+    if (!device.HasWarpIntrinsics()) {
+        LOG_ERROR(Render_OpenGL,
+                  "NV_shader_thread_shuffle is missing. Kepler or better is required.");
+        return Visit(operation[0]);
+    }
+    const std::string temporary = AllocVectorTemporary();
+    AddLine("SHFIDX.U {}, {}, {}, {{31, 0, 0, 0}};", temporary, Visit(operation[0]),
+            Visit(operation[1]));
+    AddLine("MOV.U {}.x, {}.y;", temporary, temporary);
+    return fmt::format("{}.x", temporary);
+}
+
+std::string ARBDecompiler::Barrier(Operation) {
+    if (!ir.IsDecompiled()) {
+        LOG_ERROR(Render_OpenGL, "BAR used but shader is not decompiled");
+        return {};
+    }
+    AddLine("BAR;");
+    return {};
+}
+
+std::string ARBDecompiler::MemoryBarrierGroup(Operation) {
+    AddLine("MEMBAR.CTA;");
+    return {};
+}
+
+std::string ARBDecompiler::MemoryBarrierGlobal(Operation) {
+    AddLine("MEMBAR;");
+    return {};
+}
+
+} // Anonymous namespace
+
+std::string DecompileAssemblyShader(const Device& device, const VideoCommon::Shader::ShaderIR& ir,
+                                    const VideoCommon::Shader::Registry& registry,
+                                    Tegra::Engines::ShaderType stage, std::string_view identifier) {
+    return ARBDecompiler(device, ir, registry, stage, identifier).Code();
+}
+
+} // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_arb_decompiler.h b/src/video_core/renderer_opengl/gl_arb_decompiler.h
new file mode 100644
index 000000000..6afc87220
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_arb_decompiler.h
@@ -0,0 +1,29 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <string_view>
+
+#include "common/common_types.h"
+
+namespace Tegra::Engines {
+enum class ShaderType : u32;
+}
+
+namespace VideoCommon::Shader {
+class ShaderIR;
+class Registry;
+} // namespace VideoCommon::Shader
+
+namespace OpenGL {
+
+class Device;
+
+std::string DecompileAssemblyShader(const Device& device, const VideoCommon::Shader::ShaderIR& ir,
+                                    const VideoCommon::Shader::Registry& registry,
+                                    Tegra::Engines::ShaderType stage, std::string_view identifier);
+
+} // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_device.cpp b/src/video_core/renderer_opengl/gl_device.cpp
index 890fc6c63..e245e27ec 100644
--- a/src/video_core/renderer_opengl/gl_device.cpp
+++ b/src/video_core/renderer_opengl/gl_device.cpp
@@ -213,6 +213,7 @@ Device::Device()
     has_component_indexing_bug = is_amd;
     has_precise_bug = TestPreciseBug();
     has_fast_buffer_sub_data = is_nvidia && !disable_fast_buffer_sub_data;
+    has_nv_viewport_array2 = GLAD_GL_NV_viewport_array2;
     use_assembly_shaders = Settings::values.use_assembly_shaders && GLAD_GL_NV_gpu_program5 &&
                            GLAD_GL_NV_compute_program5 && GLAD_GL_NV_transform_feedback &&
                            GLAD_GL_NV_transform_feedback2;
diff --git a/src/video_core/renderer_opengl/gl_device.h b/src/video_core/renderer_opengl/gl_device.h
index 98cca0254..145347943 100644
--- a/src/video_core/renderer_opengl/gl_device.h
+++ b/src/video_core/renderer_opengl/gl_device.h
@@ -88,6 +88,10 @@ public:
         return has_fast_buffer_sub_data;
     }
 
+    bool HasNvViewportArray2() const {
+        return has_nv_viewport_array2;
+    }
+
     bool UseAssemblyShaders() const {
         return use_assembly_shaders;
     }
@@ -111,6 +115,7 @@ private:
     bool has_component_indexing_bug{};
     bool has_precise_bug{};
     bool has_fast_buffer_sub_data{};
+    bool has_nv_viewport_array2{};
     bool use_assembly_shaders{};
 };
 
diff --git a/src/video_core/renderer_opengl/gl_shader_cache.cpp b/src/video_core/renderer_opengl/gl_shader_cache.cpp
index a991ca64a..f539a05e1 100644
--- a/src/video_core/renderer_opengl/gl_shader_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_cache.cpp
@@ -20,6 +20,7 @@
 #include "video_core/engines/maxwell_3d.h"
 #include "video_core/engines/shader_type.h"
 #include "video_core/memory_manager.h"
+#include "video_core/renderer_opengl/gl_arb_decompiler.h"
 #include "video_core/renderer_opengl/gl_rasterizer.h"
 #include "video_core/renderer_opengl/gl_shader_cache.h"
 #include "video_core/renderer_opengl/gl_shader_decompiler.h"
@@ -147,7 +148,8 @@ ProgramSharedPtr BuildShader(const Device& device, ShaderType shader_type, u64 u
     auto program = std::make_shared<ProgramHandle>();
 
     if (device.UseAssemblyShaders()) {
-        const std::string arb = "Not implemented";
+        const std::string arb =
+            DecompileAssemblyShader(device, ir, registry, shader_type, shader_id);
 
         GLuint& arb_prog = program->assembly_program.handle;