[GitHub] [tvm] NicolaLancellotti commented on a diff in pull request #10959: [microNPU] Add a pass to reorder copy and compute nodes

[GitBox <gi...@apache.org>]

NicolaLancellotti commented on code in PR #10959:
URL: https://github.com/apache/tvm/pull/10959#discussion_r848549306


##########
src/tir/contrib/ethosu/passes.cc:
##########
@@ -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]};

Review Comment:
   Done.



##########
src/tir/contrib/ethosu/passes.cc:
##########
@@ -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};

Review Comment:
   Done.



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