gistfile1.m

//
// Speciaal voor @junkiesxl

// ######## YES nil N, 10000000 iterations
// 0 0.376909: if
// 0 0.456258: if-equivalent statement
// 0 0.312767: statement
// 0 0.368508: statement-equivalent ifs
// 1 0.309485: if
// 1 0.324720: if-equivalent statement
// 1 0.306790: statement
// 1 0.337566: statement-equivalent ifs
// 2 0.310687: if
// 2 0.343567: if-equivalent statement
// 2 0.361835: statement
// 2 0.323326: statement-equivalent ifs
// total 0.332360: if
// total 0.374848: if-equivalent statement
// total 0.327131: statement
// total 0.343133: statement-equivalent ifs
//
// ######## NO nil N, 10000000 iterations
// 0 0.259425: if
// 0 0.285579: if-equivalent statement
// 0 0.390533: statement
// 0 0.330332: statement-equivalent ifs
// 1 0.278179: if
// 1 0.313811: if-equivalent statement
// 1 0.381250: statement
// 1 0.321606: statement-equivalent ifs
// 2 0.278277: if
// 2 0.298398: if-equivalent statement
// 2 0.378585: statement
// 2 0.327610: statement-equivalent ifs
// total 0.271960: if
// total 0.299263: if-equivalent statement
// total 0.383456: statement
// total 0.326516: statement-equivalent ifs
//
// ######## YES nil Bla, 10000000 iterations
// 0 2.547005: if
// 0 2.437984: if-equivalent statement
// 0 2.504259: statement
// 0 2.575665: statement-equivalent ifs
// 1 2.445735: if
// 1 2.458748: if-equivalent statement
// 1 2.388922: statement
// 1 2.458811: statement-equivalent ifs
// 2 2.472405: if
// 2 2.446070: if-equivalent statement
// 2 2.440226: statement
// 2 2.491306: statement-equivalent ifs
// total 2.488382: if
// total 2.447601: if-equivalent statement
// total 2.444469: statement
// total 2.508594: statement-equivalent ifs
//
// ######## NO nil Bla, 10000000 iterations
// 0 0.290399: if
// 0 0.291128: if-equivalent statement
// 0 2.574967: statement
// 0 2.483595: statement-equivalent ifs
// 1 0.278779: if
// 1 0.286530: if-equivalent statement
// 1 2.472457: statement
// 1 2.483466: statement-equivalent ifs
// 2 0.264189: if
// 2 0.320351: if-equivalent statement
// 2 2.466572: statement
// 2 2.495031: statement-equivalent ifs
// total 0.277789: if
// total 0.299336: if-equivalent statement
// total 2.504665: statement
// total 2.487364: statement-equivalent ifs
//
// ######## YES iets N, 10000000 iterations
// 0 0.368698: if
// 0 0.354141: if-equivalent statement
// 0 0.305537: statement
// 0 0.348360: statement-equivalent ifs
// 1 0.306307: if
// 1 0.363797: if-equivalent statement
// 1 0.334056: statement
// 1 0.327442: statement-equivalent ifs
// 2 0.331045: if
// 2 0.348089: if-equivalent statement
// 2 0.310539: statement
// 2 0.339411: statement-equivalent ifs
// total 0.335350: if
// total 0.355342: if-equivalent statement
// total 0.316711: statement
// total 0.338404: statement-equivalent ifs
//
// ######## NO iets N, 10000000 iterations
// 0 0.313580: if
// 0 0.334387: if-equivalent statement
// 0 0.351610: statement
// 0 0.345700: statement-equivalent ifs
// 1 0.382005: if
// 1 0.349941: if-equivalent statement
// 1 0.323475: statement
// 1 0.340168: statement-equivalent ifs
// 2 0.330120: if
// 2 0.323384: if-equivalent statement
// 2 0.346801: statement
// 2 0.409126: statement-equivalent ifs
// total 0.341902: if
// total 0.335904: if-equivalent statement
// total 0.340629: statement
// total 0.364998: statement-equivalent ifs
//
// ######## YES iets Bla, 10000000 iterations
// 0 2.564558: if
// 0 2.440682: if-equivalent statement
// 0 2.429113: statement
// 0 2.515968: statement-equivalent ifs
// 1 2.459344: if
// 1 2.516665: if-equivalent statement
// 1 2.460577: statement
// 1 2.471582: statement-equivalent ifs
// 2 2.446444: if
// 2 2.498884: if-equivalent statement
// 2 2.480448: statement
// 2 2.555204: statement-equivalent ifs
// total 2.490115: if
// total 2.485410: if-equivalent statement
// total 2.456713: statement
// total 2.514251: statement-equivalent ifs
//
// ######## NO iets Bla, 10000000 iterations
// 0 3.579190: if
// 0 3.388666: if-equivalent statement
// 0 2.435902: statement
// 0 3.342518: statement-equivalent ifs
// 1 3.405341: if
// 1 3.402358: if-equivalent statement
// 1 2.460596: statement
// 1 3.379473: statement-equivalent ifs
// 2 3.404787: if
// 2 3.431247: if-equivalent statement
// 2 2.438172: statement
// 2 3.380439: statement-equivalent ifs
// total 3.463106: if
// total 3.407424: if-equivalent statement
// total 2.444890: statement
// total 3.367477: statement-equivalent ifs

#import "AppDelegate.h"

static inline BOOL IsEmpty(id thing) {
    if (thing == nil) return YES;
    if ([thing isEqual:[NSNull null]]) return YES;
    if ([thing respondsToSelector:@selector(count)]) return [thing performSelector:@selector(count)] == 0;
    if ([thing respondsToSelector:@selector(length)]) return [thing performSelector:@selector(length)] == 0;
    return NO;
}

@interface Inferis : NSObject {
    
}
- (BOOL)multipleIfs:(BOOL)isTextValue values:(NSArray *)values flag:(NSString *)flag;
- (BOOL)equivalentIfs:(BOOL)isTextValue values:(NSArray *)values flag:(NSString *)flag;
- (BOOL)statement:(BOOL)isTextValue values:(NSArray *)values flag:(NSString *)flag;
- (BOOL)equivalentStatement:(BOOL)isTextValue values:(NSArray *)values flag:(NSString *)flag;
@end

@implementation Inferis : NSObject

- (BOOL)multipleIfs:(BOOL)isTextValue values:(NSArray *)values flag:(NSString *)flag {
    if (!isTextValue && IsEmpty(values)) return YES;
    if ([flag isEqualToString:@"N"]) return NO;
    return YES;
}

- (BOOL)equivalentIfs:(BOOL)isTextValue values:(NSArray *)values flag:(NSString *)flag {
    if ([flag isEqualToString:@"N"]) return NO;
    if (!isTextValue && IsEmpty(values)) return YES;
    return YES;
}


- (BOOL)statement:(BOOL)isTextValue values:(NSArray *)values flag:(NSString *)flag {
    return ![flag isEqualToString:@"N"] || (!isTextValue && IsEmpty(values));
}

- (BOOL)equivalentStatement:(BOOL)isTextValue values:(NSArray *)values flag:(NSString *)flag {
    return (!isTextValue && IsEmpty(values)) || ![flag isEqualToString:@"N"];
}
@end

@interface AppDelegate () {
    Inferis* inf;
}

@end

@implementation AppDelegate

@synthesize window = _window;

#define ITERATIONS 10000000
#define TIMES 3

static inline NSTimeInterval TOTAL(NSTimeInterval deltas[]) {
    NSTimeInterval result = 0;
    for (int t=0; t<TIMES; t++) {
        result += deltas[t];
    }
    
    return result/(NSTimeInterval)TIMES;
}

- (void)run:(NSString*)what with:(BOOL)isTextValue values:(NSArray *)values flag:(NSString *)flag {
    NSLog(@"######## %@, %d iterations", what, ITERATIONS);

    NSTimeInterval delta1[TIMES];
    NSTimeInterval delta2[TIMES];
    NSTimeInterval delta3[TIMES];
    NSTimeInterval delta4[TIMES];
    
    NSDate *startingDate;
    for (int t=0; t<TIMES; t++) {
        startingDate = [NSDate date];
        for (int i = 0; i < ITERATIONS; i++) {
            [inf multipleIfs:isTextValue values:values flag:flag];
        }
        delta1[t] = [[NSDate date] timeIntervalSinceDate:startingDate];
        NSLog(@"%d %f: if", t, delta1[t]);

        startingDate = [NSDate date];
        for (int i = 0; i < ITERATIONS; i++) {
            [inf equivalentStatement:isTextValue values:values flag:flag];
        }
        delta3[t] = [[NSDate date] timeIntervalSinceDate:startingDate];
        NSLog(@"%d %f: if-equivalent statement", t, delta3[t]);
        
        startingDate = [NSDate date];
        for (int i = 0; i < ITERATIONS; i++) {
            [inf statement:isTextValue values:values flag:flag];
        }
        delta2[t] = [[NSDate date] timeIntervalSinceDate:startingDate];
        NSLog(@"%d %f: statement", t, delta2[t]);
        
        startingDate = [NSDate date];
        for (int i = 0; i < ITERATIONS; i++) {
            [inf equivalentIfs:isTextValue values:values flag:flag];
        }
        delta4[t] = [[NSDate date] timeIntervalSinceDate:startingDate];
        NSLog(@"%d %f: statement-equivalent ifs", t, delta4[t]);
    }

    NSLog(@"total %f: if", TOTAL(delta1));
    NSLog(@"total %f: if-equivalent statement", TOTAL(delta3));
    NSLog(@"total %f: statement", TOTAL(delta2));
    NSLog(@"total %f: statement-equivalent ifs", TOTAL(delta4));
}

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    inf = [[Inferis alloc] init];
    NSArray *iets = [NSArray arrayWithObject:@"iets"];

    [self run:@"YES nil N" with:YES values:nil flag:@"N"]; 
    [self run:@"NO nil N" with:NO values:nil flag:@"N"]; 
    [self run:@"YES nil Bla" with:YES values:nil flag:@"Bla"]; 
    [self run:@"NO nil Bla" with:NO values:nil flag:@"Bla"]; 
    [self run:@"YES iets N" with:YES values:iets flag:@"N"]; 
    [self run:@"NO iets N" with:YES values:iets flag:@"N"]; 
    [self run:@"YES iets Bla" with:YES values:iets flag:@"Bla"]; 
    [self run:@"NO iets Bla" with:NO values:iets flag:@"Bla"]; 
}
@end