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#include "slang-ir-address-analysis.h"
#include "slang-ir-insts.h"
#include "slang-ir-util.h"
namespace Slang
{
void moveInstToEarliestPoint(IRDominatorTree* domTree, IRGlobalValueWithCode* func, IRInst* inst)
{
if (!as<IRBlock>(inst->getParent()))
return;
if (domTree->isUnreachable(as<IRBlock>(inst->getParent())))
return;
InstWorkList blocks(func->getModule());
InstHashSet operandInsts(func->getModule());
for (UInt i = 0; i < inst->getOperandCount(); i++)
{
operandInsts.add(inst->getOperand(i));
auto parentBlock = as<IRBlock>(inst->getOperand(i)->getParent());
if (parentBlock)
{
if (!domTree->isUnreachable(parentBlock))
blocks.add(parentBlock);
}
}
{
operandInsts.add(inst->getFullType());
auto parentBlock = as<IRBlock>(inst->getFullType()->getParent());
if (parentBlock)
{
if (!domTree->isUnreachable(parentBlock))
blocks.add(parentBlock);
}
}
// Find earliest block that is dominated by all operand blocks.
IRBlock* earliestBlock = as<IRBlock>(inst->getParent());
for (auto block : func->getBlocks())
{
bool dominated = true;
for (auto opBlock : blocks)
{
if (!domTree->dominates(opBlock, block))
{
dominated = false;
break;
}
}
if (dominated)
{
earliestBlock = block;
break;
}
}
if (!earliestBlock)
return;
IRInst* latestOperand = nullptr;
for (auto childInst : earliestBlock->getChildren())
{
if (operandInsts.contains(childInst))
{
latestOperand = childInst;
}
}
if (!latestOperand || as<IRParam, IRDynamicCastBehavior::NoUnwrap>(latestOperand))
inst->insertBefore(earliestBlock->getFirstOrdinaryInst());
else
inst->insertAfter(latestOperand);
}
AddressAccessInfo analyzeAddressUse(IRDominatorTree* dom, IRGlobalValueWithCode* func)
{
DeduplicateContext deduplicateContext;
AddressAccessInfo info;
// Deduplicate and move known address insts.
for (auto block : func->getBlocks())
{
for (auto inst : block->getModifiableChildren())
{
switch (inst->getOp())
{
case kIROp_Var:
{
RefPtr<AddressInfo> addrInfo = new AddressInfo();
addrInfo->addrInst = inst;
addrInfo->isConstant = true;
addrInfo->parentAddress = nullptr;
info.addressInfos[inst] = addrInfo;
}
break;
case kIROp_Param:
if (as<IRPtrTypeBase>(inst->getFullType()))
{
RefPtr<AddressInfo> addrInfo = new AddressInfo();
addrInfo->addrInst = inst;
addrInfo->isConstant = (block == func->getFirstBlock() ? true : false);
addrInfo->parentAddress = nullptr;
info.addressInfos[inst] = addrInfo;
}
break;
case kIROp_GetElementPtr:
case kIROp_FieldAddress:
{
moveInstToEarliestPoint(dom, func, inst->getFullType());
moveInstToEarliestPoint(dom, func, inst);
auto deduplicated = deduplicateContext.deduplicate(
inst,
[func](IRInst* inst)
{
if (!inst->getParent())
return false;
if (inst->getParent()->getParent() != func)
return false;
switch (inst->getOp())
{
case kIROp_GetElementPtr:
case kIROp_FieldAddress:
return true;
default:
return false;
}
});
if (deduplicated != inst)
{
SLANG_RELEASE_ASSERT(dom->dominates(
as<IRBlock>(deduplicated->getParent()),
as<IRBlock>(inst->getParent())));
inst->replaceUsesWith(deduplicated);
inst->removeAndDeallocate();
}
else
{
RefPtr<AddressInfo> addrInfo = new AddressInfo();
addrInfo->addrInst = inst;
if (inst->getOp() == kIROp_FieldAddress)
{
addrInfo->isConstant = true;
}
else
{
addrInfo->isConstant =
as<IRConstant>(inst->getOperand(1)) ? true : false;
}
info.addressInfos[inst] = addrInfo;
}
}
break;
}
}
}
// Construct address info tree.
for (auto& addr : info.addressInfos)
{
RefPtr<AddressInfo> parentInfo;
if (addr.value->addrInst->getOperandCount() > 1 &&
info.addressInfos.tryGetValue(addr.value->addrInst->getOperand(0), parentInfo))
{
addr.value->parentAddress = parentInfo;
parentInfo->children.add(addr.value);
if (!parentInfo->isConstant)
addr.value->isConstant = false;
}
}
return info;
}
} // namespace Slang
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