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A pointer is privatizeable if it can be replaced by a new, private one. Privatizing pointer reduces the use count, interaction between unrelated code parts. This is a first step towards replacing argument promotion. While we can already handle recursion (unlike argument promotion!) we are restricted to stack allocations for now because we do not analyze the uses in the callee. Reviewed By: uenoku Differential Revision: https://reviews.llvm.org/D68852
48 lines
1.8 KiB
C++
48 lines
1.8 KiB
C++
//===- ArgumentPromotion.h - Promote by-reference arguments -----*- C++ -*-===//
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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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#ifndef LLVM_TRANSFORMS_IPO_ARGUMENTPROMOTION_H
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#define LLVM_TRANSFORMS_IPO_ARGUMENTPROMOTION_H
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#include "llvm/Analysis/CGSCCPassManager.h"
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#include "llvm/Analysis/LazyCallGraph.h"
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#include "llvm/IR/PassManager.h"
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namespace llvm {
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class TargetTransformInfo;
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/// Argument promotion pass.
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///
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/// This pass walks the functions in each SCC and for each one tries to
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/// transform it and all of its callers to replace indirect arguments with
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/// direct (by-value) arguments.
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class ArgumentPromotionPass : public PassInfoMixin<ArgumentPromotionPass> {
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unsigned MaxElements;
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public:
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ArgumentPromotionPass(unsigned MaxElements = 3u) : MaxElements(MaxElements) {}
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/// Check if callers and the callee \p F agree how promoted arguments would be
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/// passed. The ones that they do not agree on are eliminated from the sets but
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/// the return value has to be observed as well.
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static bool areFunctionArgsABICompatible(
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const Function &F, const TargetTransformInfo &TTI,
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SmallPtrSetImpl<Argument *> &ArgsToPromote,
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SmallPtrSetImpl<Argument *> &ByValArgsToTransform);
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/// Checks if a type could have padding bytes.
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static bool isDenselyPacked(Type *type, const DataLayout &DL);
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PreservedAnalyses run(LazyCallGraph::SCC &C, CGSCCAnalysisManager &AM,
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LazyCallGraph &CG, CGSCCUpdateResult &UR);
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};
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_IPO_ARGUMENTPROMOTION_H
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