gistfile1.m

// test2 = 0.365886 // (float)M_PI
// test1 = 0.603662 // M_PI

#import "PiTestAppDelegate.h"

#define COUNT (1000000)

@implementation PiTestAppDelegate

@synthesize window;

void test1(float* array1, float* array2){
	for(int i = 0; i < COUNT; i++){
		array2[i] = array1[i] / M_PI * 180.0f;
	}
}

void test2(float* array1, float* array2){
	for(int i = 0; i < COUNT; i++){
		array2[i] = array1[i] / (float)M_PI * 180.0f;
	}
}

- (void)applicationDidFinishLaunching:(UIApplication *)application {    

    // Override point for customization after application launch
    [window makeKeyAndVisible];
	
	float* arrayf1 = malloc(sizeof(float)*COUNT);
	float* arrayf2 = malloc(sizeof(float)*COUNT);
	for(int i = 0; i < COUNT; i++){
		arrayf1[i] = random();
	}

	NSDate* a_dateStart1 = [NSDate date];
	test1(arrayf1, arrayf2);
	NSLog(@"%s test1 = %f", __func__, [[NSDate date] timeIntervalSinceDate:a_dateStart1]);

	NSDate* a_dateStart2 = [NSDate date];
	test2(arrayf1, arrayf2);
	NSLog(@"%s test2 = %f", __func__, [[NSDate date] timeIntervalSinceDate:a_dateStart2]);

	free(arrayf1);
	free(arrayf2);
}


- (void)dealloc {
    [window release];
    [super dealloc];
}


@end