aeec94500a
Current inliner disables inlining when the caller is in a region with single block trait, while the callee function contains multiple blocks. the SingleBlock trait is used in operations such as do/while loop, for example fir.do_loop, fir.iterate_while and fir.if. Typically, calls within loops are good candidates for inlining. However, functions with multiple blocks are also common. for example, any function with "if () then return" will result in multiple blocks in MLIR. This change gives the flexibility of a customized inliner to handle such cases. doClone: clones instructions and other information from the callee function into the caller function. . canHandleMultipleBlocks: checks if functions with multiple blocks can be inlined into a region with the SingleBlock trait. The default behavior of the inliner remains unchanged. --------- Co-authored-by: jeanPerier <jean.perier.polytechnique@gmail.com> Co-authored-by: Mehdi Amini <joker.eph@gmail.com>
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
//===- TestInlining.cpp - Pass to inline calls in the test dialect --------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// TODO: This pass is only necessary because the main inlining pass
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// has not abstracted away the call+callee relationship. When the inlining
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// interface has this support, this pass should be removed.
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//
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//===----------------------------------------------------------------------===//
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#include "TestDialect.h"
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#include "TestOps.h"
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#include "mlir/Dialect/Func/IR/FuncOps.h"
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#include "mlir/IR/BuiltinOps.h"
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#include "mlir/IR/IRMapping.h"
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#include "mlir/Pass/Pass.h"
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#include "mlir/Transforms/Inliner.h"
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#include "mlir/Transforms/InliningUtils.h"
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#include "llvm/ADT/StringSet.h"
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using namespace mlir;
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using namespace test;
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namespace {
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struct InlinerTest
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: public PassWrapper<InlinerTest, OperationPass<func::FuncOp>> {
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MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(InlinerTest)
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StringRef getArgument() const final { return "test-inline"; }
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StringRef getDescription() const final {
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return "Test inlining region calls";
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}
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void runOnOperation() override {
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InlinerConfig config;
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auto function = getOperation();
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// Collect each of the direct function calls within the module.
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SmallVector<func::CallIndirectOp, 16> callers;
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function.walk(
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[&](func::CallIndirectOp caller) { callers.push_back(caller); });
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// Build the inliner interface.
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InlinerInterface interface(&getContext());
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// Try to inline each of the call operations.
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for (auto caller : callers) {
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auto callee = dyn_cast_or_null<FunctionalRegionOp>(
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caller.getCallee().getDefiningOp());
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if (!callee)
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continue;
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// Inline the functional region operation, but only clone the internal
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// region if there is more than one use.
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if (failed(inlineRegion(
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interface, config.getCloneCallback(), &callee.getBody(), caller,
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caller.getArgOperands(), caller.getResults(), caller.getLoc(),
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/*shouldCloneInlinedRegion=*/!callee.getResult().hasOneUse())))
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continue;
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// If the inlining was successful then erase the call and callee if
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// possible.
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caller.erase();
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if (callee.use_empty())
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callee.erase();
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}
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}
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};
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} // namespace
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namespace mlir {
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namespace test {
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void registerInliner() { PassRegistration<InlinerTest>(); }
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} // namespace test
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} // namespace mlir
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