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shader: Rework global memory tracking to use breadth-first search
This commit is contained in:
ReinUsesLisp
ameerj
parent
c4aab5c40e
commit
9a342f5605
@ -4,9 +4,9 @@
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#include <algorithm>
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#include <compare>
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#include <map>
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#include <optional>
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#include <ranges>
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#include <queue>
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#include <boost/container/flat_set.hpp>
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#include <boost/container/small_vector.hpp>
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@ -40,15 +40,19 @@ struct Bias {
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u32 offset_end;
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};
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using boost::container::flat_set;
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using boost::container::small_vector;
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using StorageBufferSet =
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boost::container::flat_set<StorageBufferAddr, std::less<StorageBufferAddr>,
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boost::container::small_vector<StorageBufferAddr, 16>>;
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using StorageInstVector = boost::container::small_vector<StorageInst, 24>;
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using VisitedBlocks = boost::container::flat_set<IR::Block*, std::less<IR::Block*>,
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boost::container::small_vector<IR::Block*, 4>>;
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flat_set<StorageBufferAddr, std::less<StorageBufferAddr>, small_vector<StorageBufferAddr, 16>>;
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using StorageInstVector = small_vector<StorageInst, 24>;
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using StorageWritesSet =
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boost::container::flat_set<StorageBufferAddr, std::less<StorageBufferAddr>,
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boost::container::small_vector<StorageBufferAddr, 16>>;
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flat_set<StorageBufferAddr, std::less<StorageBufferAddr>, small_vector<StorageBufferAddr, 16>>;
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struct StorageInfo {
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StorageBufferSet set;
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StorageInstVector to_replace;
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StorageWritesSet writes;
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};
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/// Returns true when the instruction is a global memory instruction
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bool IsGlobalMemory(const IR::Inst& inst) {
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@ -215,60 +219,72 @@ std::optional<LowAddrInfo> TrackLowAddress(IR::Inst* inst) {
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};
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}
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/// Recursively tries to track the storage buffer address used by a global memory instruction
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std::optional<StorageBufferAddr> Track(IR::Block* block, const IR::Value& value, const Bias* bias,
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VisitedBlocks& visited) {
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if (value.IsImmediate()) {
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// Immediates can't be a storage buffer
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/// Tries to get the storage buffer out of a constant buffer read instruction
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std::optional<StorageBufferAddr> TryGetStorageBuffer(const IR::Inst* inst, const Bias* bias) {
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if (inst->Opcode() != IR::Opcode::GetCbufU32) {
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return std::nullopt;
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}
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const IR::Inst* const inst{value.InstRecursive()};
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if (inst->Opcode() == IR::Opcode::GetCbufU32) {
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const IR::Value index{inst->Arg(0)};
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const IR::Value offset{inst->Arg(1)};
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if (!index.IsImmediate()) {
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// Definitely not a storage buffer if it's read from a non-immediate index
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return std::nullopt;
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}
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if (!offset.IsImmediate()) {
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// TODO: Support SSBO arrays
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return std::nullopt;
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}
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const StorageBufferAddr storage_buffer{
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.index{index.U32()},
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.offset{offset.U32()},
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};
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if (bias && !MeetsBias(storage_buffer, *bias)) {
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// We have to blacklist some addresses in case we wrongly point to them
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return std::nullopt;
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}
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return storage_buffer;
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const IR::Value index{inst->Arg(0)};
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const IR::Value offset{inst->Arg(1)};
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if (!index.IsImmediate()) {
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// Definitely not a storage buffer if it's read from a non-immediate index
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return std::nullopt;
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}
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// Reversed loops are more likely to find the right result
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for (size_t arg = inst->NumArgs(); arg--;) {
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IR::Block* inst_block{block};
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if (inst->Opcode() == IR::Opcode::Phi) {
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// If we are going through a phi node, mark the current block as visited
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visited.insert(block);
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// and skip already visited blocks to avoid looping forever
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IR::Block* const phi_block{inst->PhiBlock(arg)};
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if (visited.contains(phi_block)) {
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// Already visited, skip
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if (!offset.IsImmediate()) {
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// TODO: Support SSBO arrays
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return std::nullopt;
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}
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const StorageBufferAddr storage_buffer{
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.index{index.U32()},
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.offset{offset.U32()},
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};
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if (bias && !MeetsBias(storage_buffer, *bias)) {
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// We have to blacklist some addresses in case we wrongly point to them
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return std::nullopt;
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}
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return storage_buffer;
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}
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/// Tries to track the storage buffer address used by a global memory instruction
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std::optional<StorageBufferAddr> Track(const IR::Value& value, const Bias* bias) {
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if (value.IsImmediate()) {
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// Nothing to do with immediates
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return std::nullopt;
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}
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// Breadth-first search visiting the right most arguments first
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// Small vector has been determined from shaders in Super Smash Bros. Ultimate
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small_vector<const IR::Inst*, 2> visited;
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std::queue<const IR::Inst*> queue;
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queue.push(value.InstRecursive());
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while (!queue.empty()) {
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// Pop one instruction from the queue
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const IR::Inst* const inst{queue.front()};
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queue.pop();
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if (const std::optional<StorageBufferAddr> result = TryGetStorageBuffer(inst, bias)) {
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// This is the instruction we were looking for
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return result;
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}
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// Visit the right most arguments first
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for (size_t arg = inst->NumArgs(); arg--;) {
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const IR::Value arg_value{inst->Arg(arg)};
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if (arg_value.IsImmediate()) {
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continue;
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}
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inst_block = phi_block;
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}
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const std::optional storage_buffer{Track(inst_block, inst->Arg(arg), bias, visited)};
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if (storage_buffer) {
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return *storage_buffer;
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// Queue instruction if it hasn't been visited
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const IR::Inst* const arg_inst{arg_value.InstRecursive()};
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if (std::ranges::find(visited, arg_inst) == visited.end()) {
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visited.push_back(arg_inst);
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queue.push(arg_inst);
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}
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}
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}
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// SSA tree has been traversed and the origin hasn't been found
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return std::nullopt;
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}
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/// Collects the storage buffer used by a global memory instruction and the instruction itself
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void CollectStorageBuffers(IR::Block& block, IR::Inst& inst, StorageBufferSet& storage_buffer_set,
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StorageInstVector& to_replace, StorageWritesSet& writes_set) {
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void CollectStorageBuffers(IR::Block& block, IR::Inst& inst, StorageInfo& info) {
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// NVN puts storage buffers in a specific range, we have to bias towards these addresses to
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// avoid getting false positives
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static constexpr Bias nvn_bias{
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@ -284,24 +300,23 @@ void CollectStorageBuffers(IR::Block& block, IR::Inst& inst, StorageBufferSet& s
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}
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// First try to find storage buffers in the NVN address
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const IR::U32 low_addr{low_addr_info->value};
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VisitedBlocks visited_blocks;
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std::optional storage_buffer{Track(&block, low_addr, &nvn_bias, visited_blocks)};
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std::optional storage_buffer{Track(low_addr, &nvn_bias)};
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if (!storage_buffer) {
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// If it fails, track without a bias
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visited_blocks.clear();
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storage_buffer = Track(&block, low_addr, nullptr, visited_blocks);
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storage_buffer = Track(low_addr, nullptr);
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if (!storage_buffer) {
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// If that also failed, drop the global memory usage
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// LOG_ERROR
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DiscardGlobalMemory(block, inst);
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return;
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}
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}
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// Collect storage buffer and the instruction
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if (IsGlobalMemoryWrite(inst)) {
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writes_set.insert(*storage_buffer);
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info.writes.insert(*storage_buffer);
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}
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storage_buffer_set.insert(*storage_buffer);
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to_replace.push_back(StorageInst{
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info.set.insert(*storage_buffer);
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info.to_replace.push_back(StorageInst{
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.storage_buffer{*storage_buffer},
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.inst{&inst},
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.block{&block},
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@ -371,33 +386,29 @@ void Replace(IR::Block& block, IR::Inst& inst, const IR::U32& storage_index,
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} // Anonymous namespace
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void GlobalMemoryToStorageBufferPass(IR::Program& program) {
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StorageBufferSet storage_buffers;
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StorageInstVector to_replace;
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StorageWritesSet writes_set;
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StorageInfo info;
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for (IR::Block* const block : program.post_order_blocks) {
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for (IR::Inst& inst : block->Instructions()) {
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if (!IsGlobalMemory(inst)) {
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continue;
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}
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CollectStorageBuffers(*block, inst, storage_buffers, to_replace, writes_set);
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CollectStorageBuffers(*block, inst, info);
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}
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}
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Info& info{program.info};
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u32 storage_index{};
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for (const StorageBufferAddr& storage_buffer : storage_buffers) {
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info.storage_buffers_descriptors.push_back({
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for (const StorageBufferAddr& storage_buffer : info.set) {
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program.info.storage_buffers_descriptors.push_back({
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.cbuf_index{storage_buffer.index},
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.cbuf_offset{storage_buffer.offset},
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.count{1},
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.is_written{writes_set.contains(storage_buffer)},
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.is_written{info.writes.contains(storage_buffer)},
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});
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++storage_index;
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}
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for (const StorageInst& storage_inst : to_replace) {
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for (const StorageInst& storage_inst : info.to_replace) {
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const StorageBufferAddr storage_buffer{storage_inst.storage_buffer};
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const auto it{storage_buffers.find(storage_inst.storage_buffer)};
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const IR::U32 index{IR::Value{static_cast<u32>(storage_buffers.index_of(it))}};
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const auto it{info.set.find(storage_inst.storage_buffer)};
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const IR::U32 index{IR::Value{static_cast<u32>(info.set.index_of(it))}};
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IR::Block* const block{storage_inst.block};
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IR::Inst* const inst{storage_inst.inst};
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const IR::U32 offset{StorageOffset(*block, *inst, storage_buffer)};
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