tree ba95e34624a76d84eb5a5858ca1b916efa2353d2
parent eff1f9f51091e86c205f917e64169eac18f4f4ec
author Peter Collingbourne <peter@pcc.me.uk> 1619156461 -0700
committer Copybara-Service <copybara-worker@google.com> 1620612557 -0700

scudo: Store header on deallocation before retagging memory.

From a cache perspective it's better to store the header immediately
after loading it. If we delay this operation until after we've
retagged it's more likely that our header will have been evicted from
the cache and we'll need to fetch it again in order to perform the
compare-exchange operation.

For similar reasons, store the deallocation stack before retagging
instead of afterwards.

Differential Revision: https://reviews.llvm.org/D101137

GitOrigin-RevId: 0a5576ecf05f810065b6562605f1cbe78fee2988