> On Sep 9, 2016, at 9:27 AM, Douglas Gregor via swift-dev
> <[email protected]> wrote:
>
>
>> On Sep 8, 2016, at 1:17 PM, Rebecca Chen via swift-dev <[email protected]>
>> wrote:
>>
>> I was wondering where the SIL to IR lowering code is in the Swift source
>> code.
>
> That’s the responsibility of IRGen:
>
> https://github.com/apple/swift/tree/master/lib/IRGen
>
>> I am specifically looking for the code that lowers the function return
>> types. For example, from Int to i64.
The one place that Int is lowered to i64 is when lowering C function
signatures. This is done in IRGen/GenClangType.cpp. There’s a visitor that
walks SIL types to produce corresponding Clang types when expanding the
signature of a C function declaration or call.
Slava
>
>
> Technically, Int is a struct type defined in the standard library that looks
> like this:
>
> struct Int {
> var _value: Builtin.Int64
> }
>
> The lowering of a builtin integer type to an LLVM type is here:
>
> https://github.com/apple/swift/blob/master/lib/IRGen/GenType.cpp#L1256
>
> - Doug
>
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