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39 lines
1.3 KiB
Swift
39 lines
1.3 KiB
Swift
//===--- SimplifyValueToBridgeObject.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 ValueToBridgeObjectInst : OnoneSimplifiable {
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func simplify(_ context: SimplifyContext) {
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// Optimize the sequence
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// ```
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// %1 = value_to_bridge_object %0
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// %2 = struct $SomeInt (%1)
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// %3 = unchecked_trivial_bit_cast %2
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// %4 = struct_extract %3, #valueFieldInInt
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// %5 = value_to_bridge_object %4
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// ```
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// to
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// ```
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// %5 = value_to_bridge_object %0
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// ```
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// This sequence comes up in the code for constructing an empty string literal.
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//
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if let se = self.value as? StructExtractInst,
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let utbc = se.struct as? UncheckedTrivialBitCastInst,
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let vtbo = utbc.fromValue as? ValueToBridgeObjectInst {
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self.operand.set(to: vtbo.value, context)
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}
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}
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}
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