[PATCH] D12246: [NVPTX] change threading intrinsics from noduplicate to convergent

[Owen Anderson via llvm-commits]

> On Aug 31, 2015, at 5:57 PM, Mehdi Amini <mehdi.amini at apple.com> wrote:
> 
> 
> if (b) {
>     for (int i = 0; i < 100; ++i) {
>        // do something
>     __syncthreads();
>   }
> } else {
>    for (int i = 0; i < 100; ++i) {
>       __syncthreads();
>   }
> }
> 
> I think it would match your constraint, i.e. "they are be executed in under the same set of execution predicates as where the user wrote them”. 

I would not consider this to match the convergent constraint.  Each of the __syncthreads() calls after unswitching executes under a subset of the predicates under which the original executed.

—Owen
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20150831/c3d5458f/attachment.html>