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flow_optimize.cpp
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flow_optimize.cpp
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#include "flow_optimize.h"
extern int optimize_flag;
extern std::string input_filename;
extern std::set<std::string> local_function_table;
///////////////////////////////////////////////////////////
IR_LiveRange_t::IR_LiveRange_t(int left, int right, std::string var_name) :
left(left), right(right),
rewritable(true), representative_var_name(var_name),
defined_position(NULL), referenced_position({}),
is_front_edge(false), is_back_edge(false),
successor_LRs({})
{
}
IR_LiveRangeSet_t::IR_LiveRangeSet_t() :
LR_Array({})
{
}
void _construct_sing_lrset(basic_block_t& blk, IR_LiveRangeSet_t& lrset)
{
std::map<std::string, IR_LiveRange_t* > current_LiveRange;
for(auto it : blk.RegliveIn)
{
IR_LiveRange_t tmplr(0, 0, it);
tmplr.is_front_edge = true;
// The variables from liveIn SHOULDN'T been renamed
current_LiveRange.insert({it, new IR_LiveRange_t(tmplr)});
// These variables' [defined_position] is NULL
}
// Forward scan this block.
for(auto p = blk.begin;
p != blk.end;
p++)
{
// Update current_LiveRange
// If this instruction referenced some vars, update their LiveRange
myAssert(typeid(*(IROper_t*)*p) == typeid(IROper_t),ASSERT_EXIT_CODE_42);
auto ref_var = Get_Referenced_Position(*(IROper_t*)*p);
for(auto it_var : ref_var.second)
{
auto var_name = it_var.first;
auto reg_position = it_var.second;
myAssert(current_LiveRange.count(var_name),ASSERT_EXIT_CODE_43);
myAssert(current_LiveRange[var_name]->representative_var_name == var_name,ASSERT_EXIT_CODE_44);
current_LiveRange[var_name]->rewritable &= ref_var.first;
current_LiveRange[var_name]->referenced_position.push_back(reg_position);
current_LiveRange[var_name]->right = ((IROper_t*)*p)->line_number;
}
// If this instruction killed some vars, eliminate their LiveRanges
auto killed_var = Get_Killed_Position(*(IROper_t*)*p);
for(auto it_var : killed_var.second)
{
auto var_name = it_var.first;
auto reg_position = it_var.second;
if(current_LiveRange.count(var_name))
{
if(current_LiveRange[var_name]->left != current_LiveRange[var_name]->right)
// Not a dead kill
{
myAssert(current_LiveRange[var_name]->representative_var_name == var_name,ASSERT_EXIT_CODE_45);
if(!lrset.LR_Array.count(var_name))
lrset.LR_Array[var_name] = {};
lrset.LR_Array[var_name].insert(current_LiveRange[var_name]);
}
else // Dead Kill should also be taken into consideration
{
myAssert(current_LiveRange[var_name]->representative_var_name == var_name,ASSERT_EXIT_CODE_46);
if(!lrset.LR_Array.count(var_name))
lrset.LR_Array[var_name] = {};
lrset.LR_Array[var_name].insert(current_LiveRange[var_name]);
}
// Refresh [var_name]'s liveRange
IR_LiveRange_t tmplr(((IROper_t*)*p)->line_number, ((IROper_t*)*p)->line_number, var_name);
tmplr.defined_position = reg_position;
tmplr.rewritable &= killed_var.first;
current_LiveRange[var_name] = new IR_LiveRange_t(tmplr);
}
else
{
// Refresh [var_name]'s liveRange
IR_LiveRange_t tmplr(((IROper_t*)*p)->line_number, ((IROper_t*)*p)->line_number, var_name);
tmplr.defined_position = reg_position;
tmplr.rewritable &= killed_var.first;
current_LiveRange[var_name] = new IR_LiveRange_t(tmplr);
}
}
}
// Finalize LR Calculation
for(auto it_var : blk.RegliveOut)
{
myAssert(current_LiveRange.count(it_var),ASSERT_EXIT_CODE_47);
myAssert(current_LiveRange[it_var]->representative_var_name == it_var,ASSERT_EXIT_CODE_48);
current_LiveRange[it_var]->right = INT32_MAX;
current_LiveRange[it_var]->is_back_edge = true;
}
for(auto it_var : current_LiveRange)
{
// if(it_var.second->left != it_var.second->right)
{
if(!lrset.LR_Array.count(it_var.first))
lrset.LR_Array.insert({it_var.first, {}});
lrset.LR_Array[it_var.first].insert(it_var.second);
if(it_var.second->is_front_edge)
{
myAssert(!lrset.Front_Edges.count(it_var.first),ASSERT_EXIT_CODE_49);
lrset.Front_Edges.insert({it_var.first, it_var.second});
}
if(it_var.second->is_back_edge)
{
myAssert(!lrset.Back_Edges.count(it_var.first),ASSERT_EXIT_CODE_50);
lrset.Back_Edges.insert({it_var.first, it_var.second});
}
}
}
std::vector<std::string> regs = {"#0","#1","#2","#3","#4","#5","#6","#7","#8","#9","#10"};
for(auto it : regs)
{
if(!lrset.LR_Array.count(it))
lrset.LR_Array.insert({it,{}});
}
for(auto it1 : lrset.LR_Array)
{
for(auto it2 : it1.second)
{
// printf("LiveRange for %s is [%d, %d]\n", it1.first.c_str(), it2->left, it2->right);
}
}
}
bool _diff_lr(basic_block_t* blk,
std::map<basic_block_t*, IR_LiveRangeSet_t*>& LRs)
{
bool changed = false;
myAssert(LRs.count(blk),ASSERT_EXIT_CODE_51);
// If an LR is back_edge, insert all succ LRs into its successor set
auto& lrset = *LRs[blk];
for(auto it : lrset.Back_Edges)
{
auto var_name = it.first;
std::set<std::pair<IR_LiveRange_t*, void*>> tmp_successor_LRs;
IR_LiveRange_t* back_lr = it.second;
for(auto it2 : blk->out_edges)
{
myAssert(LRs.count(it2),ASSERT_EXIT_CODE_52);
auto& lrset2 = *LRs[it2];
if(lrset2.Front_Edges.count(var_name))
{
tmp_successor_LRs.insert({lrset2.Front_Edges[var_name], (void*)LRs[it2]});
it.second->rewritable &= lrset2.Front_Edges[var_name]->rewritable;
}
}
if(tmp_successor_LRs != it.second->successor_LRs)
{
it.second->successor_LRs = tmp_successor_LRs;
changed = true;
}
}
return changed;
}
void _propagate_lrs(std::list<basic_block_t*>& blks,
std::map<basic_block_t*, IR_LiveRangeSet_t*>& LRs)
{
bool changed = true;
while(changed)
{
changed = false;
for(auto it : blks)
{
changed |= _diff_lr(it, LRs);
}
}
}
void Propagate_LiveRanges(std::list<basic_block_t*>& blks)
{
// 1. Construct LiveRanges for each block
std::map<basic_block_t*, IR_LiveRangeSet_t*> LRs;
for(auto it : blks)
{
IR_LiveRangeSet_t* lrs = new IR_LiveRangeSet_t;
_construct_sing_lrset(*it, *lrs);
LRs.insert({it, lrs});
}
// 2. Propagate Relations between different lrs
_propagate_lrs(blks, LRs);
}
bool IR_LiveRangeSet_t::Check_Interleave(IR_LiveRange_t *A, IR_LiveRange_t *B)
{
int& l1 = A->left;
int& r1 = A->right;
int& l2 = B->left;
int& r2 = B->right;
return (CHECK_CROSS(l1, r1, l2, r2));
}
bool IR_LiveRangeSet_t::Check_Interleave(IR_LiveRange_t *lr, std::string regname)
{
myAssert(lr != NULL,ASSERT_EXIT_CODE_53);
myAssert(lr->rewritable,ASSERT_EXIT_CODE_54);
bool interleaved = false;
for(auto range : this->LR_Array[regname])
{
if(Check_Interleave(lr, range))
{
interleaved = true;
break;
}
}
return interleaved;
}
// std::string IR_LiveRangeSet_t::Get_Non_Interleaved_Register(IROper_t &irop)
// {
// auto kill_set = Get_Killed_Position(irop);
// if(kill_set.first == false)
// return {};
// if(kill_set.second.size() != 1)
// return {};
// std::string var_name =kill_set.second.front().first;
// IR_LiveRange_t* irlr = this->get_Defined_LiveRange(irop.line_number, var_name);
// if(irlr == NULL) // Non-use interval
// return "";
// myAssert(irlr != NULL,ASSERT_EXIT_CODE_55);
// if(!irlr->rewritable)
// return "";
// std::vector<std::string> st;
// bool interleaved = false;
// for(auto it : this->LR_Array)
// {
// // 1. Check local interfere
// myAssert(it.first != "",ASSERT_EXIT_CODE_56);
// interleaved |= Check_Interleave(irlr, it.first);
// if(interleaved == true)
// continue;
// // 2. Check successor interfere
// if(irlr->is_back_edge == true)
// {
// myAssert(this->Back_Edges.count(it.first),ASSERT_EXIT_CODE_57);
// myAssert(this->Back_Edges[it.first] == irlr,ASSERT_EXIT_CODE_58);
// for(auto it2 : irlr->successor_LRs)
// {
// }
// }
// }
// if(!st.empty())
// {
// // printf("All available registers for:");
// // asmop.print(std::cerr);
// // for(auto it : st)
// // {
// // std::cerr<<it<<" ";
// // }
// // std::cerr<<std::endl;
// return st[rand() % st.size()];
// }
// return "";
// }
///////////////////////////////////////////////////////////
bool basic_block_t::Compute_AvailIn(const std::set<std::string> all_exprs)
{
if(this->in_edges.size() == 0) // Entry Node
return false;
// Do NOT change, still empty set
std::set<std::string> newAvailIn = all_exprs;
for(auto m : this->in_edges)
{
auto diff = mySetDifference(m->AvailIn, m->ExprKill);
auto to_be_intersect = mySetUnion(m->DEExpr, diff);
newAvailIn = mySetIntersect(newAvailIn, to_be_intersect);
}
if(newAvailIn == this->AvailIn)
{
return false; // Not modified
}
else
{
this->AvailIn = newAvailIn;
return true; // Modified
}
}
void basic_block_t::Finalize_AvailOut(const std::set<std::string> all_exprs)
{
this->AvailOut = mySetUnion(this->DEExpr, mySetDifference(this->AvailIn, this->ExprKill));
}
bool basic_block_t::Compute_AntOut(const std::set<std::string> all_exprs)
{
if(this->out_edges.size() == 0) // Exiting Node
return false;
// Do NOT change, still empty set
std::set<std::string> newAntOut = all_exprs;
for(auto m : this->out_edges)
{
auto diff = mySetDifference(m->AntOut, m->ExprKill);
auto to_be_intersect = mySetUnion(m->UEExpr, diff);
newAntOut = mySetIntersect(newAntOut, to_be_intersect);
}
if(newAntOut == this->AntOut)
{
return false; // Not modified
}
else
{
this->AntOut = newAntOut;
return true; // Modified
}
}
void basic_block_t::Finalize_AntIn(const std::set<std::string> all_exprs)
{
this->AntIn = mySetUnion(this->UEExpr, mySetDifference(this->AntOut, this->ExprKill));
}
void basic_block_t::Finalize_Earliest(const std::set<std::string> all_exprs)
{
for(auto j : this->out_edges)
{
myAssert(!this->Earliest.count(j),ASSERT_EXIT_CODE_59);
auto intersect1 = mySetDifference(j->AntIn, this->AvailOut);
auto intersect2 = mySetUnion(this->ExprKill, mySetDifference(all_exprs, this->AntOut));
this->Earliest[j] = mySetIntersect(intersect1, intersect2);
}
}
bool basic_block_t::Compute_LaterIn(const std::set<std::string> all_exprs)
{
if(this->in_edges.size() == 0) // Entry Node
return false;
// Do NOT change, still empty set
std::set<std::string> newLaterIn = all_exprs;
for(auto i : this->in_edges)
{
myAssert(i->Earliest.count(this),ASSERT_EXIT_CODE_60);
auto diff = mySetDifference(i->LaterIn, i->UEExpr);
auto to_be_intersect = mySetUnion(i->Earliest[this], diff);
newLaterIn = mySetIntersect(newLaterIn, to_be_intersect);
}
if(newLaterIn == this->LaterIn)
{
return false; // Not modified
}
else
{
this->LaterIn = newLaterIn;
return true; // Modified
}
}
void basic_block_t::Finalize_Later(const std::set<std::string> all_exprs)
{
// [this] is [j]
for(auto i : this->in_edges)
{
myAssert(i->Earliest.count(this),ASSERT_EXIT_CODE_61);
myAssert(!i->Later.count(this),ASSERT_EXIT_CODE_62);
auto diff = mySetDifference(i->LaterIn, i->UEExpr);
i->Later[this] = mySetUnion(i->Earliest[this],
diff);
}
}
void basic_block_t::Finalize_Insert(const std::set<std::string> all_exprs)
{
// [this] is [j]
for(auto i : this->in_edges)
{
myAssert(i->Later.count(this),ASSERT_EXIT_CODE_63);
myAssert(!i->Insert.count(this),ASSERT_EXIT_CODE_64);
auto diff = mySetDifference(i->Later[this], this->LaterIn);
i->Insert[this] = diff;
}
}
void basic_block_t::Finalize_Delete(const std::set<std::string> all_exprs)
{
if(this->in_edges.size() == 0) // Entry Node
return;
this->Delete = mySetDifference(this->UEExpr, this->LaterIn);
}
void basic_block_t::print_Insert(std::ostream &out)
{
out<<"Insert for block "<<this->id<<":"<<std::endl;
for(auto it : this->Insert)
{
out<<"Insert at edge "<<this->id<<" -> "<<it.first->id<<" : ";
for(auto it2 : it.second)
{
out<<it2<<" ";
}
out<<std::endl;
}
}
void basic_block_t::print_Delete(std::ostream &out)
{
out<<"Delete for block "<<this->id<<":"<<std::endl;
for(auto it : this->Delete)
{
out<<it<<" ";
}
out<<std::endl;
}
////////////////////////////////////////////////////////
static bool is_immediate_operand(const IROper_t* op)
// consist only
{
#define TEST_IMMEDIATE(oper) \
if(oper.type != OPERAND_IMM && \
oper.type != OPERAND_NOT_DEFINED) \
return false;
TEST_IMMEDIATE(op->ops1);
TEST_IMMEDIATE(op->ops2);
TEST_IMMEDIATE(op->ops3);
return true;
}
std::set<OPERATION_TYPE> consideration_instrs =
{
OPER_ADD,
OPER_SUB,
OPER_MUL,
OPER_DIV,
OPER_SHL,
OPER_SHR,
OPER_SAR,
};
bool check_scheduable(const IROper_t& irop)
{
bool scheduable = true;
if(!consideration_instrs.count(irop.oper))
{
scheduable = false;
}
#define TEST_LOCALITY(oper) \
{ \
if(oper.get_static_type() != STATIC_LOCAL_VAR && \
oper.get_static_type() != STATIC_IMM && \
oper.get_static_type() != STATIC_NONE) \
{ \
scheduable = false; \
} \
}
TEST_LOCALITY(irop.dest);
TEST_LOCALITY(irop.ops1);
TEST_LOCALITY(irop.ops2);
TEST_LOCALITY(irop.ops3);
#undef TEST_LOCALITY
if(is_immediate_operand(&irop))
{
scheduable = false;
}
// If a instruction is scheduable, check if it satisfy the NameSpace Rule
if(scheduable)
{
myAssert(irop.dest.get_static_type() == STATIC_LOCAL_VAR,ASSERT_EXIT_CODE_65);
bool _test_local_var = false;
#define TEST_NAMESPACE(oper) \
if(oper.get_static_type() == STATIC_LOCAL_VAR) \
{ \
_test_local_var = true; \
if(var_to_int(oper.name) >= var_to_int(irop.dest.name)) \
{ \
printf("Assertion Failed at:\n"); \
IROper_t copy = irop; \
copy.print(std::cerr, -1); \
} \
if(var_to_int(oper.name) >= var_to_int(irop.dest.name)) \
{ \
return false; \
} \
}
TEST_NAMESPACE(irop.ops1);
TEST_NAMESPACE(irop.ops2);
TEST_NAMESPACE(irop.ops3);
myAssert(_test_local_var == true,ASSERT_EXIT_CODE_67);
}
#undef TEST_NAMESPACE
return scheduable;
}
void ExpressionSet_t::InitExprSet(basic_block_t *blk, const std::map<std::string, IROper_t *> define_chain)
{
this->_expr_set.clear();
for(auto it : blk->AvailIn)
{
myAssert(define_chain.count(it),ASSERT_EXIT_CODE_68);
_rhs_t rhs = define_chain.at(it)->get_rhs();
if(this->_expr_set.count(rhs))
{
// See which variable is defined early
auto r1 = this->_expr_set.at(rhs);
if(var_to_int(r1) > var_to_int(it))
{
this->_expr_set[rhs] = it;
}
}
else
{
this->_expr_set.insert({rhs, it});
}
}
}
void ExpressionSet_t::PropagateKilled(std::string killed_var)
{
auto p = this->_expr_set.begin();
while(p != this->_expr_set.end())
{
bool need_to_kill = false;
#define TEST_KILL_NEEDED(oper) \
if(oper.get_static_type() == STATIC_LOCAL_VAR && \
oper.name == killed_var) \
{ \
need_to_kill = true; \
}
TEST_KILL_NEEDED(p->first.ops1);
TEST_KILL_NEEDED(p->first.ops2);
TEST_KILL_NEEDED(p->first.ops3);
#undef TEST_KILL_NEEDED
if(need_to_kill)
{
p = this->_expr_set.erase(p);
}
else
{
p++;
}
}
}
bool ExpressionSet_t::RewriteBlock(basic_block_t *blk, const std::map<std::string, IROper_t *> define_chain)
{
bool changed = false;
// Initialize local _expr_set
this->InitExprSet(blk, define_chain);
for(auto p = blk->begin;
p != blk->end;
++p)
{
myAssert(typeid(*(IROper_t*)*p) == typeid(IROper_t),ASSERT_EXIT_CODE_69);
IROper_t& irop = *(IROper_t*)(*p);
bool scheduable = check_scheduable(irop);
// printf("Considering: ");
// irop.print(std::cerr, -1);
// First, try to rewrite its RHS
#define TEST_REWRITE(oper) \
if(oper.get_static_type() == STATIC_LOCAL_VAR && \
this->_rewrite_rule.count(oper.name)) \
{ \
if(oper.name != this->_rewrite_rule[oper.name]) \
{ \
oper.name = this->_rewrite_rule[oper.name]; \
changed = true; \
} \
}
TEST_REWRITE(irop.ops1);
TEST_REWRITE(irop.ops2);
TEST_REWRITE(irop.ops3);
#undef TEST_REWRITE
if(!scheduable)
// If not scheduable, check its killed vars
{
if(OPERATION_REGISTERS.count(irop.oper) &&
OPERATION_REGISTERS.at(irop.oper)[0] == 1 &&
irop.dest.get_static_type() == STATIC_LOCAL_VAR)
{
this->PropagateKilled(irop.dest.name);
}
continue;
}
myAssert(scheduable,ASSERT_EXIT_CODE_70);
// Then, try to find if it can be rewrite
myAssert(OPERATION_REGISTERS.count(irop.oper) &&
OPERATION_REGISTERS.at(irop.oper)[0] == 1 &&
irop.dest.get_static_type() == STATIC_LOCAL_VAR,ASSERT_EXIT_CODE_71);
if(this->_expr_set.count(irop.get_rhs()))
{
myAssert(irop.dest.name != "" && irop.dest.name[0] == '%',ASSERT_EXIT_CODE_72);
myAssert(this->_expr_set[irop.get_rhs()] != "" && this->_expr_set[irop.get_rhs()][0] == '%',ASSERT_EXIT_CODE_73);
int date1 = std::stoi(irop.dest.name.substr(1));
int date2 = std::stoi(this->_expr_set[irop.get_rhs()].substr(1));
if(date1-date2<12)
this->_rewrite_rule[irop.dest.name] = this->_expr_set[irop.get_rhs()];
else
{
this->_expr_set.insert({irop.get_rhs(), irop.dest.name});
this->_rewrite_rule[irop.dest.name] = irop.dest.name;
}
}
else
{
this->_expr_set.insert({irop.get_rhs(), irop.dest.name});
this->_rewrite_rule[irop.dest.name] = irop.dest.name;
}
// printf("Rewrite Rule: %s -> %s\n", irop.dest.name.c_str(), _rewrite_rule[irop.dest.name].c_str());
// Finally, check its killed vars
this->PropagateKilled(irop.dest.name);
}
return changed;
}
void Reduce_Phi_Moves(std::list<basic_block_t*>& blks)
{
// Pass #1, Check each variable's reference count
std::map<std::string, int> ref_count;
for(auto it : blks)
{
for(auto p = it->begin;
p != it->end;
++p)
{
myAssert(typeid(*(*p)) == typeid(IROper_t),ASSERT_EXIT_CODE_74);
IROper_t& irop = *(IROper_t*)(*p);
myAssert(OPERATION_REGISTERS.count(irop.oper),ASSERT_EXIT_CODE_75);
#define COUNT_REFS(opern, i) \
if(OPERATION_REGISTERS.at(irop.oper)[i] == 0 \
/* Is a Reference */ \
&& opern.get_static_type() == STATIC_LOCAL_VAR) \
{ \
auto liter = opern.name; \
if(!ref_count.count(liter)) \
ref_count[liter] = 1; \
else \
ref_count[liter]++; \
}
COUNT_REFS(irop.dest, 0);
COUNT_REFS(irop.ops1, 1);
COUNT_REFS(irop.ops2, 2);
COUNT_REFS(irop.ops3, 3);
#undef COUNT_REFS
}
}
// Pass #1+, Write reference count to MUL instruction
for(auto it : blks)
{
for(auto p = it->begin;
p != it->end;
++p)
{
myAssert(typeid(*(*p)) == typeid(IROper_t),ASSERT_EXIT_CODE_76);
IROper_t& irop = *(IROper_t*)(*p);
if(irop.oper == OPER_MUL && ref_count.count(irop.dest.name))
{
// printf("Ref Count for %s is %d at:", irop.dest.name.c_str(), ref_count.at(irop.dest.name));
// irop.print(std::cerr, -1);
irop.ref_count = ref_count.at(irop.dest.name);
}
}
}
// Pass 2, Check Replace Rules
std::map<std::string, std::string> replace_rule;
std::map<std::string, int> target_position;
for(auto it : blks)
{
for(auto p = it->begin;
p != it->end;
++p)
{
myAssert(typeid(*(*p)) == typeid(IROper_t),ASSERT_EXIT_CODE_77);
IROper_t& irop = *(IROper_t*)(*p);
if(irop.oper != OPER_PHI_MOV)
continue;
myAssert(irop.oper == OPER_PHI_MOV,ASSERT_EXIT_CODE_78);
if(irop.ops1.get_static_type() != STATIC_LOCAL_VAR)
{
continue;
}
myAssert(irop.dest.get_static_type() == STATIC_LOCAL_VAR,ASSERT_EXIT_CODE_79);
if(ref_count[irop.ops1.name] == 1)
{
myAssert(!replace_rule.count(irop.ops1.name),ASSERT_EXIT_CODE_80);
replace_rule.insert({irop.ops1.name, irop.dest.name});
target_position[irop.ops1.name] = irop.line_number;
}
}
}
// Pass 3, Check if there occurrs any reference for target PHI vars
// if exists, we can't rewrite to PHI var, because the PHI var will be referenced,
// and cannot be destroyed.
// Pass 3.1, check first define position
std::map<std::string, int> define_position;
{
for(auto it : blks)
{
for(auto p = it->begin;
p != it->end;
++p)
{
myAssert(typeid(*(*p)) == typeid(IROper_t),ASSERT_EXIT_CODE_81);
IROper_t& irop = *(IROper_t*)(*p);
myAssert(OPERATION_REGISTERS.count(irop.oper),ASSERT_EXIT_CODE_82);
if(OPERATION_REGISTERS.at(irop.oper)[0] == 1 &&
irop.dest.get_static_type() == STATIC_LOCAL_VAR &&
replace_rule.count(irop.dest.name))
{
if(irop.out_current_loop)
{
replace_rule.erase(irop.dest.name);
}
else
{
myAssert(target_position.count(irop.dest.name),ASSERT_EXIT_CODE_83);
if(!define_position.count(irop.dest.name))
{
define_position[irop.dest.name] = irop.line_number;
}
else
{
define_position[irop.dest.name] = std::min(irop.line_number,
define_position[irop.dest.name]);
}
}
}
}
}
// pass 3.2, check if there are any reference for PHI vars, inside a replace variable's
// live range
std::set<std::string> un_replaceable;
for(auto it : blks)
{
for(auto p = it->begin;
p != it->end;
++p)
{
myAssert(typeid(*(*p)) == typeid(IROper_t),ASSERT_EXIT_CODE_84);
IROper_t& irop = *(IROper_t*)(*p);
myAssert(OPERATION_REGISTERS.count(irop.oper),ASSERT_EXIT_CODE_85);
for(auto replace_pair : replace_rule)
{
std::string src = replace_pair.first;
std::string tar = replace_pair.second;
if(!define_position.count(src)) // [src] is not defined, but referred
{
continue;
}
myAssert(define_position.count(src),ASSERT_EXIT_CODE_86);
myAssert(target_position.count(src),ASSERT_EXIT_CODE_87);
if(!
(define_position[src] < irop.line_number &&
irop.line_number <= target_position[src])
)
{
continue;
}
int i = 0;
auto opern = irop.dest;
#define TEST_REPLACEABLE(opern, i) \
if(OPERATION_REGISTERS.at(irop.oper)[i] == 0 \
/* Is a Reference */ \
&& opern.get_static_type() == STATIC_LOCAL_VAR) \
{ \
auto liter = opern.name; \
if(liter == tar) \
{ \
un_replaceable.insert(src); \
} \
}
TEST_REPLACEABLE(irop.dest, 0);
TEST_REPLACEABLE(irop.ops1, 1);
TEST_REPLACEABLE(irop.ops2, 2);
TEST_REPLACEABLE(irop.ops3, 3);
#undef TEST_REPLACEABLE
}
}
}
// Pass 3, Operate Replace
for(auto it : blks)
{
for(auto p = it->begin;
p != it->end;
++p)
{
myAssert(typeid(*(*p)) == typeid(IROper_t),ASSERT_EXIT_CODE_88);
IROper_t& irop = *(IROper_t*)(*p);
#define REPLACE(oper) \
if(oper.get_static_type() == STATIC_LOCAL_VAR && \
replace_rule.count(oper.name) && \
!un_replaceable.count(oper.name)) \
{ \
oper.name = replace_rule[oper.name]; \
}
REPLACE(irop.dest);
REPLACE(irop.ops1);
REPLACE(irop.ops2);
REPLACE(irop.ops3);
#undef REPLACE
}
}
}
}
void Flow_Optimize(std::list<basic_block_t*>& blks)
// [blks]'s instruction is held in the [irs] list
{
// Pass 1. Lazy Code Motion, ref: Engineering A Compiler 2nd, Section 10.3.1
// See [codegen.h] for more information
bool changed = true;
while(changed)
{
changed = false;
// Pass 1.1, Find DEExpr, UEExpr and ExprKill
for(auto it : blks)
{
it->DEExpr = {};
it->UEExpr = {};
it->ExprKill = {};
// Pass 1.1.1, DEExpr
{
std::set<std::string> DEExpr_killed_vars;
auto p = it->end;
if(p == it->begin)
continue;
p--;
while(1)
{
myAssert(typeid(*(IROper_t*)*p) == typeid(IROper_t),ASSERT_EXIT_CODE_89);
IROper_t& irop = *(IROper_t*)(*p);
// First, consider if this instruction can be added into DEExpr
bool scheduable = check_scheduable(irop);
if(!scheduable)
// Even if a instruction is not scheduable, it might killed some vars
{
// Check if it killed some vars
if(OPERATION_REGISTERS.count(irop.oper) &&
OPERATION_REGISTERS.at(irop.oper)[0] == 1 &&
irop.dest.get_static_type() == STATIC_LOCAL_VAR)
{
// myAssert(!DEExpr_killed_vars.count(irop.dest.name),ASSERT_EXIT_CODE_90);
DEExpr_killed_vars.insert(irop.dest.name);
}
if(p == it->begin)
break;
else
{
p--;
continue;
}
}
myAssert(scheduable,ASSERT_EXIT_CODE_91);
// If a instruction is scheduable, check if its Rvalue is defined
bool rval_killed = false;
#define TEST_RVAL_KILLED(oper) \
if(oper.get_static_type() == STATIC_LOCAL_VAR && \
DEExpr_killed_vars.count(oper.name)) \
{ \
rval_killed = true; \
}
TEST_RVAL_KILLED(irop.ops1);
TEST_RVAL_KILLED(irop.ops2);
TEST_RVAL_KILLED(irop.ops3);
#undef TEST_RVAL_KILLED
if(rval_killed == false)
// Fine!
{
it->DEExpr.insert(irop.dest.name);
// we can use the expression name to find its operation
}
// Check its killed variable
{
myAssert(irop.dest.get_static_type() == STATIC_LOCAL_VAR,ASSERT_EXIT_CODE_92);
myAssert(OPERATION_REGISTERS.count(irop.oper),ASSERT_EXIT_CODE_93);
myAssert(OPERATION_REGISTERS.at(irop.oper)[0] == 1,ASSERT_EXIT_CODE_94);
myAssert(!DEExpr_killed_vars.count(irop.dest.name),ASSERT_EXIT_CODE_95);
DEExpr_killed_vars.insert(irop.dest.name);
}
// End of While
if(p == it->begin)
break;
else
{
p--;
continue;
}
}
}
// Pass 1.1.2, UEExpr
{
std::set<std::string> UEExpr_killed_vars;
auto p = it->begin;
while(p != it->end)
{
myAssert(typeid(*(IROper_t*)*p) == typeid(IROper_t),ASSERT_EXIT_CODE_96);
IROper_t& irop = *(IROper_t*)(*p);
// First, consider if this instruction can be added into UEExpr
bool scheduable = check_scheduable(irop);
if(!scheduable)
// Even if a instruction is not scheduable, it might killed some vars
{
// Check if it killed some vars
if(OPERATION_REGISTERS.count(irop.oper) &&
OPERATION_REGISTERS.at(irop.oper)[0] == 1 &&
irop.dest.get_static_type() == STATIC_LOCAL_VAR)
{
// myAssert(!UEExpr_killed_vars.count(irop.dest.name),ASSERT_EXIT_CODE_97);
UEExpr_killed_vars.insert(irop.dest.name);
}
if(p == it->end)
{
myAssert(0,ASSERT_EXIT_CODE_98);
// Segmentation Fault may occurs, and may not execute to this point.
}
else
{
p++;
continue;
}
}
myAssert(scheduable,ASSERT_EXIT_CODE_99);
// If a instruction is scheduable, check if its Rvalue is defined
bool rval_killed = false;
#define TEST_RVAL_KILLED(oper) \
if(oper.get_static_type() == STATIC_LOCAL_VAR && \
UEExpr_killed_vars.count(oper.name)) \
{ \
rval_killed = true; \
}
TEST_RVAL_KILLED(irop.ops1);
TEST_RVAL_KILLED(irop.ops2);
TEST_RVAL_KILLED(irop.ops3);
#undef TEST_RVAL_KILLED
if(rval_killed == false)
// Fine!
{
it->UEExpr.insert(irop.dest.name);
// we can use the expression name to find its operation
}
// Check its killed variable
{
myAssert(irop.dest.get_static_type() == STATIC_LOCAL_VAR,ASSERT_EXIT_CODE_100);
myAssert(OPERATION_REGISTERS.count(irop.oper),ASSERT_EXIT_CODE_101);
myAssert(OPERATION_REGISTERS.at(irop.oper)[0] == 1,ASSERT_EXIT_CODE_102);
myAssert(!UEExpr_killed_vars.count(irop.dest.name),ASSERT_EXIT_CODE_103);
UEExpr_killed_vars.insert(irop.dest.name);
}
// End of While
if(p == it->end)
{
myAssert(0,ASSERT_EXIT_CODE_104);
}
else
{
p++;
continue;
}
}
}
// Pass 1.1.3, ExprKill