2 Commits

Author	SHA1	Message	Date
Sanjay Patel	9d6d24c250	[JumpThreading][VectorUtils] avoid infinite loop on unreachable IR ... https://llvm.org/PR48362 It's possible that we could stub this out sooner somewhere within JumpThreading, but I'm not sure how to do that, and then we would still have potential danger in other callers. I can't find a way to trigger this using 'instsimplify', however, because that already has a bailout on unreachable blocks.	2020-12-02 13:39:33 -05:00
Wei Mi	55a68a2400	[JumpThreading] Stop searching predecessor when the current bb is in a ... unreachable loop. updatePredecessorProfileMetadata in jumpthreading tries to find the first dominating predecessor block for a PHI value by searching upwards the predecessor block chain. But jumpthreading may see some temporary IR state which contains unreachable bb not being cleaned up. If an unreachable loop happens to be on the predecessor block chain, keeping chasing the predecessor block will run into an infinite loop. The patch fixes it. Differential Revision: https://reviews.llvm.org/D65310 llvm-svn: 367154	2019-07-26 20:59:22 +00:00