[Bug fortran/38205] Tranformational function SUM rejected in initialization expressions

["burnus at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from burnus at gcc dot gnu dot org  2008-11-26 16:52 -------
> I think that patch is not enough (though useful!). I think one needs to add a
> gfc_simplify_sum to simplify.c

One probably needs an auxiliary function which iterates through an array either
along a dim= (-> return a scalar) or if not present, it returns a expr->rank
sized array. To be used with PRODUCT and SUM at least. gfc_simplify_reshape
might give some idea, though that assumes that source is a rank == 1 array.
(Maybe get_expr_storage_size gives also some ideas.)

Currently not simplified are:
- ALL/ANY/COUNT
- cshift/eoshift
- dot_product/matmul
- (max|min)(loc|val) - note: (max|min)val is implemented for rank == 1 w/o dim
- pack/unpack
- spread
- transpose


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38205