[libc-commits] [libc] [libc] Rework the RPC interface to accept runtime wave sizes (PR #80914)

[Jon Chesterfield via libc-commits]

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@@ -144,6 +139,17 @@ template <bool Invert, typename Packet> struct Process {
     atomic_thread_fence(cpp::MemoryOrder::ACQUIRE);
   }
 
+  /// The packet is a linearly allocated array of buffers used to communicate
+  /// with the other process. This function returns the appropriate slot in this
+  /// array such that the process can operate on an entire warp or wavefront at
+  /// once.
+  LIBC_INLINE Buffer *get_packet(uint32_t index) {
+    if constexpr (lane_size == DEFAULT_LANE_SIZE)
+      return &packet[index * gpu::get_lane_size()];
+    else
+      return &packet[index * lane_size];
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JonChesterfield wrote:

this is dubious. Just have the non-GPUs report a lane size of 1 and get rid of the DEFAULT_LANE_SIZE construct

https://github.com/llvm/llvm-project/pull/80914