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For a redundant pair of pointer-address conversions, e.g. %2 = address_to_pointer %1 %3 = pointer_to_address %2 [strict] replace all uses of %3 with %1.
42 lines
1.4 KiB
Swift
42 lines
1.4 KiB
Swift
//===--- SimplifyPointerToAddress.swift -----------------------------------===//
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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 - 2023 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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import SIL
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extension PointerToAddressInst : OnoneSimplifyable {
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/// For a redundant pair of pointer-address conversions, e.g.
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///
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/// %2 = address_to_pointer %1
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/// %3 = pointer_to_address %2 [strict]
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///
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/// replace all uses of %3 with %1.
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///
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func simplify(_ context: SimplifyContext) {
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if let atp = self.pointer as? AddressToPointerInst,
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atp.address.type == self.type,
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self.isStrict,
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// If the pointer is within an ownership scope, the transformation can break ownership rules, e.g.
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// %2 = begin_borrow %1
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// %3 = ref_tail_addr %2
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// %4 = address_to_pointer %3
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// end_borrow %2
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// %5 = pointer_to_address %4 <- cannot replace %5 with %3!
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//
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!atp.address.accessBase.hasLocalOwnershipLifetime
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{
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self.uses.replaceAll(with: atp.address, context)
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}
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}
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}
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