Compare performance of bmx-ng's `ArrayCopy` against manual copy

array_copy_test.bmx

Framework brl.basic

Const ITERATIONS:Int = 1000000
Const ARRAY_SIZE:Int = 1000

Local startTime:Int

' ------------------------------------------------------------------------------
' -- Copying arrays of Int

' Create a source array and fill with random data.
Local sourceArray:Int[ARRAY_SIZE]
For Local i:Int = 0 To sourceArray.length - 1
	sourceArray[i] = Rand(0, ARRAY_SIZE)
Next

' Test copying using `ForEach`
startTime = MilliSecs()
For Local i:Int = 1 To ITERATIONS
	Local destArray:Int[sourceArray.Length]
	For Local t:Int = 0 To sourceArray.Length - 1
		destArray[t] = sourceArray[t]
	Next
Next
Print "Copy (foreach): " + (MilliSecs() - startTime) 

GCCollect()

' Test copying using `ArrayCopy`
startTime = MilliSecs()
For Local i:Int = 1 To ITERATIONS
	Local destArray:Int[sourceArray.length]
    ArrayCopy(sourceArray, 0, destArray, 0, sourceArray.Length)
Next
Print "ArrayCopy: " + (MilliSecs() - startTime) 


' ------------------------------------------------------------------------------
' -- Copying arrays of Object

' Create a source array and fill with random data.
Local objectArray:MyType[ARRAY_SIZE]
For Local i:Int = 0 To objectArray.length - 1
	objectArray[i] = MyType.Create(Rand(0, ARRAY_SIZE))
Next

GCCollect()

' Test copying using `ForEach`
startTime = MilliSecs()
For Local i:Int = 1 To ITERATIONS
	Local destArray:MyType[objectArray.Length]
	For Local t:Int = 0 To objectArray.Length - 1
		destArray[t] = objectArray[t]
	Next
Next
Print "Object Copy (foreach): " + (MilliSecs() - startTime) 

GCCollect()

' Test copying using `ArrayCopy`
startTime = MilliSecs()
For Local i:Int = 1 To ITERATIONS
	Local destArray:MyType[objectArray.length]
    ArrayCopy(objectArray, 0, destArray, 0, objectArray.Length)
Next
Print "Object ArrayCopy: " + (MilliSecs() - startTime) 

Type MyType
	Field value:Int

	Function Create:MyType(val:Int)
		Local this:MyType = New MyType
		this.value = val
		Return this
	End Function
End Type

Sample output:

Copy (foreach): 2249
ArrayCopy: 1127
Object Copy (foreach): 3264
Object ArrayCopy: 2152