tree 88e806f85c3b17a983b04e6da2ecc2079b7d67db
parent c737d4d203210f96919f4406e5b815b0946535ab
author Nikita Popov <nikita.ppv@gmail.com> 1638270143 +0100
committer Nikita Popov <nikita.ppv@gmail.com> 1638292874 +0100

[SCEV] Track and invalidate ValuesAtScopes users

ValuesAtScopes maps a SCEV and a Loop to another SCEV. While we
invalidate entries if the left-hand SCEV is invalidated, we
currently don't do this for the right-hand SCEV. Fix this by
tracking users in a reverse map and using it for invalidation.

This is conceptually the same change as D114738, but using the
reverse map to avoid performance issues.

Differential Revision: https://reviews.llvm.org/D114788