Open Radar

 
Made a project to demonstrate the bug:

https://github.com/marcvanolmen/SwiftReleaseCompilerCrash

Summary:
The swift compiler crashes in optimize mode (release mode) on a complex formula

Steps to Reproduce:
compiling this code with -O causes a crash and app doesn't build.


import UIKit

class ViewController: UIViewController {
    var numPositions:Int = 2
    var pixelsPerDot:CGFloat = 3
    var selectedDotIndex:Int = 3

    func updatePositionWithPointX(x: CGFloat) {
        let newDotIndex = min(self.numPositions-1, max(0, Int( (x - (self.pixelsPerDot/2)) / self.pixelsPerDot)))
        if newDotIndex != self.selectedDotIndex {
            self.selectedDotIndex = newDotIndex
        }
    }

}