Florian Hahn f8734a5e10 [SCEV] Introduce SCEVUse, use it instead of const SCEV * (NFCI). (#91961) ...

This patch introduces SCEVUse, which is a tagged pointer containing the
used const SCEV *, plus extra bits to store NUW/NSW flags that are only
valid at the specific use.

This was suggested by @nikic as an alternative
to https://github.com/llvm/llvm-project/pull/90742.

This patch just updates most SCEV infrastructure to operate on SCEVUse
instead of const SCEV *. It does not introduce any code that makes use
of the use-specific flags yet which I'll share as follow-ups.

Compile-time impact: https://llvm-compile-time-tracker.com/compare.php?from=ee34eb6edccdebc2a752ffecdde5faae6b0d5593&to=5a7727d7819414d2acbc5b6ab740f0fc2363e842&stat=instructions%3Au

2026-03-13 16:23:06 +00:00

28 KiB

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