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Shader_IR: Implement BRX tracking.

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Fernando Sahmkow 2019-09-23 11:15:09 -04:00 committed by FernandoS27
parent 5ee4fb6e12
commit 2ef696c85a
1 changed files with 113 additions and 0 deletions
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113
src/video_core/shader/control_flow.cpp
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@ -124,6 +124,111 @@ enum class ParseResult : u32 {
AbnormalFlow,
};
struct BranchIndirectInfo {
u32 buffer{};
u32 offset{};
u32 entries{};
s32 relative_position{};
};
std::optional<BranchIndirectInfo> TrackBranchIndirectInfo(const CFGRebuildState& state,
u32 start_address, u32 current_position) {
const u32 shader_start = state.start;
u32 pos = current_position;
BranchIndirectInfo result{};
u64 track_register = 0;
// Step 0 Get BRX Info
const Instruction instr = {state.program_code[pos]};
const auto opcode = OpCode::Decode(instr);
if (opcode->get().GetId() != OpCode::Id::BRX) {
return {};
}
if (instr.brx.constant_buffer != 0) {
return {};
}
track_register = instr.gpr8.Value();
result.relative_position = instr.brx.GetBranchExtend();
pos--;
bool found_track = false;
// Step 1 Track LDC
while (pos >= shader_start) {
if (IsSchedInstruction(pos, shader_start)) {
pos--;
continue;
}
const Instruction instr = {state.program_code[pos]};
const auto opcode = OpCode::Decode(instr);
if (opcode->get().GetId() == OpCode::Id::LD_C) {
if (instr.gpr0.Value() == track_register &&
instr.ld_c.type.Value() == Tegra::Shader::UniformType::Single) {
result.buffer = instr.cbuf36.index;
result.offset = instr.cbuf36.GetOffset();
track_register = instr.gpr8.Value();
pos--;
found_track = true;
break;
}
}
pos--;
}
if (!found_track) {
return {};
}
found_track = false;
// Step 2 Track SHL
while (pos >= shader_start) {
if (IsSchedInstruction(pos, shader_start)) {
pos--;
continue;
}
const Instruction instr = {state.program_code[pos]};
const auto opcode = OpCode::Decode(instr);
if (opcode->get().GetId() == OpCode::Id::SHL_IMM) {
if (instr.gpr0.Value() == track_register) {
track_register = instr.gpr8.Value();
pos--;
found_track = true;
break;
}
}
pos--;
}
if (!found_track) {
return {};
}
found_track = false;
// Step 3 Track IMNMX
while (pos >= shader_start) {
if (IsSchedInstruction(pos, shader_start)) {
pos--;
continue;
}
const Instruction instr = {state.program_code[pos]};
const auto opcode = OpCode::Decode(instr);
if (opcode->get().GetId() == OpCode::Id::IMNMX_IMM) {
if (instr.gpr0.Value() == track_register) {
track_register = instr.gpr8.Value();
result.entries = instr.alu.GetSignedImm20_20();
pos--;
found_track = true;
break;
}
}
pos--;
}
if (!found_track) {
return {};
}
return {result};
}
std::pair<ParseResult, ParseInfo> ParseCode(CFGRebuildState& state, u32 address) {
u32 offset = static_cast<u32>(address);
const u32 end_address = static_cast<u32>(state.program_size / sizeof(Instruction));
@ -298,6 +403,14 @@ std::pair<ParseResult, ParseInfo> ParseCode(CFGRebuildState& state, u32 address)
break;
}
case OpCode::Id::BRX: {
auto tmp = TrackBranchIndirectInfo(state, address, offset);
if (tmp) {
auto result = *tmp;
LOG_CRITICAL(HW_GPU, "Track Successful, BRX: buffer:{}, offset:{}, entries:{}",
result.buffer, result.offset, result.entries);
} else {
LOG_CRITICAL(HW_GPU, "Track Unsuccesful");
}
return {ParseResult::AbnormalFlow, parse_info};
}
default: