shader_decode: Implement LDG and basic cbuf tracking

This commit is contained in:
ReinUsesLisp 2018-12-29 02:44:54 -03:00
parent ba38d91fe2
commit 3b84e04af1
7 changed files with 240 additions and 10 deletions

View file

@ -4,6 +4,7 @@
#include <algorithm>
#include <vector>
#include <fmt/format.h>
#include "common/assert.h"
#include "common/common_types.h"
@ -119,6 +120,54 @@ u32 ShaderIR::DecodeMemory(BasicBlock& bb, const BasicBlock& code, u32 pc) {
}
break;
}
case OpCode::Id::LDG: {
const u32 count = [&]() {
switch (instr.ldg.type) {
case Tegra::Shader::UniformType::Single:
return 1;
case Tegra::Shader::UniformType::Double:
return 2;
case Tegra::Shader::UniformType::Quad:
case Tegra::Shader::UniformType::UnsignedQuad:
return 4;
default:
UNIMPLEMENTED_MSG("Unimplemented LDG size!");
return 1;
}
}();
const Node addr_register = GetRegister(instr.gpr8);
const Node base_address = TrackCbuf(addr_register, code, static_cast<s64>(code.size()));
const auto cbuf = std::get_if<CbufNode>(base_address);
ASSERT(cbuf != nullptr);
const auto cbuf_offset_imm = std::get_if<ImmediateNode>(cbuf->GetOffset());
ASSERT(cbuf_offset_imm != nullptr);
const auto cbuf_offset = cbuf_offset_imm->GetValue() * 4;
bb.push_back(Comment(
fmt::format("Base address is c[0x{:x}][0x{:x}]", cbuf->GetIndex(), cbuf_offset)));
const GlobalMemoryBase descriptor{cbuf->GetIndex(), cbuf_offset};
used_global_memory_bases.insert(descriptor);
const Node immediate_offset =
Immediate(static_cast<u32>(instr.ldg.immediate_offset.Value()));
const Node base_real_address =
Operation(OperationCode::UAdd, NO_PRECISE, immediate_offset, addr_register);
for (u32 i = 0; i < count; ++i) {
const Node it_offset = Immediate(i * 4);
const Node real_address =
Operation(OperationCode::UAdd, NO_PRECISE, base_real_address, it_offset);
const Node gmem = StoreNode(GmemNode(real_address, base_address, descriptor));
SetTemporal(bb, i, gmem);
}
for (u32 i = 0; i < count; ++i) {
SetRegister(bb, instr.gpr0.Value() + i, GetTemporal(i));
}
break;
}
case OpCode::Id::ST_A: {
UNIMPLEMENTED_IF_MSG(instr.gpr8.Value() != Register::ZeroIndex,
"Indirect attribute loads are not supported");

View file

@ -257,6 +257,15 @@ private:
bool is_indirect{};
};
struct GlobalMemoryBase {
u32 cbuf_index{};
u32 cbuf_offset{};
bool operator<(const GlobalMemoryBase& rhs) const {
return std::tie(cbuf_index, cbuf_offset) < std::tie(rhs.cbuf_index, rhs.cbuf_offset);
}
};
struct MetaArithmetic {
bool precise{};
};
@ -478,14 +487,26 @@ private:
/// Global memory node
class GmemNode final {
public:
explicit constexpr GmemNode(Node address) : address{address} {}
explicit constexpr GmemNode(Node real_address, Node base_address,
const GlobalMemoryBase& descriptor)
: real_address{real_address}, base_address{base_address}, descriptor{descriptor} {}
Node GetAddress() const {
return address;
Node GetRealAddress() const {
return real_address;
}
Node GetBaseAddress() const {
return base_address;
}
const GlobalMemoryBase& GetDescriptor() const {
return descriptor;
}
private:
const Node address;
const Node real_address;
const Node base_address;
const GlobalMemoryBase descriptor;
};
/// Commentary, can be dropped
@ -543,6 +564,10 @@ public:
return used_clip_distances;
}
const std::set<GlobalMemoryBase>& GetGlobalMemoryBases() const {
return used_global_memory_bases;
}
std::size_t GetLength() const {
return static_cast<std::size_t>(coverage_end * sizeof(u64));
}
@ -734,6 +759,10 @@ private:
void WriteLop3Instruction(BasicBlock& bb, Tegra::Shader::Register dest, Node op_a, Node op_b,
Node op_c, Node imm_lut, bool sets_cc);
Node TrackCbuf(Node tracked, const BasicBlock& code, s64 cursor);
std::pair<Node, s64> TrackRegister(const GprNode* tracked, const BasicBlock& code, s64 cursor);
template <typename... T>
Node Operation(OperationCode code, const T*... operands) {
return StoreNode(OperationNode(code, operands...));
@ -786,6 +815,7 @@ private:
std::map<u32, ConstBuffer> used_cbufs;
std::set<Sampler> used_samplers;
std::array<bool, Tegra::Engines::Maxwell3D::Regs::NumClipDistances> used_clip_distances{};
std::set<GlobalMemoryBase> used_global_memory_bases;
Tegra::Shader::Header header;
};

View file

@ -0,0 +1,76 @@
// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <utility>
#include <variant>
#include "video_core/shader/shader_ir.h"
namespace VideoCommon::Shader {
namespace {
std::pair<Node, s64> FindOperation(const BasicBlock& code, s64 cursor,
OperationCode operation_code) {
for (; cursor >= 0; --cursor) {
const Node node = code[cursor];
if (const auto operation = std::get_if<OperationNode>(node)) {
if (operation->GetCode() == operation_code)
return {node, cursor};
}
}
return {};
}
} // namespace
Node ShaderIR::TrackCbuf(Node tracked, const BasicBlock& code, s64 cursor) {
if (const auto cbuf = std::get_if<CbufNode>(tracked)) {
// Cbuf found, but it has to be immediate
return std::holds_alternative<ImmediateNode>(*cbuf->GetOffset()) ? tracked : nullptr;
}
if (const auto gpr = std::get_if<GprNode>(tracked)) {
if (gpr->GetIndex() == Tegra::Shader::Register::ZeroIndex) {
return nullptr;
}
// Reduce the cursor in one to avoid infinite loops when the instruction sets the same
// register that it uses as operand
const auto [source, new_cursor] = TrackRegister(gpr, code, cursor - 1);
if (!source) {
return nullptr;
}
return TrackCbuf(source, code, new_cursor);
}
if (const auto operation = std::get_if<OperationNode>(tracked)) {
for (std::size_t i = 0; i < operation->GetOperandsCount(); ++i) {
if (const auto found = TrackCbuf((*operation)[i], code, cursor)) {
// Cbuf found in operand
return found;
}
}
return nullptr;
}
return nullptr;
}
std::pair<Node, s64> ShaderIR::TrackRegister(const GprNode* tracked, const BasicBlock& code,
s64 cursor) {
for (; cursor >= 0; --cursor) {
const auto [found_node, new_cursor] = FindOperation(code, cursor, OperationCode::Assign);
if (!found_node) {
return {};
}
const auto operation = std::get_if<OperationNode>(found_node);
ASSERT(operation);
const auto& target = (*operation)[0];
if (const auto gpr_target = std::get_if<GprNode>(target)) {
if (gpr_target->GetIndex() == tracked->GetIndex()) {
return {(*operation)[1], new_cursor};
}
}
}
return {};
}
} // namespace VideoCommon::Shader