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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements MemorySlot-related interfaces for CIR dialect
// operations.
//
//===----------------------------------------------------------------------===//
#include "clang/CIR/Dialect/IR/CIRDialect.h"
using namespace mlir;
/// Conditions the deletion of the operation to the removal of all its uses.
static bool forwardToUsers(Operation *op,
SmallVectorImpl<OpOperand *> &newBlockingUses) {
for (Value result : op->getResults())
for (OpOperand &use : result.getUses())
newBlockingUses.push_back(&use);
return true;
}
//===----------------------------------------------------------------------===//
// Interfaces for AllocaOp
//===----------------------------------------------------------------------===//
llvm::SmallVector<MemorySlot> cir::AllocaOp::getPromotableSlots() {
return {MemorySlot{getResult(), getAllocaType()}};
}
Value cir::AllocaOp::getDefaultValue(const MemorySlot &slot,
OpBuilder &builder) {
return builder.create<cir::ConstantOp>(getLoc(),
cir::UndefAttr::get(slot.elemType));
}
void cir::AllocaOp::handleBlockArgument(const MemorySlot &slot,
BlockArgument argument,
OpBuilder &builder) {}
std::optional<PromotableAllocationOpInterface>
cir::AllocaOp::handlePromotionComplete(const MemorySlot &slot,
Value defaultValue, OpBuilder &builder) {
if (defaultValue && defaultValue.use_empty())
defaultValue.getDefiningOp()->erase();
this->erase();
return std::nullopt;
}
//===----------------------------------------------------------------------===//
// Interfaces for LoadOp
//===----------------------------------------------------------------------===//
bool cir::LoadOp::loadsFrom(const MemorySlot &slot) {
return getAddr() == slot.ptr;
}
bool cir::LoadOp::storesTo(const MemorySlot &slot) { return false; }
Value cir::LoadOp::getStored(const MemorySlot &slot, OpBuilder &builder,
Value reachingDef, const DataLayout &dataLayout) {
llvm_unreachable("getStored should not be called on LoadOp");
}
bool cir::LoadOp::canUsesBeRemoved(
const MemorySlot &slot, const SmallPtrSetImpl<OpOperand *> &blockingUses,
SmallVectorImpl<OpOperand *> &newBlockingUses,
const DataLayout &dataLayout) {
if (blockingUses.size() != 1)
return false;
Value blockingUse = (*blockingUses.begin())->get();
return blockingUse == slot.ptr && getAddr() == slot.ptr &&
getType() == slot.elemType;
}
DeletionKind cir::LoadOp::removeBlockingUses(
const MemorySlot &slot, const SmallPtrSetImpl<OpOperand *> &blockingUses,
OpBuilder &builder, Value reachingDefinition,
const DataLayout &dataLayout) {
getResult().replaceAllUsesWith(reachingDefinition);
return DeletionKind::Delete;
}
//===----------------------------------------------------------------------===//
// Interfaces for StoreOp
//===----------------------------------------------------------------------===//
bool cir::StoreOp::loadsFrom(const MemorySlot &slot) { return false; }
bool cir::StoreOp::storesTo(const MemorySlot &slot) {
return getAddr() == slot.ptr;
}
Value cir::StoreOp::getStored(const MemorySlot &slot, OpBuilder &builder,
Value reachingDef, const DataLayout &dataLayout) {
return getValue();
}
bool cir::StoreOp::canUsesBeRemoved(
const MemorySlot &slot, const SmallPtrSetImpl<OpOperand *> &blockingUses,
SmallVectorImpl<OpOperand *> &newBlockingUses,
const DataLayout &dataLayout) {
if (blockingUses.size() != 1)
return false;
Value blockingUse = (*blockingUses.begin())->get();
return blockingUse == slot.ptr && getAddr() == slot.ptr &&
getValue() != slot.ptr && slot.elemType == getValue().getType();
}
DeletionKind cir::StoreOp::removeBlockingUses(
const MemorySlot &slot, const SmallPtrSetImpl<OpOperand *> &blockingUses,
OpBuilder &builder, Value reachingDefinition,
const DataLayout &dataLayout) {
return DeletionKind::Delete;
}
//===----------------------------------------------------------------------===//
// Interfaces for CopyOp
//===----------------------------------------------------------------------===//
bool cir::CopyOp::loadsFrom(const MemorySlot &slot) {
return getSrc() == slot.ptr;
}
bool cir::CopyOp::storesTo(const MemorySlot &slot) {
return getDst() == slot.ptr;
}
Value cir::CopyOp::getStored(const MemorySlot &slot, OpBuilder &builder,
Value reachingDef, const DataLayout &dataLayout) {
return cir::LoadOp::create(builder, getLoc(), slot.elemType, getSrc());
}
DeletionKind cir::CopyOp::removeBlockingUses(
const MemorySlot &slot, const SmallPtrSetImpl<OpOperand *> &blockingUses,
OpBuilder &builder, mlir::Value reachingDefinition,
const DataLayout &dataLayout) {
if (loadsFrom(slot))
cir::StoreOp::create(builder, getLoc(), reachingDefinition, getDst(),
/*isVolatile=*/false,
/*alignment=*/mlir::IntegerAttr{},
/*mem-order=*/cir::MemOrderAttr());
return DeletionKind::Delete;
}
bool cir::CopyOp::canUsesBeRemoved(
const MemorySlot &slot, const SmallPtrSetImpl<OpOperand *> &blockingUses,
SmallVectorImpl<OpOperand *> &newBlockingUses,
const DataLayout &dataLayout) {
if (getDst() == getSrc())
return false;
return getLength(dataLayout) == dataLayout.getTypeSize(slot.elemType);
}
//===----------------------------------------------------------------------===//
// Interfaces for CastOp
//===----------------------------------------------------------------------===//
bool cir::CastOp::canUsesBeRemoved(
const SmallPtrSetImpl<OpOperand *> &blockingUses,
SmallVectorImpl<OpOperand *> &newBlockingUses,
const DataLayout &dataLayout) {
if (getKind() == cir::CastKind::bitcast)
return forwardToUsers(*this, newBlockingUses);
return false;
}
DeletionKind cir::CastOp::removeBlockingUses(
const SmallPtrSetImpl<OpOperand *> &blockingUses, OpBuilder &builder) {
return DeletionKind::Delete;
}
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