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用的是创龙的OMAP-L138的板子和XDS100v3仿真器,用的方法是TSCL = 0;( A" e* l+ L/ Q4 y' i2 d
TSCH = 0;
7 L! N+ m4 |3 {2 p unsigned long long start,stop,overhead;$ z6 l! x$ J; [4 T; M& v# c7 R
start = _itoll(TSCH,TSCL);8 J9 m8 A2 I$ O j% L. _
stop = _itoll(TSCH,TSCL);
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& ]) Z; h5 k6 h2 E4 y+ S( B9 noverhead = stop - start; I9 ^! c4 O& K( r" k
printf("overhead run-time is %d\n",overhead);1 ]+ u+ G; Q; o: ]4 V& x/ T
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start = _itoll(TSCH,TSCL);
7 i5 a. d% d5 F6 o3 C; O//here is function
5 Y7 G Q( ~4 I! o9 f: i$ {function();+ X$ q- h( g4 j% S7 P
stop = _itoll(TSCH,TSCL);+ @: N8 [9 L% _
printf("The function run-time time is %lu\n",(stop - start - overhead));
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3 a3 r0 \! `' E" P3 n, s为什么每次测量出来的时间都不一致?测量出来的不是一个固定的值。& k5 L/ g* u& t9 x$ h* Y) I5 D
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