* [stdlib] Lemire’s nearly divisionless random int
Implementation of Daniel Lemire’s “Fast Random Integer Generation in Interval”
See https://arxiv.org/pdf/1805.10941.pdf
* [stdlib] Simpler, optimized expression
* [stdlib] O'Neill’s modulo optimization
See http://www.pcg-random.org/posts/bounded-rands.html#optimizing-modulo
* [stdlib] Remove modulo optimization
Swift, compared to C, seems unable to generate tightly fused instructions here for some reason (probably the division by zero check?)… removing.
* [stdlib] Keep OpenBSD debiasing method on 32-bit
systems until the https://bugs.swift.org/browse/SR-10910 is resolved.
* [stdlib] TODO FIXME SR-10912
Remove the old OpenBSD generation method, once 32-bit systems support multipliedFullWidth on UInt64.
The functions in LibcShims are used externally, some directly and some through @inlineable functions. These are changed to SWIFT_RUNTIME_STDLIB_SPI to better match their actual usage. Their names are also changed to add "_swift" to the front to match our naming conventions.
Three functions from SwiftObject.mm are changed to SPI and get a _swift prefix.
A few other support functions are also changed to SPI. They already had a prefix and look like they were meant to be SPI anyway. It was just hard to notice any mixup when they were #defined to the same thing.
rdar://problem/35863717
- Fix error in `last(where:)` example
- Improve MemoryLayout, UnsafePointer, and integer operator discussions
- Clean up ranges and random APIs
- Revisions to overflow operators and the SignedNumeric requirements
- Standardize on 'nonoptional' in remaining uses
The function's definition is "Returns a random value that is less than the given upper bound," which cannot possibly be satisfied with upperBound == 0; previously the function returned zero, which was a bug.
This includes various revisions to the APIs landing in Swift 4.2, including:
- Random and other randomness APIs
- Hashable changes
- MemoryLayout.offset(of:)
Custom FixedWidthInteger types may not support this.
Introduce a new (non-public) FixedWidthInteger requirement for generating random values; implement it using &<</+ in the generic case, and specialize it using RandomNumberGenerator._fill(bytes) for the builtin types.
* Use the `__has_include` and `GRND_RANDOM` macros
* Use `getentropy` instead of `getrandom`
* Use `std::min` from the <algorithm> header
* Move `#if` out of the `_stdlib_random` function
* Use `getrandom` with "/dev/urandom" fallback
* Use `#pragma comment` to import "Bcrypt.lib"
* <https://docs.microsoft.com/en-us/cpp/preprocessor/comment-c-cpp>
* <https://clang.llvm.org/docs/UsersManual.html#microsoft-extensions>
* Use "/dev/urandom" instead of `SecRandomCopyBytes`
* Use `swift::StaticMutex` for shared "/dev/urandom"
* Add `getrandom_available`; use `O_CLOEXEC` flag
Add platform impl docs
Update copyrights
Fix docs
Add _stdlib_random test
Update _stdlib_random test
Add missing &
Notice about _stdlib_random
Fix docs
Guard on upperBound = 0
Test full range of 8 bit integers
Remove some gyb
Clean up integerRangeTest
Remove FixedWidthInteger constraint
Use arc4random universally
Fix randomElement
Constrain shuffle to RandomAccessCollection
warning instead of error
Move Apple's implementation
Fix failing test on 32 bit systems
* [stdlib] Revise documentation for new random APIs
* [stdlib] Fix constraints on random integer generation
* [test] Isolate failing Random test
* [benchmark] Add benchmarks for new random APIs
Fix Float80 test
Value type generators
random -> randomElement
Fix some docs
One more doc fix
Doc fixes & bool fix
Use computed over explicit
* Remove refs to Countable ranges
* Add `_stdlib_random` for more platforms
* Use `getrandom` (if available) for Android, Cygwin
* Reorder the `_stdlib_random` functions
* Also include <features.h> on Linux
* Add `#error TODO` in `_stdlib_random` for Windows
* Colon after Fatal Error
Performance improvement for Random
gybify ranges
Fix typo in 'basic random numbers'
Add _stdlib_random as a testable method
Switch to generic constraints
Hopefully link against bcrypt
Fix some implementation details
1. Uniform distribution is now uniform
2. Apply Jens' method for uniform floats
Fix a lineable attribute
Initial random api
Use C syscall for I/O
1. Fixed an issue where integers would would result in an infinite loop if they were unsigned, or signed integers always returning negative numbers.
2. Fixed an issue with Bool initialization
Add shuffle functions
Add documentation to Random API
Fix a few typos within the documentation
Fixes more typos
Also states that the range for floating points is from 0 to 1 inclusive
Update API to reflect mailing list discussions
Remove unnecessary import
Make sure not to return upperBound on Range
Use SecRandomCopyBytes on older macOS
Update API to match mailing list discussion, add tests
Added pick(_:) to collection
Added random(in:using:) to Randomizable
Added tests
Fix typo in Randomizable documentation
Rename pick to sampling
Move sampling below random
Update docs
Use new Libc naming
Fix Random.swift with new Libc naming
Remove sampling
gybify signed integer creation
Make FloatingPoint.random exclusive
Refactor {Closed}Range.random
Fix FloatingPoint initialization
Precondition getting a random number from range
Fix some doc typos
Make .random a function
Update API to reflect discussion
Make .random a function
Remove .random() in favor of .random(in:) for all numeric types
Fix compile errors
Clean up _stdlib_random
Cleanup around API
Remove `.random()` requirement from `Collection`
Use generators
Optimize shuffle()
Thread safety for /dev/urandom
Remove {Closed}Range<BinaryFloatingPoint>.random()
Add Collection random requirement
Refactor _stdlib_random
Remove whitespace changes
Clean linux shim
Add shuffle and more tests
Provide finishing tests and suggestions
Remove refs to Countable ranges
Revert to checking if T is > UInt64
