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https://github.com/PabloMK7/citra.git
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shader_interpreter: Fix control flow edge cases and implement break/breakc (#6844)
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GPUCode
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commit
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2 changed files with 128 additions and 72 deletions
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@ -6,6 +6,7 @@
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#include <array>
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#include <cmath>
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#include <numeric>
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#include <boost/circular_buffer.hpp>
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#include <boost/container/static_vector.hpp>
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#include <nihstro/shader_bytecode.h>
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#include "common/assert.h"
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@ -26,32 +27,64 @@ using nihstro::SwizzlePattern;
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namespace Pica::Shader {
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struct IfStackElement {
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u32 else_address;
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u32 end_address;
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};
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struct CallStackElement {
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u32 final_address; // Address upon which we jump to return_address
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u32 return_address; // Where to jump when leaving scope
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u8 repeat_counter; // How often to repeat until this call stack element is removed
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u8 loop_increment; // Which value to add to the loop counter after an iteration
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// TODO: Should this be a signed value? Does it even matter?
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u32 loop_address; // The address where we'll return to after each loop iteration
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u32 end_address;
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u32 return_address;
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};
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struct LoopStackElement {
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u32 entry_address;
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u32 end_address;
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u8 loop_downcounter;
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u8 address_increment;
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u8 previous_aL;
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};
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template <bool Debug>
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static void RunInterpreter(const ShaderSetup& setup, UnitState& state, DebugData<Debug>& debug_data,
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unsigned offset) {
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// TODO: Is there a maximal size for this?
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boost::container::static_vector<CallStackElement, 16> call_stack;
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u32 program_counter = offset;
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unsigned entry_point) {
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boost::circular_buffer<IfStackElement> if_stack(8);
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boost::circular_buffer<CallStackElement> call_stack(4);
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boost::circular_buffer<LoopStackElement> loop_stack(4);
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u32 program_counter = entry_point;
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state.conditional_code[0] = false;
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state.conditional_code[1] = false;
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auto call = [&program_counter, &call_stack](u32 offset, u32 num_instructions, u32 return_offset,
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u8 repeat_count, u8 loop_increment) {
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// -1 to make sure when incrementing the PC we end up at the correct offset
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program_counter = offset - 1;
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ASSERT(call_stack.size() < call_stack.capacity());
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call_stack.push_back(
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{offset + num_instructions, return_offset, repeat_count, loop_increment, offset});
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const auto do_if = [&](Instruction instr, bool condition) {
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if (condition) {
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if_stack.push_back({
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.else_address = instr.flow_control.dest_offset,
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.end_address = instr.flow_control.dest_offset + instr.flow_control.num_instructions,
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});
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} else {
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program_counter = instr.flow_control.dest_offset - 1;
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}
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};
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const auto do_call = [&](Instruction instr) {
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call_stack.push_back({
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.end_address = instr.flow_control.dest_offset + instr.flow_control.num_instructions,
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.return_address = program_counter + 1,
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});
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program_counter = instr.flow_control.dest_offset - 1;
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};
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const auto do_loop = [&](Instruction instr, const Common::Vec4<u8>& loop_param) {
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const u8 previous_aL = static_cast<u8>(state.address_registers[2]);
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loop_stack.push_back({
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.entry_address = program_counter + 1,
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.end_address = instr.flow_control.dest_offset + 1,
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.loop_downcounter = loop_param.x,
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.address_increment = loop_param.z,
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.previous_aL = previous_aL,
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});
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state.address_registers[2] = loop_param.y;
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};
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auto evaluate_condition = [&state](Instruction::FlowControlType flow_control) {
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@ -82,25 +115,11 @@ static void RunInterpreter(const ShaderSetup& setup, UnitState& state, DebugData
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// Placeholder for invalid inputs
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static f24 dummy_vec4_float24[4];
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unsigned iteration = 0;
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bool exit_loop = false;
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while (!exit_loop) {
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if (!call_stack.empty()) {
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auto& top = call_stack.back();
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if (program_counter == top.final_address) {
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state.address_registers[2] += top.loop_increment;
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if (top.repeat_counter-- == 0) {
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program_counter = top.return_address;
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call_stack.pop_back();
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} else {
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program_counter = top.loop_address;
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}
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// TODO: Is "trying again" accurate to hardware?
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continue;
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}
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}
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u32 iteration = 0;
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bool should_stop = false;
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while (!should_stop) {
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bool is_break = false;
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const u32 old_program_counter = program_counter;
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const Instruction instr = {program_code[program_counter]};
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const SwizzlePattern swizzle = {swizzle_data[instr.common.operand_desc_id]};
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@ -538,7 +557,7 @@ static void RunInterpreter(const ShaderSetup& setup, UnitState& state, DebugData
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// Handle each instruction on its own
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switch (instr.opcode.Value()) {
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case OpCode::Id::END:
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exit_loop = true;
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should_stop = true;
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break;
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case OpCode::Id::JMPC:
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@ -559,72 +578,68 @@ static void RunInterpreter(const ShaderSetup& setup, UnitState& state, DebugData
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break;
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case OpCode::Id::CALL:
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call(instr.flow_control.dest_offset, instr.flow_control.num_instructions,
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program_counter + 1, 0, 0);
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do_call(instr);
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break;
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case OpCode::Id::CALLU:
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Record<DebugDataRecord::COND_BOOL_IN>(
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debug_data, iteration, uniforms.b[instr.flow_control.bool_uniform_id]);
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if (uniforms.b[instr.flow_control.bool_uniform_id]) {
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call(instr.flow_control.dest_offset, instr.flow_control.num_instructions,
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program_counter + 1, 0, 0);
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do_call(instr);
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}
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break;
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case OpCode::Id::CALLC:
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Record<DebugDataRecord::COND_CMP_IN>(debug_data, iteration, state.conditional_code);
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if (evaluate_condition(instr.flow_control)) {
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call(instr.flow_control.dest_offset, instr.flow_control.num_instructions,
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program_counter + 1, 0, 0);
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do_call(instr);
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}
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break;
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case OpCode::Id::NOP:
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break;
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case OpCode::Id::IFU:
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case OpCode::Id::IFU: {
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Record<DebugDataRecord::COND_BOOL_IN>(
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debug_data, iteration, uniforms.b[instr.flow_control.bool_uniform_id]);
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if (uniforms.b[instr.flow_control.bool_uniform_id]) {
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call(program_counter + 1, instr.flow_control.dest_offset - program_counter - 1,
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instr.flow_control.dest_offset + instr.flow_control.num_instructions, 0,
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0);
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} else {
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call(instr.flow_control.dest_offset, instr.flow_control.num_instructions,
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instr.flow_control.dest_offset + instr.flow_control.num_instructions, 0,
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0);
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}
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const bool cond = uniforms.b[instr.flow_control.bool_uniform_id];
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do_if(instr, cond);
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break;
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}
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case OpCode::Id::IFC: {
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// TODO: Do we need to consider swizzlers here?
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Record<DebugDataRecord::COND_CMP_IN>(debug_data, iteration, state.conditional_code);
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if (evaluate_condition(instr.flow_control)) {
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call(program_counter + 1, instr.flow_control.dest_offset - program_counter - 1,
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instr.flow_control.dest_offset + instr.flow_control.num_instructions, 0,
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0);
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} else {
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call(instr.flow_control.dest_offset, instr.flow_control.num_instructions,
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instr.flow_control.dest_offset + instr.flow_control.num_instructions, 0,
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0);
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}
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const bool cond = evaluate_condition(instr.flow_control);
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do_if(instr, cond);
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break;
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}
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case OpCode::Id::LOOP: {
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Common::Vec4<u8> loop_param(uniforms.i[instr.flow_control.int_uniform_id].x,
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uniforms.i[instr.flow_control.int_uniform_id].y,
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uniforms.i[instr.flow_control.int_uniform_id].z,
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uniforms.i[instr.flow_control.int_uniform_id].w);
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const Common::Vec4<u8>& loop_param = uniforms.i[instr.flow_control.int_uniform_id];
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state.address_registers[2] = loop_param.y;
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Record<DebugDataRecord::LOOP_INT_IN>(debug_data, iteration, loop_param);
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call(program_counter + 1, instr.flow_control.dest_offset - program_counter,
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instr.flow_control.dest_offset + 1, loop_param.x, loop_param.z);
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do_loop(instr, loop_param);
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Record<DebugDataRecord::ADDR_REG_OUT>(debug_data, iteration,
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state.address_registers);
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break;
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}
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case OpCode::Id::BREAK: {
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is_break = true;
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Record<DebugDataRecord::ADDR_REG_OUT>(debug_data, iteration,
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state.address_registers);
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break;
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}
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case OpCode::Id::BREAKC: {
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Record<DebugDataRecord::COND_CMP_IN>(debug_data, iteration, state.conditional_code);
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if (evaluate_condition(instr.flow_control)) {
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is_break = true;
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}
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Record<DebugDataRecord::ADDR_REG_OUT>(debug_data, iteration,
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state.address_registers);
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break;
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}
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@ -657,6 +672,47 @@ static void RunInterpreter(const ShaderSetup& setup, UnitState& state, DebugData
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++program_counter;
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++iteration;
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// Stacks are checked in the order CALL -> IF -> LOOP. The CALL stack
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// can be popped multiple times per instruction. A JMP at the end of a
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// scope is never taken, this is why we compare against
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// old_program_counter + 1 here.
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u32 next_program_counter = old_program_counter + 1;
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for (u32 i = 0; i < 4; i++) {
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if (call_stack.empty() || call_stack.back().end_address != next_program_counter)
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break;
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// Hardware bug: when popping four CALL scopes at once, the last
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// one doesn't update the program counter
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if (i < 3) {
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program_counter = call_stack.back().return_address;
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next_program_counter = program_counter;
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}
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call_stack.pop_back();
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}
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// The other two stacks can only pop one entry per instruction. They
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// are checked against the original program counter before any CALL
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// scopes were closed and they overwrite any previous program counter
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// updates.
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if (!if_stack.empty() && if_stack.back().else_address == old_program_counter + 1) {
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program_counter = if_stack.back().end_address;
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if_stack.pop_back();
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}
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if (!loop_stack.empty() &&
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(loop_stack.back().end_address == old_program_counter + 1 || is_break)) {
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auto& loop = loop_stack.back();
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state.address_registers[2] += loop.address_increment;
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if (!is_break && loop.loop_downcounter--) {
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program_counter = loop.entry_address;
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} else {
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program_counter = loop.end_address;
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// Only restore previous value if there is a surrounding LOOP scope.
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if (loop_stack.size() > 1)
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state.address_registers[2] = loop.previous_aL;
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loop_stack.pop_back();
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}
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}
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}
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}
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