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5f561ed596
Adds to SemanticARCOpts a new step of removing move_value instructions if they are redundant. A move_value is redundant if it adds no new information or optimization opportunities. An example of adding information: a lifetime becoming lexical. The new lifetime's destroys cannot be hoisted over deinit barriers. An example of adding an optimization opportunity: the original value escapes but the value produced by the move_value does not escape. So destroys of the new value can be hoisted more aggressively.
52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
//===--- SemanticARCOpts.h ------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_SILOPTIMIZER_SEMANTICARC_SEMANTICARCOPTS_H
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#define SWIFT_SILOPTIMIZER_SEMANTICARC_SEMANTICARCOPTS_H
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#include <cstdint>
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#include <type_traits>
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namespace swift {
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namespace semanticarc {
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/// An enum used so that at the command line, we can override which transforms
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/// we perform.
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enum class ARCTransformKind : uint64_t {
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Invalid = 0,
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OwnedToGuaranteedPhi = 0x1,
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LoadCopyToLoadBorrowPeephole = 0x2,
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RedundantBorrowScopeElimPeephole = 0x4,
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// TODO: Split RedundantCopyValueElimPeephole into more granular categories
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// such as dead live range, guaranteed copy_value opt, etc.
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RedundantCopyValueElimPeephole = 0x8,
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LifetimeJoiningPeephole = 0x10,
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OwnershipConversionElimPeephole = 0x20,
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RedundantMoveValueElim = 0x40,
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AllPeepholes = LoadCopyToLoadBorrowPeephole |
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RedundantBorrowScopeElimPeephole |
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RedundantCopyValueElimPeephole | LifetimeJoiningPeephole |
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OwnershipConversionElimPeephole,
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All = AllPeepholes | OwnedToGuaranteedPhi | RedundantMoveValueElim,
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};
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inline ARCTransformKind operator&(ARCTransformKind lhs, ARCTransformKind rhs) {
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using UnderlyingTy = std::underlying_type<ARCTransformKind>::type;
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return ARCTransformKind(UnderlyingTy(lhs) & UnderlyingTy(rhs));
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}
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} // namespace semanticarc
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} // namespace swift
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#endif
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