[SILGen] Emit block after unreachable when emitting if/switch expressions #66551
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…ions When emitting the underlying `switch` statement for a `switch` expression, we emit an `unreachable` if the subject is uninhabited. Statement emission code can handle this, but expression emission expects an RValue to handed back. To remedy this, emit an unreachable block that we can emit the rest of the expression emission code into. The SILOptimizer will then drop this unreachable block.
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@swift-ci please test |
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@swift-ci please test Windows |
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When emitting the underlying
switchstatement for aswitchexpression, we emit anunreachableif the subject is uninhabited. Statement emission code can handle this, but expression emission expects an RValue to handed back. To remedy this, emit an unreachable block that we can emit the rest of the expression emission code into. The SILOptimizer will then drop this unreachable block.Resolves #66490
rdar://110636210