rectangular iteration space

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dmikh

rectangular iteration space

Post by dmikh »

There is a restriction for loops 2.5.1 (p42, l3-4) "The loops must form a rectangular iteration space and the bounds and stride of each loop must be invariant in every loop". But what is "rectangular iteration space"? Do the following loops form a non-rectangular iteration space?

Code: Select all

#pragma omp for collapse(3)
    for (i=1; i<10; i++)
      for (j=i; j<10; j++)
        for (k=j; k<10; k++)
          ;

lfm
Posts: 135
Joined: Sun Oct 21, 2007 4:58 pm
Location: OpenMP ARB

Re: rectangular iteration space

Post by lfm »

No, it is not rectangular. We're working on cleaning up the wording. The invariant requirement is supposed to disallow this case.

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