[SCEV][NFC] Check NoWrap flags before lexicographical comparison of SCEVs
Lexicographical comparison of SCEV trees is potentially expensive for big
expression trees. We can define ordering between them for AddRecs and
N-ary operations by SCEV NoWrap flags to make non-equality check
cheaper.
This change does not prevent grouping eqivalent SCEVs together and is
not supposed to have any meaningful impact on behavior of any transforms.
Reviewed By: sanjoy
Differential Revision: https://reviews.llvm.org/D40645
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319889
91177308-0d34-0410-b5e6-
96231b3b80d8
OSDN Git Service
