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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;3 c& ^' B6 x$ N" }, ?* X- R" S
TSCH = 0;; T }# u9 ]8 ~- X* s
unsigned long long start,stop,overhead;- c( s4 }* D3 t
start = _itoll(TSCH,TSCL);
- y: i" u0 `- r1 d( X0 ^8 m4 t0 h stop = _itoll(TSCH,TSCL); ; ~- B0 A5 E0 S$ U6 q
# D8 n+ ?& W; |) K9 ^) |0 R( @" `overhead = stop - start;1 _. u# z) b6 o+ ?- C; L8 S
printf("overhead run-time is %d\n",overhead);
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8 A$ n" p) z6 L1 t! w# W; L, q4 y& Sstart = _itoll(TSCH,TSCL);# n9 V3 s& }7 D- d6 ^6 y
//here is function
% ^& Y& v5 m4 o5 E `0 Hfunction();
( {9 M l7 f- Wstop = _itoll(TSCH,TSCL);
" o' t* q' G6 r0 ?printf("The function run-time time is %lu\n",(stop - start - overhead));: t# N: S3 y0 D6 c& R7 O
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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。
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