Performance test of the function hypot

main.m

//
//  main.m
//  HypotTest
//
//  Created by Stephan Michels on 08.01.12.
//  Copyright (c) 2012 Stephan Michels Softwareentwicklung und Beratung. All rights reserved.
//

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{

    @autoreleasepool {
        
        NSUInteger numberOfPoints = 1000;
        NSPoint points[numberOfPoints];
        for (NSUInteger pointIndex = 0; pointIndex < numberOfPoints; pointIndex++) {
            points[pointIndex].x = cosf((float)pointIndex / numberOfPoints * M_PI);
            points[pointIndex].y = sinf((float)pointIndex / numberOfPoints * M_PI);
//            NSLog(@"%lu.Point = %@", pointIndex + 1, NSStringFromPoint(points[pointIndex]));
        }
        
        NSUInteger numberOfLoops = 1000000;
        
        CGFloat length = 0;
        NSTimeInterval time = [NSDate timeIntervalSinceReferenceDate];
        for (NSUInteger loopIndex = 0; loopIndex < numberOfLoops; loopIndex++) {
            for (NSUInteger pointIndex = 1; pointIndex < numberOfPoints; pointIndex++) {
                CGFloat dx = points[pointIndex].x - points[pointIndex - 1].y;
                CGFloat dy = points[pointIndex].x - points[pointIndex - 1].y;
                length += sqrtf(dx * dx + dy * dy);
            }
        }
        time = [NSDate timeIntervalSinceReferenceDate] - time;
        NSLog(@"Result %f in %f seconds (Sqrt)", length, time);
        
        length = 0;
        time = [NSDate timeIntervalSinceReferenceDate];
        for (NSUInteger loopIndex = 0; loopIndex < numberOfLoops; loopIndex++) {
            for (NSUInteger pointIndex = 1; pointIndex < numberOfPoints; pointIndex++) {
                CGFloat dx = points[pointIndex].x - points[pointIndex - 1].y;
                CGFloat dy = points[pointIndex].x - points[pointIndex - 1].y;
                length += hypotf(dx, dy);
            }
        }
        time = [NSDate timeIntervalSinceReferenceDate] - time;
        NSLog(@"Result %f in %f seconds (Hypot)", length, time);
    }
    return 0;
}