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comparison Looping.M @ 0:2216535ade9c

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メンバー関数/メソッド呼び出しのベンチマーク。
author "uncorrelated zombie" <uncorrelated@yahoo.co.jp>
date Tue, 15 Feb 2011 13:47:19 +0900
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-1:000000000000 0:2216535ade9c
1 #import <stdio.h>
2 #import <objc/Object.h>
3 #import <limits.h>
4 #import <sys/time.h>
5
6 @interface Looping : Object {
7 int n0;
8 }
9 - (id)init;
10 - (int)calc:(int)n;
11 @end
12
13 @implementation Looping
14 - (id)init{
15 [super init];
16 n0 = 0;
17 return self;
18 }
19 - (int)calc:(int)n {
20 int n1 = n0 + (1 - 2*(n%2));
21 n0 = n;
22 return n1;
23 }
24 @end
25
26 double gettimeofday_sec()
27 {
28 struct timeval tv;
29 gettimeofday(&tv, NULL);
30 return tv.tv_sec + (double)tv.tv_usec*1e-6;
31 }
32
33 int main(){
34 id o = [[Looping alloc] init];
35 unsigned c;
36 int n = 1;
37 double t1, t2;
38 t1 = gettimeofday_sec();
39 for(c=0;c<INT_MAX;c++){
40 n = [o calc:n];
41 }
42 t2 = gettimeofday_sec();
43 printf("%d\nObjective-C\t%f\n", n, t2 - t1);
44 return 0;
45 }