[PATCH] Add HLE target feature

[Michael Liao]

metadata is also part of IR. - michael

On Wed, 2013-02-20 at 17:55 -0800, Jeffrey Yasskin wrote:
> On Wed, Feb 20, 2013 at 5:42 PM, Nadav Rotem <nrotem at apple.com> wrote:
> > Michael,
> >
> > Thanks for the explanation. I think that the question that we need to ask
> > ourselves is, does this belong in the compiler ?  Before we design beautiful
> > abstraction that will add to the complexity of the compiler we need to know
> > if the complexity is worth it.  Michael, are you committed to doing
> > __optimization__ work to support transactional memory ? If so, how will this
> > work benefit others ?  To my understanding, transactional memory is not
> > something that is going to benefit many people.
> 
> These instructions will benefit many people. They have the potential
> to speed up both atomic implementations and any user code that uses
> mutexes whose implementation takes advantage of them. Don't judge
> these instructions by previous attempts at transactional memory.
> 
> That I see large benefits from them doesn't necessarily mean I think
> they need to be metadata on the atomic instructions as opposed to
> x86-specific intrinsics. I think we need to see the specification in
> the IR before coming to any conclusions about that.
> 
> Jeffrey