[PATCH] D136999: [AArch64] Lower READCYCLECOUNTER using MRS CNTVCT_EL0

[Sebastian Pop via Phabricator via llvm-commits]

sebpop added a comment.

Ping patch.

In the Linux kernel rdtsc for Arm64 is implemented with CNTVCT_EL0:

https://lore.kernel.org/patchwork/patch/1305380/

> The system register CNTVCT_EL0 can be used to retrieve the counter from
> user space.  Add rdtsc() for Arm64.


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