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