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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;
# ~ Z- v6 E7 t TSCH = 0;+ W0 _( b( t. Z R
unsigned long long start,stop,overhead;
; Y& }, u& l" X) J) V( w- Q start = _itoll(TSCH,TSCL);" e8 ]4 G6 x Z( ^
stop = _itoll(TSCH,TSCL); ' e4 \: L( Z: o4 f, I
: ]% |3 a; n) w% A: C! Z6 I7 B7 \overhead = stop - start;4 C' g s: O. T
printf("overhead run-time is %d\n",overhead);# W c: t% ]3 V# A/ q0 G
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start = _itoll(TSCH,TSCL);9 K/ l/ w4 E7 h& x: k; y! s$ [3 Q
//here is function# S0 W% j, t8 r6 }4 k
function();
]% k$ O3 ?2 l* `, fstop = _itoll(TSCH,TSCL);' x) n% T) v" `' ]# P
printf("The function run-time time is %lu\n",(stop - start - overhead));
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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。: T8 I5 r7 |2 I7 z3 U% [' z* i7 L
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