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Under most circumstances, if SCEV can simplify X-Y to a constant, then it can also simplify Y-X to a constant. However, there is no guarantee that this is always true, and concensus is not to consider that a correctness bug in SCEV (although it is undesirable). PPCLoopPreIncPrep gathers pointers used to access memory (via loads, stores and prefetches) into buckets, where in each bucket the relative pointer offsets are constant. We used to keep each bucket as a multimap, where SCEV's subtraction operation was used to define the ordering predicate. Instead, use a fixed SCEV base expression for each bucket, record the constant offsets from that base expression, and adjust it later, if desirable, once all pointers have been collected. Doing it this way should be more compile-time efficient than the previous scheme (in addition to making the implementation less sensitive to SCEV simplification quirks). Fixes PR25170. llvm-svn: 252417 |
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