add swift 5.3 build to travis build matrix. (#13)

* add swift 5.3 build to travis build matrix.

* use withUnsafeMutableBufferPointer where necessary to fix Swift 5.3 issues.

See also: https://gist.github.com/dastrobu/ccef82aeb98ab289d94a2cc685ba2e45

.travis.yml

@@ -18,8 +18,11 @@ jobs:
  osx_image: xcode11.2
  env: SWIFT_VERSION=5.1
  - os: osx
- osx_image: xcode11.2
+ osx_image: xcode11.6
  env: SWIFT_VERSION=5.2
+ - os: osx
+ osx_image: xcode12
+ env: SWIFT_VERSION=5.3
 
 install:
  - eval "$(curl -sL https://swiftenv.fuller.li/install.sh)"

Sources/AccelerateArray/cblas.swift

@@ -18,7 +18,9 @@ public extension Array where Element == Float {
  "\(offset) == 0 || (\(offset) >= 0 && \(offset) < \(count))")
  assert(n >= 0 && n <= count - offset, "\(n) >= 0 && \(n) <= \(count) - \(offset)")
  assert(incX >= 1, "\(incX) >= 1")
- cblas_sscal(n, alpha, &self + offset, incX)
+ withUnsafeMutableBufferPointer {
+ cblas_sscal(n, alpha, $0.baseAddress! + offset, incX)
+ }
  }
 
  /// Modifies a vector in place, setting each element to a given value.
@@ -40,7 +42,9 @@ public extension Array where Element == Float {
  "\(offset) == 0 || (\(offset) >= 0 && \(offset) < \(count))")
  assert(n >= 0 && n / incX <= count - offset, "\(n) >= 0 && \(n) / \(incX) <= \(count) - \(offset)")
  assert(incX >= 1, "\(incX) >= 1")
- catlas_sset(n, alpha, &self + offset, incX)
+ withUnsafeMutableBufferPointer {
+ catlas_sset(n, alpha, $0.baseAddress! + offset, incX)
+ }
  }
 
  /// Computes the sum of two vectors, scaling each one separately (single-precision).
@@ -75,7 +79,11 @@ public extension Array where Element == Float {
  assert(n >= 0 && n / incY <= y.count - offsetY, "\(n) >= 0 && \(n) / \(incY) <= \(y.count) - \(offsetY)")
  assert(incX >= 1, "\(incX) >= 1")
  assert(incY >= 1, "\(incY) >= 1")
- catlas_saxpby(n, alpha, &self + offsetX, incX, beta, &y + offsetY, incY)
+ withUnsafeMutableBufferPointer { X in
+ y.withUnsafeMutableBufferPointer { Y in
+ catlas_saxpby(n, alpha, X.baseAddress! + offsetX, incX, beta, Y.baseAddress! + offsetY, incY)
+ }
+ }
  }
 
 }
@@ -98,7 +106,9 @@ public extension Array where Element == Double {
  "\(offset) == 0 || (\(offset) >= 0 && \(offset) < \(count))")
  assert(n >= 0 && n <= count - offset, "\(n) >= 0 && \(n) <= \(count) - \(offset)")
  assert(incX >= 1, "\(incX) >= 1")
- cblas_dscal(n, alpha, &self + offset, incX)
+ withUnsafeMutableBufferPointer {
+ cblas_dscal(n, alpha, $0.baseAddress! + offset, incX)
+ }
  }
 
  /// Modifies a vector in place, setting each element to a given value.
@@ -121,7 +131,9 @@ public extension Array where Element == Double {
  assert(n >= 0 && n <= count - offset,
  "\(n) >= 0 && \(n) <= \(count) - \(offset)")
  assert(incX >= 1, "\(incX) >= 1")
- catlas_dset(n, alpha, &self + offset, incX)
+ withUnsafeMutableBufferPointer {
+ catlas_dset(n, alpha, $0.baseAddress! + offset, incX)
+ }
  }
 
  /// Computes the sum of two vectors, scaling each one separately (single-precision).
@@ -156,6 +168,10 @@ public extension Array where Element == Double {
  assert(n >= 0 && n / incY <= y.count - offsetY, "\(n) >= 0 && \(n) / \(incY) <= \(y.count) - \(offsetY)")
  assert(incX >= 1, "\(incX) >= 1")
  assert(incY >= 1, "\(incY) >= 1")
- catlas_daxpby(n, alpha, &self + offsetX, incX, beta, &y + offsetY, incY)
+ withUnsafeMutableBufferPointer { X in
+ y.withUnsafeMutableBufferPointer { Y in
+ catlas_daxpby(n, alpha, X.baseAddress! + offsetX, incX, beta, Y.baseAddress! + offsetY, incY)
+ }
+ }
  }
 }