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e317a603fc
We insert end_cow_mutation_addr for lifetime dependent values dependent on mutable addresses. end_cow_mutation_addr can be simplified to end_cow_mutation after other optimizations like inlining, specialization etc This PR adds an instruction simplification to transform end_cow_mutation_addr to end_cow_mutation. This can enable array optimizations which look for end_cow_mutation.
33 lines
1.4 KiB
Swift
33 lines
1.4 KiB
Swift
//===--- SimplifyEndCOWMutationAddr.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) 2025 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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// Simplify end_cow_mutation_addr to end_cow_mutation when it's operand is loadable
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extension EndCOWMutationAddrInst: OnoneSimplifiable, SILCombineSimplifiable {
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func simplify(_ context: SimplifyContext) {
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let address = operand.value
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if !address.type.isLoadable(in: parentFunction) {
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return
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}
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if address.type.isTrivial(in: parentFunction) {
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context.erase(instruction: self)
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return
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}
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let builder = Builder(before: self, context)
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let load = builder.createLoad(fromAddress: address, ownership: parentFunction.hasOwnership ? .take : .unqualified)
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let endCOWMutation = builder.createEndCOWMutation(instance: load, keepUnique: false)
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builder.createStore(source: endCOWMutation, destination: address, ownership: parentFunction.hasOwnership ? .initialize : .unqualified)
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context.erase(instruction: self)
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}
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}
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