[RaiseImplicitCopy] Start of this pass

include/scalehls/Transforms/Passes.h

@@ -69,6 +69,7 @@ std::unique_ptr<Pass> createCreateMemrefSubviewPass();
 std::unique_ptr<Pass> createPromoteBufferPass();
 std::unique_ptr<Pass> createAffineStoreForwardPass();
 std::unique_ptr<Pass> createSimplifyMemrefAccessPass();
+std::unique_ptr<Pass> createRaiseImplicitCopyPass();
 std::unique_ptr<Pass> createReduceInitialIntervalPass();
 
 /// Directive optimization passes.

include/scalehls/Transforms/Passes.td

@@ -381,6 +381,16 @@ def SimplifyMemrefAccess : Pass<"scalehls-simplify-memref-access", "FuncOp"> {
   let constructor = "mlir::scalehls::createSimplifyMemrefAccessPass()";
 }
 
+def RaiseImplicitCopy : Pass<"scalehls-raise-implicit-copy", "FuncOp"> {
+  let summary = "Raise copy in affine loops to memref.copy";
+  let description = [{
+    This raise-implicit-copy pass will detect implicit copy in affine loops and
+    raise to memref.copy in order to eliminate redundant copies.
+  }];
+
+  let constructor = "mlir::scalehls::createRaiseImplicitCopyPass()";
+}
+
 def ReduceInitialInterval : Pass<"scalehls-reduce-initial-interval", "FuncOp"> {
   let summary = "Try to reduce the intiail interval";
   let description = [{

lib/Transforms/CMakeLists.txt

@@ -20,6 +20,7 @@ add_mlir_library(MLIRScaleHLSTransforms
   Memory/AffineStoreForward.cpp
   Memory/CreateMemrefSubview.cpp
   Memory/PromoteBuffer.cpp
+  Memory/RaiseImplicitCopy.cpp
   Memory/ReduceInitialInterval.cpp
   Memory/SimplifyMemrefAccess.cpp
   CreateRuntimeMain.cpp

lib/Transforms/Memory/RaiseImplicitCopy.cpp

@@ -0,0 +1,24 @@
+//===----------------------------------------------------------------------===//
+//
+// Copyright 2020-2021 The ScaleHLS Authors.
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Dialect/Affine/Analysis/LoopAnalysis.h"
+#include "mlir/Dialect/Affine/LoopUtils.h"
+#include "mlir/Dialect/Affine/Utils.h"
+#include "scalehls/Transforms/Passes.h"
+#include "scalehls/Transforms/Utils.h"
+
+using namespace mlir;
+using namespace scalehls;
+
+namespace {
+struct RaiseImplicitCopy : public RaiseImplicitCopyBase<RaiseImplicitCopy> {
+  void runOnOperation() override {}
+};
+} // namespace
+
+std::unique_ptr<Pass> scalehls::createRaiseImplicitCopyPass() {
+  return std::make_unique<RaiseImplicitCopy>();
+}