6 Commits

Author	SHA1	Message	Date
Philip Reames	eede4846a9	[SCEV] Allow negative steps for LT exit count computation for unsigned comparisons ... This bit of code is incredibly suspicious. It allows fully unknown (but potentially negative) steps, but not steps known to be negative. The comment about scev flag inference is worrying, but also not correct to my knowledge. At best, this might be covering up some related miscompile. However, there's no test in tree for it, the review history doesn't include obvious motivation, and the C++ example doesn't appear to give wrong results when hand translated to IR. I think it's time to remove this and see what falls out. During review, there were concerns raised about the correctness of the corresponding signed case. This change was deliberately narrowed to the unsigned case which has been auditted and appears correct for negative values. We need to get back to the known-negative signed case, but that'll be a future patch if nothing falls out from this one. Differential Revision: https://reviews.llvm.org/D104140	2021-09-09 14:09:29 -07:00
Arthur Eubanks	50153213c8	[test][NewPM] Remove RUN lines using -analyze ... Only tests in llvm/test/Analysis. -analyze is legacy PM-specific. This only touches files with `-passes`. I looked through everything and made sure that everything had a new PM equivalent. Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D109040	2021-09-02 11:38:14 -07:00
Philip Reames	e9d4bb43f8	[tests] SCEV trip count w/ neg step and varying rhs	2021-07-23 17:19:46 -07:00
Philip Reames	5c57600b93	[tests] Precommit test for D104140	2021-07-16 10:57:59 -07:00
Philip Reames	2b3a4c7d72	[test] Extend negative stride backedge tests to cover signed comparisons	2021-07-16 10:29:22 -07:00
Philip Reames	6dad7a51f8	[SCEV] Add tests for known negative strides in trip count logic	2021-07-16 10:08:31 -07:00