[llvm-dev] FYI, we've posted a component of Spectre mitigation on llvm-commits
Chandler Carruth via llvm-dev
llvm-dev at lists.llvm.org
Thu Jan 4 09:52:12 PST 2018
On Thu, Jan 4, 2018 at 12:31 PM Stephen Checkoway via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> > On Jan 4, 2018, at 04:23, Chandler Carruth via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> > Sending a note here as this seems likely to be of relatively broad
> It looks like this is producing code of the following form.
> call next
> jmp loop
> mov [rsp], r11
> As I understand it, the busy loop is to cause the speculative execution to
> be trapped in the loop. Was something like ud2 considered? I presume that
> would stop the speculative execution without involving any of the execution
> units the way the busy loop does.
The pause instruction will also avoid tying up execution resources in
speculative contexts, so I wouldn't expect it to be significantly different.
> Stephen Checkoway
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the llvm-dev