File: bitwise-copyable-derived-loadRaw.swift

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (42 lines) | stat: -rw-r--r-- 1,213 bytes parent folder | download
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
// RUN: %target-run-simple-swift(-Xfrontend -sil-verify-all -enable-experimental-feature BuiltinModule) | %FileCheck %s

// REQUIRES: executable_test

// Execute an unaligned load of SIMD16<UInt8> which conforms to a protocol derived from BitwiseCopyable.

public protocol MyBitwiseCopyable : BitwiseCopyable {}

extension SIMD16 : MyBitwiseCopyable where Scalar.SIMD16Storage : MyBitwiseCopyable {}
extension UInt8.SIMD16Storage : MyBitwiseCopyable {}

func doit() {
  let bytes: [UInt8] = Array(repeating: 0, count: 64)
  bytes.withUnsafeBufferPointer { bytes in
      let rawBytes = UnsafeRawPointer(bytes.baseAddress!) + 1
      let vector = rawBytes.myLoadUnaligned(as: SIMD16<UInt8>.self)
      //CHECK: SIMD16<UInt8>(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
      blackhole(vector)
  }
}

import Builtin

extension UnsafeRawPointer {
  @inlinable
  @_alwaysEmitIntoClient
  public func myLoadUnaligned<T : MyBitwiseCopyable>(
    fromByteOffset offset: Int = 0,
    as type: T.Type
  ) -> T {
    return Builtin.loadRaw((self + offset)._rawValue)
  }
}

doit()

@_silgen_name("blackhole")
@inline(never)
@_semantics("optimize.sil.specialize.generic.never")
func blackhole<T>(_ t: T) {
  print(t) 
}