void MemoryValue::dumpMeta(CommaPrinter& comma, PrintStream& out) const
{
if (m_offset)
out.print(comma, "offset = ", m_offset);
if ((isLoad() && effects().reads != range())
|| (isStore() && effects().writes != range()))
out.print(comma, "range = ", range());
}
/* Funct m, stage 4 / Memory, assumes the em and mw Baskets */
void m(MIPS_SIM* sim, EMB* emBasket, MWB* mwBasket) /* memory write */
{
if(emBasket->aluOut != 0)
{
int opc = emBasket->ir >> 26;
printf("--- In Mem ---\n");
if(isStore(opc)) /* For Store Word Insturctions */
{
printf("in m: exe store type\n");
switch(opc)
{
case 0x28: /* store byte */
mem[emBasket->aluOut] = emBasket->bReg & 0x000000FF;
break;
case 0x29: /* store half word */
mem[emBasket->aluOut] = emBasket->bReg & 0x0000FFFF;
break;
case 0x2B: /* store word */
mem[emBasket->aluOut] = emBasket->bReg;
break;
}
printRegs(sim);
clearem(emBasket);
}
else /* For Load Word Instrustions */
{
if(mwBasket->wBusy)
return;
else
{
printf("in mem: exe load type\n");
mwBasket->wBusy = 1;
mwBasket->type = 2;
mwBasket->mdr = mem[emBasket->aluOut]; /* write to mdr */
clearem(emBasket);
}
}
}
void SimpleAliasAnalysis::analyze(ir::IRKernel& kernel)
{
// Functions can be called
_aStoreCanReachThisFunction = !kernel.function();
_kernel = &kernel;
if(_aStoreCanReachThisFunction) return;
for(auto block = kernel.cfg()->begin();
block != kernel.cfg()->end(); ++block)
{
for(auto instruction = block->instructions.begin();
instruction != block->instructions.end(); ++instruction)
{
auto ptx = static_cast<ir::PTXInstruction*>(*instruction);
if(ptx->isStore())
{
_aStoreCanReachThisFunction = true;
return;
}
}
}
}
void MemMap::optimizeMemoryAccesses(Trace* trace) {
StoreList tracking;
for (IRInstruction* inst : trace->getInstructionList()) {
// initialize each instruction as live
inst->setId(LIVE);
int offset = -1;
Opcode op = inst->getOpcode();
if (isLoad(op)) {
if (op == LdProp) {
offset = inst->getSrc(1)->getConstValAsInt();
}
optimizeLoad(inst, offset);
} else if (isStore(op)) {
if (op == StProp || op == StPropNT) {
offset = inst->getSrc(1)->getConstValAsInt();
}
// if we see a store, first check if its last available access is a store
// if it is, then the last access is a dead store
IRInstruction* access = getLastAccess(inst->getSrc(0), offset);
if (access != NULL && isStore(access->getOpcode())) {
// if a dead St* is followed by a St*NT, then the second store needs to
// now write in the type because the first store will be removed
if (access->getOpcode() == StProp && op == StPropNT) {
inst->setOpcode(StProp);
} else if (access->getOpcode() == StLoc && op == StLocNT) {
inst->setOpcode(StLoc);
} else if (access->getOpcode() == StRef && op == StRefNT) {
inst->setOpcode(StRef);
}
access->setId(DEAD);
}
// start tracking the current store
tracking.push_back(std::make_pair(inst, std::vector<IRInstruction*>()));
} else if (inst->mayRaiseError()) {
// if the function has an exit edge that we don't know anything about
// (raising an error), then all stores we're currently tracking need to
// be erased. all stores already declared dead are untouched
StoreList::iterator it, end;
for (it = tracking.begin(), end = tracking.end(); it != end; ) {
StoreList::iterator copy = it;
++it;
if (copy->first->getId() != DEAD) {
// XXX: t1779667
tracking.erase(copy);
}
}
}
// if the current instruction is guarded, make sure all of our stores that
// are not yet dead know about it
if (inst->getLabel() != NULL) {
for (auto& entry : tracking) {
if (entry.first->getId() != DEAD) {
entry.second.push_back(inst);
}
}
}
Simplifier::copyProp(inst);
processInstruction(inst);
}
sinkStores(tracking);
// kill the dead stores
removeDeadInstructions(trace);
}
void MemMap::optimizeMemoryAccesses(Trace* trace) {
if (hasInternalFlow(trace)) {
// This algorithm only works with linear traces.
// TODO t2066994: reset state after each block, at least.
return;
}
StoreList tracking;
const Func* curFunc = nullptr;
for (Block* block : trace->getBlocks()) {
for (IRInstruction& inst : *block) {
if (inst.getOpcode() == Marker) {
curFunc = inst.getExtra<Marker>()->func;
}
// initialize each instruction as live
setLive(inst, true);
int offset = -1;
Opcode op = inst.getOpcode();
if (isLoad(op)) {
if (op == LdProp) {
offset = inst.getSrc(1)->getValInt();
}
// initialize each instruction as live
setLive(inst, true);
optimizeLoad(&inst, offset);
} else if (isStore(op)) {
if (op == StProp || op == StPropNT) {
offset = inst.getSrc(1)->getValInt();
}
// if we see a store, first check if its last available access is a store
// if it is, then the last access is a dead store
auto access = inst.getOpcode() == StLoc || inst.getOpcode() == StLocNT
? lastLocalAccess(inst.getExtra<LocalId>()->locId)
: getLastAccess(inst.getSrc(0), offset);
if (access && isStore(access->getOpcode())) {
// if a dead St* is followed by a St*NT, then the second store needs to
// now write in the type because the first store will be removed
if (access->getOpcode() == StProp && op == StPropNT) {
inst.setOpcode(StProp);
} else if (access->getOpcode() == StLoc && op == StLocNT) {
inst.setOpcode(StLoc);
} else if (access->getOpcode() == StRef && op == StRefNT) {
inst.setOpcode(StRef);
}
setLive(*access, false);
}
// start tracking the current store
tracking.push_back(std::make_pair(&inst, std::vector<IRInstruction*>()));
} else if (inst.mayRaiseError()) {
// if the function has an exit edge that we don't know anything about
// (raising an error), then all stores we're currently tracking need to
// be erased. all stores already declared dead are untouched
StoreList::iterator it, end;
for (it = tracking.begin(), end = tracking.end(); it != end; ) {
StoreList::iterator copy = it;
++it;
if (isLive(copy->first)) {
// XXX: t1779667
tracking.erase(copy);
}
}
}
// if the current instruction is guarded, make sure all of our stores that
// are not yet dead know about it
if (inst.getTaken()) {
for (auto& entry : tracking) {
if (isLive(entry.first)) {
entry.second.push_back(&inst);
}
}
}
Simplifier::copyProp(&inst);
processInstruction(&inst, curFunc && curFunc->isPseudoMain());
}
}
sinkStores(tracking);
// kill the dead stores
removeDeadInstructions(trace, m_liveInsts);
}
bool Instruction::isMemop(){
return (isLoad() || isStore());
}
bool Instruction::accessesMemory() const
{
return isLoad() || isStore();
}