Add vDSP_vspdp

Author: ptoffy

README.md

@@ -85,4 +85,4 @@ The package is structured as follows:
         - [x] `vDSP.mean` - Mean of a vector
     - `Transforms`:
         - [x] `vDSP_vdpsp` - Convert a double vector to a single precision vector
-        - [ ] `vDSP_vspdp` - Convert a single precision vector to a double precision vector
+        - [x] `vDSP_vspdp` - Convert a single precision vector to a double precision vector

Sources/AccelerateLinux/VectorOps/VectorTransformOps.swift

@@ -22,4 +22,25 @@ public func vDSP_vdpsp(
         i += 1
     }
 }
+
+/// Converts a single-precision vector to a double-precision vector.
+/// - Parameters:
+///   - __A: The input vector.
+///   - __IA: The distance between the elements in the input vector.
+///   - __C: The output vector.
+///   - __IC: The distance between the elements in the output vector.
+///   - __N: The number of elements that the function processes.
+public func vDSP_vspdp(
+    _ __A: UnsafePointer<Float>,
+    _ __IA: vDSP_Stride,
+    _ __C: UnsafeMutablePointer<Double>,
+    _ __IC: vDSP_Stride,
+    _ __N: vDSP_Length
+) {
+    var i = 0
+    while i < __N {
+        __C[i * __IC] = Double(__A[i * __IA])
+        i += 1
+    }
+}
 #endif