How did you come to that conclusion? In Swift 2.1 (I'm late to update), with
optimizations on, this function:
> func test() -> Double {
> return Double(arc4random())
> }
compiles to:
> define hidden double @_TF4test4testFT_Sd() #0 {
> entry:
> %0 = tail call i32 @arc4random()
> %1 = uitofp i32 %0 to double
> ret double %1
> }
which has no allocation at all.
Félix
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