[llvm-commits] [PATCH] Promote all possible memory to registers

[Kenneth Uildriks]

On Sat, Oct 23, 2010 at 9:04 AM, Chris Lattner <clattner at apple.com> wrote:
> Hi Kenneth,
>
> I haven't looked at the patch yet, but how is this different than the standard GVN pass?
>
> -Chris

Now that I've looked more closely at GVN, not different enough to
justify a new pass.

I believe it would benefit from having direct support for
llvm.invariant.begin and llvm.invariant.end added to it, for the
reasons I outlined in my first message.

I've noticed that instcombine does redundant load elimination,
strictly by querying memdep to find the corresponding stores rather
than doing top-down stored-value tracing like GVN does.  Does it
handle cases that GVN doesn't?