1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
// RUN: %target-run-simple-swift
// REQUIRES: executable_test
// REQUIRES: synchronization
import Synchronization
import StdlibUnittest
let suite = TestSuite("WordPairTests")
struct UIntPair: Equatable {
var first: UInt
var second: UInt
init(_ first: UInt, _ second: UInt) {
self.first = first
self.second = second
}
}
@available(SwiftStdlib 6.0, *)
func componentsInMemoryOrder(of dword: WordPair) -> UIntPair {
let p = UnsafeMutableRawPointer.allocate(
byteCount: MemoryLayout<WordPair>.size,
alignment: MemoryLayout<WordPair>.alignment)
p.storeBytes(of: dword, as: WordPair.self)
let first = p.load(as: UInt.self)
let second = p.load(fromByteOffset: MemoryLayout<UInt>.stride, as: UInt.self)
return UIntPair(first, second)
}
if #available(SwiftStdlib 6.0, *) {
suite.test("basics") {
expectEqual(MemoryLayout<WordPair>.size, 2 * MemoryLayout<UInt>.size)
expectEqual(MemoryLayout<WordPair>.stride, MemoryLayout<WordPair>.size)
//expectEqual(MemoryLayout<WordPair>.alignment, 2 * MemoryLayout<UInt>.alignment)
let value0 = WordPair(first: 2, second: 1)
#if _endian(little)
expectEqual(componentsInMemoryOrder(of: value0), UIntPair(2, 1))
#else
expectEqual(componentsInMemoryOrder(of: value0), UIntPair(1, 2))
#endif
let value1 = WordPair(first: .max, second: 0)
expectEqual(value1.first, .max)
expectEqual(value1.second, 0)
}
} // if #available(SwiftStdlib 6.0, *)
runAllTests()
|
