See http://en.wikipedia.org/wiki/Loop_unwinding
On Tuesday, June 19, 2012 9:21:06 PM UTC-7, Victor Surfer wrote:
>
> Hello,
> I found memcmp.c in bionic is like this:
>
> 30 int memcmp(const void *s1, const void *s2, size_t n)
> 31 {
> 32 const unsigned char* p1 = s1;
> 33 const unsigned char* end1 = p1 + n;
> 34 const unsigned char* p2 = s2;
> 35 int d = 0;
> 36
> 37 for (;;) {
> 38 if (d || p1 >= end1) break;
> 39 d = (int)*p1++ - (int)*p2++;
> 40
> 41 if (d || p1 >= end1) break;
> 42 d = (int)*p1++ - (int)*p2++;
> 43
> 44 if (d || p1 >= end1) break;
> 45 d = (int)*p1++ - (int)*p2++;
> 46
> 47 if (d || p1 >= end1) break;
> 48 d = (int)*p1++ - (int)*p2++;
> 49 }
> 50 return d;
> 51 }
>
>
> In the for loop, the same logic repeats 4 times, why? Can it no repeat?
>
> Thx,
> Victor
>
>
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