6cdee8f3d8
Summary: The NVIDIA ITS protocol allows lanes to diverge inside of a warp. We previously had contingencies around this, but there were cases where issues would still show up under highly stressed usage. The rules state that as long as the PC is the same, threads can reconverge. This means that we can see a 'convergent' warp even when they took completely divergent paths to get there. This resulted in the 'index' value in the RPC port lookup loop thinking we were in a convergent group while all the indices were different. Fix this with a broadcast to force the expected behavior Additionally, we did not force that the threads were actually done with their 'work_fn'. If the work included something that caused divergence the other threads could continue and toggle the mailbox, resulting in the server seeing unfinished work. Fix this with an explicit sync and have one thread do it. Add a test to make sure this actually works.
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.