mirror of
https://github.com/apple/swift.git
synced 2025-12-21 12:14:44 +01:00
3747a2830e
Optimize the sequence ``` %1 = init_enum_data_addr %enum_addr, #someCaseWithPayload store %payload to %1 inject_enum_addr %enum_addr, #someCaseWithPayload ``` to ``` %1 = enum $E, #someCaseWithPayload, %payload store %1 to %enum_addr ``` This sequence of three instructions must appear in consecutive order. But usually this is the case, because it's generated this way by SILGen.
54 lines
2.1 KiB
Swift
54 lines
2.1 KiB
Swift
//===--- SimplifyInitEnumDataAddr.swift -----------------------------------===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See https://swift.org/LICENSE.txt for license information
|
|
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
import SIL
|
|
|
|
extension InitEnumDataAddrInst : OnoneSimplifyable {
|
|
func simplify(_ context: SimplifyContext) {
|
|
|
|
// Optimize the sequence
|
|
// ```
|
|
// %1 = init_enum_data_addr %enum_addr, #someCaseWithPayload
|
|
// store %payload to %1
|
|
// inject_enum_addr %enum_addr, #someCaseWithPayload
|
|
// ```
|
|
// to
|
|
// ```
|
|
// %1 = enum $E, #someCaseWithPayload, %payload
|
|
// store %1 to %enum_addr
|
|
// ```
|
|
// This sequence of three instructions must appear in consecutive order.
|
|
// But usually this is the case, because it's generated this way by SILGen.
|
|
//
|
|
if let nextInst = self.next,
|
|
let store = nextInst as? StoreInst,
|
|
store.destination == self,
|
|
let singleUse = self.uses.singleUse,
|
|
singleUse.instruction == store,
|
|
let nextAfterStore = store.next,
|
|
let inject = nextAfterStore as? InjectEnumAddrInst,
|
|
inject.enum == self.enum,
|
|
inject.enum.type.isLoadable(in: parentFunction) {
|
|
|
|
assert(self.caseIndex == inject.caseIndex, "mismatching case indices when creating an enum")
|
|
|
|
let builder = Builder(before: store, context)
|
|
let enumInst = builder.createEnum(caseIndex: self.caseIndex, payload: store.source, enumType: self.enum.type.objectType)
|
|
let storeOwnership = StoreInst.Ownership(for: self.enum.type, in: parentFunction, initialize: true)
|
|
builder.createStore(source: enumInst, destination: self.enum, ownership: storeOwnership)
|
|
context.erase(instruction: store)
|
|
context.erase(instruction: inject)
|
|
context.erase(instruction: self)
|
|
}
|
|
}
|
|
}
|