Most of the stdlib's properties don't need @_borrowed because they're
@inlinable, but I did find one place in an overlay where it's probably
sensible to make the operation use generalized accessors even if
they're resilient.
A few internal functions were defined within the #if
INTERNAL_CHECKS_ENABLED block, which made the results different between
stdlib configurations with assertions enabled and without. Since these
fucntions are internal and are not @inlinable, it is OK to have them
unconditionally.
<rdar://problem/45880586>
This switches the standard library's sort algorithm from an in-place
introsort to use a modified timsort, a stable, adaptive sort that
merges runs using a temporary buffer. This implementation performs
straight merges instead of adopting timsort's galloping strategy.
In addition to maintaining the relative order of equal/non-comparable
elements, this algorithm outperforms the introsort on data with any
intrinsic structure, such as runs of ascending or descending elements
or a significant number of equality collisions.
Inlinable code is permitted to rely on these associated types, so we
need to make sure their declarations are printed in the parseable
interface.
Part of rdar://problem/43824052
Use relative references instead of pointers so that the pattern can be true-const. Instead of trying
to instantiate a constant key path literal in-place, point to a cache variable that we can store
a pointer to the shared instance into when instantiated. Now that the pattern format has diverged
significantly from the instance format, simplify and refactor the instantiation code using a walker
for the pattern format instead of trying to reuse the code for working with instantiated instances.
rdar://problem/42674576
Rather than rely on the UTF16View, scan between breadcrumbs by hand
for a decent 20% speedup. This code will also make it more obvious how
to slot in a vectorized solution later.
Less inlining for hashing and comparison. Saves code size on very
frequent String comparison in exchange for costing us in some of our
ridiculuous micro-benchmarks.
Also adds in more _effects for better codegen
After rebasing on master and incorporating more 32-bit support,
perform a bunch of cleanup, documentation updates, comments, move code
back to String declaration, etc.
Refactor and rename _StringGutsSlice, apply NFC-aware fast paths to a
new buffered iterator.
Also, fix bug in _typeName which used to assume ASCIIness and better
SIL optimizations on StringObject.
