[llvm] r232468 - [ARM] Add support for ARMV6K subtarget (LLVM)

[Renato Golin]

On 21 March 2015 at 22:04, Dimitry Andric <dimitry at andric.com> wrote:
> I've been looking at importing this patch into the 3.6.0 version of llvm/clang we have in FreeBSD head.  However, I don't see that it adds support for the CLREX instruction on ARMv6K [1]?

Hi Dimitry,

No, this patch only added the basic support and made some hints
available. CLREX, LDREX, STREX were not changed.


> In FreeBSD, we have been using a rather inelegant hack [2] for some time now, to enable this instruction for our default ARMv6 processor, e.g. arm1176jzf-s.  I would like to get rid of that...

It should be simple for you to send a patch to do that for all three
atomic instructions, with some tests of your own?

cheers,
--renato