Re: Vector assignment semantics (was Re: latest trends in compiler optimization research?)

James J. Weinkam wrote:


(snip regarding array expressions)


> For both array expressions and array assignments all arrays involved
> must have the same number of dimensions and identical bounds.


There has been some discussion about this in comp.lang.fortran.


Fortran doesn't pass the lower bound in assumed shape arrays.


That is convenient in that one can do array operations on arrays with
the same shape but different lower bounds. On the other hand, passing
the lower bounds as PL/I does seems more consistent. Since you can't
use DEFINED on actual or dummy arguments, there isn't a convenient way
to fix it.


-- glen
[Fortran has backward compatibility issues going back to the 1950s.
You've always been able to pass any array element as an argument by
address, and it's up to your code to get the array shapes
right. The only descriptors are the lengths of character variables introduced
in F77. -John]

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