[LLVMdev] RFC: PerfGuide for frontend authors

[Philip Reames]

> On Mar 1, 2015, at 2:27 AM, David Chisnall <David.Chisnall at cl.cam.ac.uk> wrote:
> 
>> On 24 Feb 2015, at 00:46, Philip Reames <listmail at philipreames.com> wrote:
>> 
>> - Use globals not inttoptr for runtime structures - this gives you dereferenceability information
> 
> Do we have a mechanism for specifying an address for a global?  The places I use inttoptr for runtime structures are all places outside of the JIT environment that I want to specify.  Being able to create anonymous globals at a specified address would be very helpful.
Not sure.  My use cases is using the getSymbolAddress mechanism in MCJIT.  Can anyone else comment?

Also, we could consider adding a deref(n) metadata to inttoptr or a deref.load metadata to loads to resolve this differently.  Either or both are reasonable; I just haven't gotten around to it yet.

> 
> David
>