[LLVMdev] [RFC] Parallelization metadata and intrinsics in LLVM (for OpenMP, etc.)

Chris Lattner
Tue, 02 Oct 2012 04:26:54 -0000

On Oct 1, 2012, at 6:16 PM, greened at obbligato.org wrote:

> Sanjoy Das <sanjoy at playingwithpointers.com> writes:
>
>> In short, I propose a intrinsic based approach which hinges on the
>> concept of a "parallel map".  The immediate effect of using
intrinsics
>> is that we no longer have to worry about missing metadata.  Moreover,
>> we are still free to lower the intrinsics in a variety of ways --
>> including vectorizing them or lowering them to calls to an actual
>> openmp backend.
>
> I'll re-ask here since this is in its own thread.
>
> Why can't we just make ordinary function calls to runtime routines?

I agree.  I can't imagine any practical way that a metadata-based approach
could be preserved by optimizers.

-Chris