masahi commented on a change in pull request #5727:
URL: https://github.com/apache/incubator-tvm/pull/5727#discussion_r435576740
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File path: src/tir/transforms/lower_thread_allreduce.cc
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@@ -478,9 +478,20 @@ class ThreadAllreduceBuilder final : public
StmtExprMutator {
// the warp size.
//
// TODO(tvm-team) reduction with a sub-warp of 8 or 16 threads.
+ // Note: The ROCm backend will only have warp reductions for now.
+ // Also, the warp/wavefron size differs (64 on rocm, 32 on cuda).
Review comment:
wavefront
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