[LLVMdev] RFC: Are we ready to completely move away from the optionality of a DataLayout?
echristo at gmail.com
Mon Oct 20 22:41:53 PDT 2014
On Mon, Oct 20, 2014 at 9:11 PM, Chris Lattner <clattner at apple.com> wrote:
> On Oct 20, 2014, at 8:22 PM, Eric Christopher <echristo at gmail.com> wrote:
>> On Mon, Oct 20, 2014 at 7:51 PM, Chris Lattner <clattner at apple.com> wrote:
>>> Hi Eric,
>>> Can you elaborate on your goals and what problem you are trying to solve? As Chandler points out, DataLayout is part of module for a reason.
>> Which is an interesting point - it's not really. (This was also going
>> to be part of my talk next week, but since it's been brought up...)
>> So the storage for DataLayout right now is on a per-subtarget basis.
>> I.e. if you don't construct one in the module the backend will make
>> one up based on information in the subtarget (everything from
> I think this is what Chandler is proposing to fix: every module will have a DataLayout string.
Right. I was figuring there'd be some way of having the backend
specify it if there isn't one in the module IR - or a way of calling
into the backend to generate one up since memorizing all of the
possible target layouts for all of the targets would probably be a
pain. These bits would probably be off of the TargetMachine right now.
It'd make moving the DataLayout string onto the TargetMachine easier
later if we decide to do that.
More information about the llvm-dev