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Thread: Optimisation

  1. Dec 18th, 2003, 05:45 AM #1
    wossname
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    Optimisation

    A few years ago I saw a thread somewhere explaining things like...

    Code:
    //C++
i=1000
while(--i)
{}

//is faster than

//C++
for(i = 999; i > -1; i--)
{}
    and

    Code:
    i++;
i++;
i++;
i++;
i++;
i++;

//is faster than

i+=6;

//(for numbers less than about 7
    Are these things true? And if so is it also true for .Net (managed programs)? Does anyone know if the original thread is still available.
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  2. Dec 18th, 2003, 06:19 AM #2
    kedaman
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    depends on what compiler you use
    Use
    writing software in C++ is like driving rivets into steel beam with a toothpick.
    writing haskell makes your life easier:
    reverse (p (6*9)) where p x|x==0=""|True=chr (48+z): p y where (y,z)=divMod x 13
    To throw away OOP for low level languages is myopia, to keep OOP is hyperopia. To throw away OOP for a high level language is insight.
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  3. Dec 18th, 2003, 09:53 AM #3
    PT Exorcist
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    I think that in good compilers the output will be about the same
    \m/\m/
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