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shader_ir: Decompile Flow Stack

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This commit is contained in:
Fernando Sahmkow 2019-06-25 11:10:45 -04:00 • committed by FernandoS27
parent 459fce3a8f
commit 926b80102f
4 changed files with 206 additions and 11 deletions
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46
src/video_core/shader/decode.cpp
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@ -44,6 +44,17 @@ void ShaderIR::Decode() {
coverage_begin = shader_info.start;
coverage_end = shader_info.end;
if (shader_info.decompilable) {
std::list<ShaderBlock>& blocks = shader_info.blocks;
for (auto& block : blocks) {
NodeBlock nodes;
if (!block.ignore_branch) {
nodes = DecodeRange(block.start, block.end);
InsertControlFlow(nodes, block);
} else {
nodes = DecodeRange(block.start, block.end + 1);
}
basic_blocks.insert({block.start, nodes});
}
return;
}
// we can't decompile it, fallback to standard method
@ -73,6 +84,41 @@ NodeBlock ShaderIR::DecodeRange(u32 begin, u32 end) {
return basic_block;
}
void ShaderIR::InsertControlFlow(NodeBlock& bb, const ShaderBlock& block) {
auto apply_conditions = ([&](const Condition& cond, Node n) -> Node {
Node result = n;
if (cond.cc != ConditionCode::T) {
result = Conditional(GetConditionCode(cond.cc), {result});
}
if (cond.predicate != Pred::UnusedIndex) {
u32 pred = static_cast<u32>(cond.predicate);
bool is_neg = pred > 7;
if (is_neg)
pred -= 8;
result = Conditional(GetPredicate(pred, is_neg), {result});
}
return result;
});
if (block.branch.address < 0) {
if (block.branch.kills) {
Node n = Operation(OperationCode::Discard);
n = apply_conditions(block.branch.cond, n);
bb.push_back(n);
global_code.push_back(n);
return;
}
Node n = Operation(OperationCode::Exit);
n = apply_conditions(block.branch.cond, n);
bb.push_back(n);
global_code.push_back(n);
return;
}
Node n = Operation(OperationCode::Branch, Immediate(block.branch.address));
n = apply_conditions(block.branch.cond, n);
bb.push_back(n);
global_code.push_back(n);
}
u32 ShaderIR::DecodeInstr(NodeBlock& bb, u32 pc) {
// Ignore sched instructions when generating code.
if (IsSchedInstruction(pc, main_offset)) {