3 Commits

Author	SHA1	Message	Date
Max Kazantsev	2c7d5fbc9e	[SCEV] Generalize implication when signedness of FoundPred doesn't matter ... The implication logic for two values that are both negative or non-negative says that it doesn't matter whether their predicate is signed and unsigned, but only flips unsigned into signed for further inference. This patch adds support for flipping a signed predicate into unsigned as well. Differential Revision: https://reviews.llvm.org/D109959 Reviewed By: nikic	2021-09-21 11:17:56 +07:00
Max Kazantsev	def15c5fb6	[SCEV] Support negative values in signed/unsigned predicate reasoning ... There is a piece of logic that uses the fact that signed and unsigned versions of the same predicate are equivalent when both values are non-negative. It's also true when both of them are negative. Differential Revision: https://reviews.llvm.org/D109957 Reviewed By: nikic	2021-09-20 11:26:33 +07:00
Max Kazantsev	690f76958a	[Test] Add simple test where IndVars fails to remove checks on negative values	2021-09-17 15:40:32 +07:00