[Openmp-commits] [PATCH] D73077: [libomptarget] Implement wavefront functions for amdgcn

Jon Chesterfield via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Mon Jan 27 05:02:19 PST 2020

JonChesterfield marked an inline comment as done.
JonChesterfield added inline comments.

Comment at: openmp/libomptarget/deviceRTLs/amdgcn/src/target_impl.hip:21-22
+// initialized with a 64-bit mask with bits set in positions less than the
+// thread's lane number in the warp
+DEVICE __kmpc_impl_lanemask_t __kmpc_impl_lanemask_lt() {
JonChesterfield wrote:
> arsenm wrote:
> > What about wave32?
> Hi Matt. I didn't think we had any 32 bit warp / wavefront hardware support in tree. If we do there's some changes needed elsewhere in this library as well
Ah. gfx1010 has some code in clang, e.g. https://reviews.llvm.org/D63209

I'd still like to land this patch as it progresses support for most amdgcn.

I'll also start the task of supporting wave32. The complicated part is probably detecting what a given arch uses early enough to pick out the right typedef for lanemask_t.

  rG LLVM Github Monorepo



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