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fixed_pipeline_state: Hash and compare the whole structure
Pad FixedPipelineState's size to 384 bytes to be a multiple of 16. Compare the whole struct with std::memcmp and hash with CityHash. Using CityHash instead of a naive hash should reduce the number of collisions. Improve used type traits to ensure this operation is safe. With these changes the improvements to the hashable pipeline state are: Optimized structure Hash: 89 ns Comparison: 103 ns Construction*: 164 ns Struct size: 384 bytes Original structure Hash: 148 ns Equal: 174 ns Construction*: 281 ns Size: 1384 bytes * Attribute state initialization is not measured These measures are averages taken with std::chrono::high_accuracy_clock on MSVC shipped on Visual Studio 16.6.0 Preview 2.1.
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@ -140,66 +140,13 @@ void FixedPipelineState::BlendingAttachment::Fill(const Maxwell& regs, std::size
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enable.Assign(1);
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}
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std::size_t FixedPipelineState::BlendingAttachment::Hash() const noexcept {
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return raw;
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}
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bool FixedPipelineState::BlendingAttachment::operator==(const BlendingAttachment& rhs) const
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noexcept {
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return raw == rhs.raw;
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}
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std::size_t FixedPipelineState::VertexInput::Hash() const noexcept {
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// TODO(Rodrigo): Replace this
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return Common::CityHash64(reinterpret_cast<const char*>(this), sizeof *this);
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}
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bool FixedPipelineState::VertexInput::operator==(const VertexInput& rhs) const noexcept {
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return std::memcmp(this, &rhs, sizeof *this) == 0;
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}
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std::size_t FixedPipelineState::Rasterizer::Hash() const noexcept {
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u64 hash = static_cast<u64>(raw) << 32;
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std::memcpy(&hash, &point_size, sizeof(u32));
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std::size_t FixedPipelineState::Hash() const noexcept {
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const u64 hash = Common::CityHash64(reinterpret_cast<const char*>(this), sizeof *this);
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return static_cast<std::size_t>(hash);
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}
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bool FixedPipelineState::Rasterizer::operator==(const Rasterizer& rhs) const noexcept {
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return raw == rhs.raw && point_size == rhs.point_size;
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}
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std::size_t FixedPipelineState::DepthStencil::Hash() const noexcept {
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return raw;
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}
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bool FixedPipelineState::DepthStencil::operator==(const DepthStencil& rhs) const noexcept {
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return raw == rhs.raw;
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}
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std::size_t FixedPipelineState::ColorBlending::Hash() const noexcept {
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std::size_t hash = 0;
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for (std::size_t rt = 0; rt < std::size(attachments); ++rt) {
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boost::hash_combine(hash, attachments[rt].Hash());
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}
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return hash;
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}
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bool FixedPipelineState::ColorBlending::operator==(const ColorBlending& rhs) const noexcept {
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return attachments == rhs.attachments;
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}
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std::size_t FixedPipelineState::Hash() const noexcept {
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std::size_t hash = 0;
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boost::hash_combine(hash, vertex_input.Hash());
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boost::hash_combine(hash, rasterizer.Hash());
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boost::hash_combine(hash, depth_stencil.Hash());
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boost::hash_combine(hash, color_blending.Hash());
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return hash;
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}
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bool FixedPipelineState::operator==(const FixedPipelineState& rhs) const noexcept {
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return std::tie(vertex_input, rasterizer, depth_stencil, color_blending) ==
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std::tie(rhs.vertex_input, rhs.rasterizer, rhs.depth_stencil, rhs.color_blending);
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return std::memcmp(this, &rhs, sizeof *this) == 0;
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}
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FixedPipelineState GetFixedPipelineState(const Maxwell& regs) {
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@ -207,6 +154,7 @@ FixedPipelineState GetFixedPipelineState(const Maxwell& regs) {
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fixed_state.rasterizer.Fill(regs);
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fixed_state.depth_stencil.Fill(regs);
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fixed_state.color_blending.Fill(regs);
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fixed_state.padding = {};
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return fixed_state;
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}
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@ -17,13 +17,7 @@ namespace Vulkan {
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using Maxwell = Tegra::Engines::Maxwell3D::Regs;
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// TODO(Rodrigo): Optimize this structure.
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template <class T>
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inline constexpr bool IsHashable = std::has_unique_object_representations_v<T>&&
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std::is_trivially_copyable_v<T>&& std::is_trivially_constructible_v<T>;
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struct FixedPipelineState {
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struct alignas(32) FixedPipelineState {
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static u32 PackComparisonOp(Maxwell::ComparisonOp op) noexcept;
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static Maxwell::ComparisonOp UnpackComparisonOp(u32 packed) noexcept;
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@ -102,7 +96,6 @@ struct FixedPipelineState {
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return UnpackBlendFactor(factor_dest_a.Value());
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}
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};
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static_assert(IsHashable<BlendingAttachment>);
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struct VertexInput {
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union Binding {
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@ -151,16 +144,7 @@ struct FixedPipelineState {
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attribute.type.Assign(static_cast<u32>(type));
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attribute.size.Assign(static_cast<u32>(size));
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}
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std::size_t Hash() const noexcept;
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bool operator==(const VertexInput& rhs) const noexcept;
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bool operator!=(const VertexInput& rhs) const noexcept {
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return !operator==(rhs);
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}
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};
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static_assert(IsHashable<VertexInput>);
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struct Rasterizer {
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union {
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@ -187,14 +171,6 @@ struct FixedPipelineState {
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void Fill(const Maxwell& regs) noexcept;
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std::size_t Hash() const noexcept;
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bool operator==(const Rasterizer& rhs) const noexcept;
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bool operator!=(const Rasterizer& rhs) const noexcept {
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return !operator==(rhs);
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}
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constexpr Maxwell::PrimitiveTopology Topology() const noexcept {
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return static_cast<Maxwell::PrimitiveTopology>(topology.Value());
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}
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@ -207,7 +183,6 @@ struct FixedPipelineState {
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return UnpackFrontFace(front_face.Value());
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}
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};
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static_assert(IsHashable<Rasterizer>);
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struct DepthStencil {
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template <std::size_t Position>
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@ -247,39 +222,22 @@ struct FixedPipelineState {
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void Fill(const Maxwell& regs) noexcept;
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std::size_t Hash() const noexcept;
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bool operator==(const DepthStencil& rhs) const noexcept;
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bool operator!=(const DepthStencil& rhs) const noexcept {
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return !operator==(rhs);
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}
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Maxwell::ComparisonOp DepthTestFunc() const noexcept {
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return UnpackComparisonOp(depth_test_func);
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}
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};
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static_assert(IsHashable<DepthStencil>);
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struct ColorBlending {
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std::array<BlendingAttachment, Maxwell::NumRenderTargets> attachments;
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void Fill(const Maxwell& regs) noexcept;
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std::size_t Hash() const noexcept;
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bool operator==(const ColorBlending& rhs) const noexcept;
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bool operator!=(const ColorBlending& rhs) const noexcept {
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return !operator==(rhs);
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}
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};
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static_assert(IsHashable<ColorBlending>);
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VertexInput vertex_input;
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Rasterizer rasterizer;
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DepthStencil depth_stencil;
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ColorBlending color_blending;
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std::array<u8, 20> padding;
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std::size_t Hash() const noexcept;
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@ -289,12 +247,10 @@ struct FixedPipelineState {
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return !operator==(rhs);
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}
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};
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static_assert(std::is_trivially_copyable_v<FixedPipelineState::BlendingAttachment>);
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static_assert(std::is_trivially_copyable_v<FixedPipelineState::VertexInput>);
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static_assert(std::is_trivially_copyable_v<FixedPipelineState::Rasterizer>);
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static_assert(std::is_trivially_copyable_v<FixedPipelineState::DepthStencil>);
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static_assert(std::is_trivially_copyable_v<FixedPipelineState::ColorBlending>);
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static_assert(std::has_unique_object_representations_v<FixedPipelineState>);
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static_assert(std::is_trivially_copyable_v<FixedPipelineState>);
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static_assert(std::is_trivially_constructible_v<FixedPipelineState>);
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static_assert(sizeof(FixedPipelineState) % 32 == 0, "Size is not aligned");
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FixedPipelineState GetFixedPipelineState(const Maxwell& regs);
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