Until today, we compared two affine expressions by defining two maps describing
them, creating an union of those maps, adding constraints that do the comparison
and projecting out unneeded dimensions.
This was simplified to using the isl_pw_aff representation of the affine
expressions and using the relevant isl functions to compare them.
llvm-svn: 137932
At the moment, we still remove the ids after all data structures are created,
as later passes do not yet support ids. This limitation will be removed later.
llvm-svn: 137931
Do not use AffFunc to derive the affine expressions, but use isl_pw_aff to
analyze the original SCEV directly. This will allow several simplifications in
follow up patches, with the final goal of removing AffFunc completely.
llvm-svn: 137930
Instead of returning a pointer to the domain, we return a new copy of it. This
is safer, as we do not give access to internal objects. It is also not
expensive, as isl will just increment a reference counter.
llvm-svn: 131010
Tobias Grosser