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//===- InlinerExtension.cpp - Func Inliner Extension ----------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/Func/Extensions/InlinerExtension.h"
#include "mlir/Dialect/ControlFlow/IR/ControlFlowOps.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/IR/DialectInterface.h"
#include "mlir/Transforms/InliningUtils.h"
using namespace mlir;
using namespace mlir::func;
//===----------------------------------------------------------------------===//
// FuncDialect Interfaces
//===----------------------------------------------------------------------===//
namespace {
/// This class defines the interface for handling inlining with func operations.
struct FuncInlinerInterface : public DialectInlinerInterface {
using DialectInlinerInterface::DialectInlinerInterface;
//===--------------------------------------------------------------------===//
// Analysis Hooks
//===--------------------------------------------------------------------===//
/// Call operations can be inlined unless specified otherwise by attributes
/// on either the call or the callbale.
bool isLegalToInline(Operation *call, Operation *callable,
bool wouldBeCloned) const final {
auto callOp = dyn_cast<func::CallOp>(call);
auto funcOp = dyn_cast<func::FuncOp>(callable);
return !(callOp && callOp.getNoInline()) &&
!(funcOp && funcOp.getNoInline());
}
/// All operations can be inlined.
bool isLegalToInline(Operation *, Region *, bool, IRMapping &) const final {
return true;
}
/// All function bodies can be inlined.
bool isLegalToInline(Region *, Region *, bool, IRMapping &) const final {
return true;
}
//===--------------------------------------------------------------------===//
// Transformation Hooks
//===--------------------------------------------------------------------===//
/// Handle the given inlined terminator by replacing it with a new operation
/// as necessary.
void handleTerminator(Operation *op, Block *newDest) const final {
// Only return needs to be handled here.
auto returnOp = dyn_cast<ReturnOp>(op);
if (!returnOp)
return;
// Replace the return with a branch to the dest.
OpBuilder builder(op);
cf::BranchOp::create(builder, op->getLoc(), newDest,
returnOp.getOperands());
op->erase();
}
/// Handle the given inlined terminator by replacing it with a new operation
/// as necessary.
void handleTerminator(Operation *op, ValueRange valuesToRepl) const final {
// Only return needs to be handled here.
auto returnOp = cast<ReturnOp>(op);
// Replace the values directly with the return operands.
assert(returnOp.getNumOperands() == valuesToRepl.size());
for (const auto &it : llvm::enumerate(returnOp.getOperands()))
valuesToRepl[it.index()].replaceAllUsesWith(it.value());
}
};
} // namespace
//===----------------------------------------------------------------------===//
// Registration
//===----------------------------------------------------------------------===//
void mlir::func::registerInlinerExtension(DialectRegistry ®istry) {
registry.addExtension(+[](MLIRContext *ctx, func::FuncDialect *dialect) {
dialect->addInterfaces<FuncInlinerInterface>();
// The inliner extension relies on the ControlFlow dialect.
ctx->getOrLoadDialect<cf::ControlFlowDialect>();
});
}
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