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shader_ir: Implement a new shader scanner

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This commit is contained in:
Fernando Sahmkow
2019-06-24 19:46:49 -04:00
committed by FernandoS27
parent 618d8446ab
commit 8af6e6a052
6 changed files with 476 additions and 15 deletions
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37
src/video_core/shader/decode.cpp
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@ -11,6 +11,7 @@
#include "common/common_types.h"
#include "video_core/engines/shader_bytecode.h"
#include "video_core/engines/shader_header.h"
#include "video_core/shader/control_flow.h"
#include "video_core/shader/node_helper.h"
#include "video_core/shader/shader_ir.h"
@ -51,25 +52,31 @@ constexpr bool IsSchedInstruction(u32 offset, u32 main_offset) {
void ShaderIR::Decode() {
std::memcpy(&header, program_code.data(), sizeof(Tegra::Shader::Header));
std::set<u32> labels;
const ExitMethod exit_method = Scan(main_offset, MAX_PROGRAM_LENGTH, labels);
if (exit_method != ExitMethod::AlwaysEnd) {
UNREACHABLE_MSG("Program does not always end");
}
if (labels.empty()) {
basic_blocks.insert({main_offset, DecodeRange(main_offset, MAX_PROGRAM_LENGTH)});
ShaderCharacteristics shader_info{};
bool can_proceed = ScanFlow(program_code, MAX_PROGRAM_LENGTH, main_offset, shader_info);
if (can_proceed) {
coverage_begin = shader_info.start;
coverage_end = shader_info.end;
if (shader_info.decompilable) {
return;
}
// we can't decompile it, fallback to standard method
for (const auto& block : shader_info.blocks) {
basic_blocks.insert({block.start, DecodeRange(block.start, block.end + 1)});
}
return;
}
LOG_CRITICAL(HW_GPU, "Flow Analysis failed, falling back to brute force compiling");
labels.insert(main_offset);
for (const u32 label : labels) {
const auto next_it = labels.lower_bound(label + 1);
const u32 next_label = next_it == labels.end() ? MAX_PROGRAM_LENGTH : *next_it;
basic_blocks.insert({label, DecodeRange(label, next_label)});
// Now we need to deal with an undecompilable shader. We need to brute force
// a shader that captures every position.
coverage_begin = shader_info.start;
const u32 shader_end = static_cast<u32>(MAX_PROGRAM_LENGTH);
coverage_end = shader_end;
for (u32 label = main_offset; label < shader_end; label++) {
basic_blocks.insert({label, DecodeRange(label, label + 1)});
}
return;
}
ExitMethod ShaderIR::Scan(u32 begin, u32 end, std::set<u32>& labels) {