Re: eliminating array bounds checking overhead

nr@labrador.eecs.harvard.edu (Norman Ramsey)
27 Apr 2000 10:52:26 -0400

          From comp.compilers

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From: nr@labrador.eecs.harvard.edu (Norman Ramsey)
Newsgroups: comp.compilers
Date: 27 Apr 2000 10:52:26 -0400
Organization: Harvard University
References: 00-04-194
Keywords: optimize

<mayur_naik@my-deja.com> wrote:
>if (i > lo && i < hi)
> printf("%d", A[i]);
>else
> printf("index out of bounds");
>
>... I want to eliminate the overhead of the 2 less-than tests


Bonus trick, which I learned from Andrew Appel:


    ((unsigned)(i-(lo+1)) < hi)


Beware fencepost errors.
--
Norman Ramsey
http://www.eecs.harvard.edu/~nr


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