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5c0ae940eb
This comes up in the code for constructing an empty string literal. With this optimization it's possible to statically initialize empty string global variables.
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 : OnoneSimplifyable {
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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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