Re: [gfortran] Avoid induction variables in DO loops.

[Daniel Berlin <dberlin at dberlin dot org>]

> Oh, I've got a mistake. The test taken by me recently
> is for mainline, not LNO branch.
>
> My newest test shows that LNO branch can do data
> dependence analysis for arrays with known bounds, but
> not unknown bounds.

This may or may not be correct, it's hard to say.
Yes it is true that our data dependence testing is still in the process of 
being written.
We have ZIV test, SIV test, and a partial MIV test done.
As written below, it may not fall into the MIV test portion we have 
implemented yet.
I honestly don't remember.

It would be good to know what your goal is.
IE why you care whether it can do this data dependence analysis or not.
Are you trying to perform some specific optimization?

I mean, you are welcome to implement the rest of the miv test if you like 
(see tree-data-ref.c:analyze_miv_subscript for what is currently 
implemented, however, it helps avoid duplicate work if we know what your 
plans are, as there may already be people working on what you want to do.


> subroutine array_ref (a, b, c, N)
>   real a(N, N), b(N, N), c(N, N)
>   do i = 1, N
>     do j = 1, N
>       c(j, i) = a(j, i) * b(j, i)
>     enddo
>   enddo
> end
>
>
>
> Canqun Yang
> Creative Compiler Research Group.
> National University of Defense Technology, China.