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shader_ir: Remove the old scanner.

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This commit is contained in:
Fernando Sahmkow 2019-06-24 21:01:49 -04:00 committed by FernandoS27
parent 8af6e6a052
commit c218ae4b02
2 changed files with 0 additions and 77 deletions
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66
src/video_core/shader/decode.cpp
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@ -22,20 +22,6 @@ using Tegra::Shader::OpCode;
namespace {
/// Merges exit method of two parallel branches.
constexpr ExitMethod ParallelExit(ExitMethod a, ExitMethod b) {
if (a == ExitMethod::Undetermined) {
return b;
}
if (b == ExitMethod::Undetermined) {
return a;
}
if (a == b) {
return a;
}
return ExitMethod::Conditional;
}
/**
* Returns whether the instruction at the specified offset is a 'sched' instruction.
* Sched instructions always appear before a sequence of 3 instructions.
@ -79,58 +65,6 @@ void ShaderIR::Decode() {
return;
}
ExitMethod ShaderIR::Scan(u32 begin, u32 end, std::set<u32>& labels) {
const auto [iter, inserted] =
exit_method_map.emplace(std::make_pair(begin, end), ExitMethod::Undetermined);
ExitMethod& exit_method = iter->second;
if (!inserted)
return exit_method;
for (u32 offset = begin; offset != end && offset != MAX_PROGRAM_LENGTH; ++offset) {
coverage_begin = std::min(coverage_begin, offset);
coverage_end = std::max(coverage_end, offset + 1);
const Instruction instr = {program_code[offset]};
const auto opcode = OpCode::Decode(instr);
if (!opcode)
continue;
switch (opcode->get().GetId()) {
case OpCode::Id::EXIT: {
// The EXIT instruction can be predicated, which means that the shader can conditionally
// end on this instruction. We have to consider the case where the condition is not met
// and check the exit method of that other basic block.
using Tegra::Shader::Pred;
if (instr.pred.pred_index == static_cast<u64>(Pred::UnusedIndex)) {
return exit_method = ExitMethod::AlwaysEnd;
} else {
const ExitMethod not_met = Scan(offset + 1, end, labels);
return exit_method = ParallelExit(ExitMethod::AlwaysEnd, not_met);
}
}
case OpCode::Id::BRA: {
const u32 target = offset + instr.bra.GetBranchTarget();
labels.insert(target);
const ExitMethod no_jmp = Scan(offset + 1, end, labels);
const ExitMethod jmp = Scan(target, end, labels);
return exit_method = ParallelExit(no_jmp, jmp);
}
case OpCode::Id::SSY:
case OpCode::Id::PBK: {
// The SSY and PBK use a similar encoding as the BRA instruction.
UNIMPLEMENTED_IF_MSG(instr.bra.constant_buffer != 0,
"Constant buffer branching is not supported");
const u32 target = offset + instr.bra.GetBranchTarget();
labels.insert(target);
// Continue scanning for an exit method.
break;
}
default:
break;
}
}
return exit_method = ExitMethod::AlwaysReturn;
}
NodeBlock ShaderIR::DecodeRange(u32 begin, u32 end) {
NodeBlock basic_block;
for (u32 pc = begin; pc < (begin > end ? MAX_PROGRAM_LENGTH : end);) {

11
src/video_core/shader/shader_ir.h
View file

@ -26,14 +26,6 @@ using ProgramCode = std::vector<u64>;
constexpr u32 MAX_PROGRAM_LENGTH = 0x1000;
/// Describes the behaviour of code path of a given entry point and a return point.
enum class ExitMethod {
Undetermined, ///< Internal value. Only occur when analyzing JMP loop.
AlwaysReturn, ///< All code paths reach the return point.
Conditional, ///< Code path reaches the return point or an END instruction conditionally.
AlwaysEnd, ///< All code paths reach a END instruction.
};
class ConstBuffer {
public:
explicit ConstBuffer(u32 max_offset, bool is_indirect)
@ -132,8 +124,6 @@ public:
private:
void Decode();
ExitMethod Scan(u32 begin, u32 end, std::set<u32>& labels);
NodeBlock DecodeRange(u32 begin, u32 end);
/**
@ -329,7 +319,6 @@ private:
u32 coverage_begin{};
u32 coverage_end{};
std::map<std::pair<u32, u32>, ExitMethod> exit_method_map;
std::map<u32, NodeBlock> basic_blocks;
NodeBlock global_code;