[PATCH] D32663: [SCEV] createAddRecFromPHI: Optimize for the most common case.

[Michael Zolotukhin via Phabricator via llvm-commits]

mzolotukhin added a comment.

Thanks for taking a look, I've updated the patch.

The change in `2014-08-29-CompactUnwind.ll` is caused by the fact that SCEV started to produce a simpler expression for `%iv.i`, which allowed LSR to optimize the test harder. The test seems to exercise instructions positions, so I tried to keep them untouched with this change. It's still a question why the original SCEV algorithm failed to construct the simpler expression for this case, I'll take a look at it later if I find a time.

Michael


https://reviews.llvm.org/D32663