Messages in this thread | | | Date | 19 Apr 2003 13:45:00 +0200 | From | (Kai Henningsen) | Subject | Re: [TRIVIAL] kstrdup |
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root@chaos.analogic.com (Richard B. Johnson) wrote on 18.04.03 in <Pine.LNX.4.53.0304181512220.22901@chaos>:
> The test for every byte transferred is, quite obviously, correct. > It is also, quite obviously, non optimum.
Actually, that is very much not obvious.
Especially if you're familiar with architectures where every move has an implicit test (typically for zero and sign), and so checking for the zero byte during the move is quite obviously the only sane thing to do - the version with a count is slower, because the inner loop does more. (Those architectures typically don't have a REP-style prefix.)
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