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#include "slang-ir-insts.h"
namespace Slang
{
void IRDeduplicationContext::init(IRModule* module)
{
m_module = module;
m_session = module->getSession();
m_globalValueNumberingMap.clear();
m_constantMap.clear();
}
void IRDeduplicationContext::removeHoistableInstFromGlobalNumberingMap(IRInst* instToRemove)
{
InstHashSet userWorkListSet(instToRemove->getModule());
InstWorkList userWorkList(instToRemove->getModule());
auto addToWorkList = [&](IRInst* i)
{
if (userWorkListSet.add(i))
userWorkList.add(i);
};
addToWorkList(instToRemove);
for (Index i = 0; i < userWorkList.getCount(); i++)
{
auto inst = userWorkList[i];
if (getIROpInfo(inst->getOp()).isHoistable())
{
_removeGlobalNumberingEntry(inst);
for (auto use = inst->firstUse; use; use = use->nextUse)
{
addToWorkList(use->getUser());
}
}
}
}
void IRDeduplicationContext::tryHoistInst(IRInst* inst)
{
InstWorkList workList(inst->getModule());
InstHashSet workListSet(inst->getModule());
workList.add(inst);
workListSet.add(inst);
IRBuilder builder(inst->getModule());
for (Index i = 0; i < workList.getCount(); i++)
{
auto item = workList[i];
// Does inst no longer depend on anything defined locally?
// If so we should hoist it.
bool shouldHoist = false;
for (UInt a = 0; a < item->getOperandCount(); a++)
{
auto opParent = item->getOperand(a)->getParent();
if (opParent != item->getParent())
{
shouldHoist = true;
break;
}
}
// Hoisting this inst
if (shouldHoist)
{
item->removeFromParent();
addHoistableInst(&builder, item);
// Continue to consider all users for hoisting.
for (auto use = item->firstUse; use; use = use->nextUse)
{
if (getIROpInfo(use->getUser()->getOp()).isHoistable())
{
if (workListSet.add(use->getUser()))
workList.add(use->getUser());
}
}
}
}
}
} // namespace Slang
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