[llvm] r182603 - ARM: implement @llvm.readcyclecounter intrinsic

[JF Bastien]

> I tend to think the issues around using these counters (multiple CPUs,
> task switching, ...) are subtle enough that we should rely on the user
> to know when it's sensible. There's no magical "I want to time a loop"
> predicate we could implement, and I wouldn't want to give the
> impression there is.
>

What I meant was that having an intrinsic to test for support would also be
useful.

Are there any OSes that ship with this turned on for user-mode by default?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20130524/1fd2757d/attachment.html>