This means that we'll end up going int32 -> int64 -> float/double sometiems, but LLVM knows how to optimize away the intermediate conversion so we end up with just a normal 32b->float conversion as desired, and we get much, much better performance on oddball platforms like arm64_32.
The `_diagnoseUnavailableCodeReached()` function was introduced in the Swift
5.9 standard library and employs `@backDeployed` to support compilation of
binaries that target OS releases aligned with earlier Swift releases.
Unfortunately, though, this backdeployment strategy doesn't work well for some
unusual build environments. Specifically, in some configurations code may be
built with a compiler from a recent Swift toolchain and then linked against the
dylibs in an older toolchain. When linking against the older dylibs, the
`_diagnoseUnavailableCodeReached()` function does not exist but the
`@backDeployed` thunks emitted into the binary reference that function and
therefore linking fails.
The idea of building with one toolchain and then linking to the dylibs in a
different, older toolchain is extremely dubious. However, it exists and for now
we need to support it. This PR introduces an alternative
`_diagnoseUnavailableCodeReached()` function that is annotated with
`@_alwaysEmitIntoClient`. Calls to the AEIC variant are now emitted by the
compiler when the deployment target is before Swift 5.9.
Once these unusual build environments upgrade and start linking against a Swift
5.9 toolchain or later we can revert all of this.
Resolves rdar://119046537
The SIL printer is printing opaque parameters as <anonymous>, which
breaks the SIL parser. Stop using opaque parameters in the standard
library for the moment to unbreak SIL parsing of the standard library.
NFC.
We know maxLength must be positive and non-zero, and therefore, i += 1 will be the next index until we reach maxLength, in which case the result is 0. Rather than perform a modulo, which requires division, every time, we can just reset i when it reaches the end of the buffer.
Static read-only arrays didn't work when passed to ObjectiveC as NSArray.
The storage class of static read-only arrays doesn't carry information about the Element type.
The new `__SwiftDeferredStaticNSArray` is generic over the element type and doesn't have to rely on the element type information of the array storage.
rdar://94185998
So far the semantic annotation was just added to the internal `_getCount` function.
But for FixedArray it is also required to add the `@_semantics("array.get_count")` to the public API.
Implementation of the DebugDescription macro pitched on the forums:
https://forums.swift.org/t/pitch-debug-description-macro/67711. In this initial commit,
the macro is named `_DebugDescription` to indicate it's internal use at this time,
pending Swift Evolution.
rdar://115180949
* Add concrete overload for on all stdlib integer types.
* Add very basic tests for type inference of comparands.
* Add a comment explaining why these overloads are present.
