[PATCH] D90422: AArch64: Switch to x20 as the shadow base register for outlined HWASan checks.

[Peter Collingbourne via Phabricator via cfe-commits]

pcc added a comment.

For the kernel I measured a small regression in boot time (with a version of this change that uses x20 for the v1 checks as well since the kernel doesn't use short granules yet) -- from 6.65s to 6.70s or 0.8%. But that's a fraction of the size gains which were 4% for kernel and (as mentioned) 3% for userspace.


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  https://reviews.llvm.org/D90422/new/

https://reviews.llvm.org/D90422