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dead_code_removing #25

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Alexander_KS merged 4 commits from dead_code_removing into master 2024-02-02 17:32:49 +00:00
Conversation 1 Commits 4 Files Changed 5 +66 -59
1 changed files with 66 additions and 59 deletions
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Showing only changes of commit b4c2f50a41 - Show all commits

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sapfor/experts/Sapfor_2017/_src/CFGraph/RD_subst.cpp
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@@ -321,38 +321,6 @@ static bool getDependencies(SAPFOR::Argument* var, SAPFOR::Instruction* instr, c
return true;
}
static bool ifVariableValid(SAPFOR::Argument* var, const set<pair<SAPFOR::Instruction*, SAPFOR::BasicBlock*>>& defs,
SAPFOR::Argument* processed_var, const pair<SAPFOR::Instruction*, SAPFOR::BasicBlock*>& def_of_processed_var)
{
const auto& BB_of_def_of_processed_var = def_of_processed_var.second;
if (defs.size() == 1)
{
const auto& def = *defs.begin();
if (def.second == BB_of_def_of_processed_var && def.first->getNumber() < def_of_processed_var.first->getNumber())
return true;
}
const auto& RD_In_BB_of_def_of_processed_var = BB_of_def_of_processed_var->getRD_In();
auto RD_of_var_from_BB_with_processed_var = RD_In_BB_of_def_of_processed_var.find(var);
if (RD_of_var_from_BB_with_processed_var != RD_In_BB_of_def_of_processed_var.end()
&& RD_of_var_from_BB_with_processed_var->second.size() == defs.size())
{
for (const auto& def : defs)
{
int number_of_istruction_with_decl = def.first ? def.first->getNumber() : CFG_VAL::UNINIT;
if (RD_of_var_from_BB_with_processed_var->second.count(number_of_istruction_with_decl) == 0)
return false;
}
return true;
}
return false;
}
static const set<SAPFOR::Argument*>& func_affects(const FuncInfo* func, const vector<SAPFOR::BasicBlock*>& blocks)
{
static map<const FuncInfo*, set<SAPFOR::Argument*>> affects;
@@ -1150,7 +1118,7 @@ vector<SAPFOR::BasicBlock*> sortCfgNodes(const vector<SAPFOR::BasicBlock*>& bloc
if (!nodes_added && processing_stack.size() != 0) {
//there is some blocks in the stack but no one can be processed
//this code should be unreachable
#ifdef DEBUG_CHECKS
#if DEBUG_CHECKS
printInternalError(convertFileName(__FILE__).c_str(), __LINE__);
#endif // DEBUG_CHECKS
auto block = processing_stack.back();
@@ -1167,7 +1135,7 @@ vector<SAPFOR::BasicBlock*> sortCfgNodes(const vector<SAPFOR::BasicBlock*>& bloc
}
}
#ifdef DEBUG_CHECKS
#if DEBUG_CHECKS
set<SAPFOR::BasicBlock*> verify_unique;
verify_unique.insert(result.begin(), result.end());
@@ -1176,7 +1144,7 @@ vector<SAPFOR::BasicBlock*> sortCfgNodes(const vector<SAPFOR::BasicBlock*>& bloc
verify_unique.clear();
#endif // DEBUG_CHECKS
#ifdef DEBUG_CHECKS
#if DEBUG_CHECKS
set<SAPFOR::BasicBlock*> all_blocks, res_blocks;
all_blocks.insert(blocks.begin(), blocks.end());
@@ -1267,7 +1235,7 @@ bool isArgReaches(int decl_instr, SAPFOR::BasicBlock* decl_bb,
if (RDs_for_arg.size() == 1)
{
const int rd = *RDs_for_arg.begin();
if (rd >= decl_bb->getInstructions().front()->getNumber() && rd <= decl_instr)
if (rd >= decl_bb->getInstructions().front()->getNumber() && rd < decl_instr)
return true;
}
@@ -1275,7 +1243,67 @@ bool isArgReaches(int decl_instr, SAPFOR::BasicBlock* decl_bb,
if (arg_in_from_decl_it == decl_bb->getRD_In().end())
return false;
return arg_in_from_decl_it->second == RDs_for_arg;
if(arg_in_from_decl_it->second != RDs_for_arg)
return false;
set<SAPFOR::BasicBlock*> reachable = { decl_bb };
set<int> banned_instructions;
for (int instr_def : arg_in_from_decl_it->second)
if (instr_def >= decl_instr || instr_def < decl_bb->getInstructions().front()->getNumber())
//try to find way [decl_bb] -> [dest_bb] with redefining of var (that means that var value from decl_bb could be overwrited)
banned_instructions.insert(instr_def);
set<SAPFOR::BasicBlock*> worklist = reachable, banned_blocks;
bool way_found = false;
while (worklist.size() != 0 && banned_instructions.size() != 0)
{
for (SAPFOR::BasicBlock* wl : worklist)
{
int start = wl->getInstructions().front()->getNumber(), end = wl->getInstructions().back()->getNumber();
for (auto banned_it = banned_instructions.begin(); banned_it != banned_instructions.end();)
{
if(start <= *banned_it && *banned_it <= end)
{
banned_it = banned_instructions.erase(banned_it);
banned_blocks.insert(wl);
}
else
{
banned_it++;
}
}
}
set<SAPFOR::BasicBlock*> to_insert;
for (auto b : worklist)
for (auto next : b->getNext())
if (reachable.insert(next).second)
to_insert.insert(next);
worklist = to_insert;
}
reachable = banned_blocks;
worklist = reachable;
while (worklist.size() != 0 || banned_instructions.size() == 0)
{
if(worklist.find(dest_bb) != worklist.end())
return false;
set<SAPFOR::BasicBlock*> to_insert;
for (auto b : worklist)
for (auto next : b->getNext())
if(next != decl_bb)
if (reachable.insert(next).second)
to_insert.insert(next);
worklist = to_insert;
}
return true;
}
// return arg's definition if it really reaches dest_bb
@@ -1597,28 +1625,7 @@ void buildSubstitutions(const map<FuncInfo*, vector<SAPFOR::BasicBlock*>>& CFGra
for (SAPFOR::Argument* dep : dependencies_of_var->second)
{
if (dep->getType() != CFG_ARG_TYPE::VAR)
{
can_use = false;
break;
}
const auto& RD_In_of_curr_BB = cur_BB->getRD_In();
auto dep_from_curr_RD_In = RD_In_of_curr_BB.find(dep);
if (dep_from_curr_RD_In == RD_In_of_curr_BB.end())
{
can_use = false;
break;
}
const auto& RDs_for_dep = dep_from_curr_RD_In->second;
set<pair<SAPFOR::Instruction*, SAPFOR::BasicBlock*>> defs_of_dep;
for (int def_instruction_num : RDs_for_dep)
defs_of_dep.insert(getInstructionAndBlockByNumber(CFGraph_for_project, def_instruction_num));
if (!ifVariableValid(dep, defs_of_dep, in_val.first, instr_and_bb))
if (!isArgReaches(instr_num, instr_and_bb.second, dep, cur_BB))
{
can_use = false;
break;