[Bug fortran/36928] array temporary for interleaving assignment

[tkoenig at gcc dot gnu dot org]

------- Comment #10 from tkoenig at gcc dot gnu dot org  2010-05-22 10:11 -------
I've gotten a bit further with this.

For x(la:ua:sa) = x(lb,ub,sb), there can be no collision

if abs(la-lb) mod gcd(sa, sb) == 0

where gcd is the greatest common divisor.

This will at least fix the test case from comment #1, and also cases like

a(2:x:2) = a(1:y:4).

but will not work in the cases where there is partial overlap only.

Also, it would be nice to have complete simplification so that cases like

a(2*n**2+3*n+1:x:2) = a(2*n**2+3*n:x:2)

can be caught.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36928