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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;
5 o; d% A9 S' p TSCH = 0;
5 d( x/ Q9 ^) C; E unsigned long long start,stop,overhead;
8 ?" R+ p; S( f$ t. [! _; E start = _itoll(TSCH,TSCL);& m; e2 o! e6 {, l
stop = _itoll(TSCH,TSCL);
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overhead = stop - start;
9 k2 T( O/ d9 G, ^# W4 H2 F- rprintf("overhead run-time is %d\n",overhead);- |9 l0 c. R2 W2 J
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start = _itoll(TSCH,TSCL);6 p4 l$ u- |& w
//here is function
5 A4 i9 k5 B1 Mfunction();
, z* P% B( h6 g" I7 [2 a* p% z, jstop = _itoll(TSCH,TSCL);. J6 M& z! f: w# K. f! x
printf("The function run-time time is %lu\n",(stop - start - overhead));+ A; C/ l1 N9 z' d7 q. B& p
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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。2 C8 f+ @2 a4 t X$ D
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