NicolaLancellotti commented on code in PR #10959:
URL: https://github.com/apache/tvm/pull/10959#discussion_r848550508
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src/tir/contrib/ethosu/passes.cc:
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@@ -110,6 +110,71 @@ tvm::transform::Pass HoistAllocates() {
TVM_REGISTER_GLOBAL("tir.contrib.ethos-u.HoistAllocates").set_body_typed(HoistAllocates);
+/*!
+ * \brief Reorders copy and compute nodes in such a way that independent DMA
copies,
+ * and computes happen in parallel.
+ */
+class CopyComputeReorderingMutator : public StmtExprMutator {
+ public:
+ CopyComputeReorderingMutator() {}
+
+ PrimFunc operator()(PrimFunc main_func) {
+ auto n{main_func.CopyOnWrite()};
+ n->body = this->VisitStmt(main_func->body);
+ return GetRef<PrimFunc>(n);
+ }
+
+ private:
+ Stmt VisitStmt_(const SeqStmtNode* op) override {
+ if (op->size() <= 1) {
+ return StmtExprMutator::VisitStmt_(op);
+ }
+
+ auto seq_stmt{GetRef<SeqStmt>(op)};
+ std::vector<Stmt> new_seq(seq_stmt->size());
+ std::copy(seq_stmt->seq.begin(), seq_stmt->seq.end(), new_seq.begin());
+ bool previous_stmt_is_copy{true}; // Do not move the first stmt if it is
a copy
+
+ for (size_t i{}; i < seq_stmt->size(); ++i) {
+ auto stmt{seq_stmt[i]};
+ auto args{stmt.as<EvaluateNode>()->value.as<CallNode>()->args};
+ bool stmt_is_copy{args[0].as<StringImmNode>()->value == "ethosu_copy"};
+ bool stmt_is_global_copy{stmt_is_copy &&
+ args[3].as<BufferLoadNode>()->buffer.scope() ==
"global"};
Review Comment:
I have added it in the pass documentation.
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