[mlir][linalg] Memoize indexing map generation.

Differential Revision: https://reviews.llvm.org/D97602

Author: stellaraccident

mlir/lib/Dialect/Linalg/IR/LinalgOps.cpp

@@ -2333,8 +2333,11 @@ static void printNamedStructuredOpResults(OpAsmPrinter &p,
 template <typename NamedStructuredOpType>
 static void printNamedStructuredOp(OpAsmPrinter &p, NamedStructuredOpType op) {
   p << op.getOperationName();
-  p.printOptionalAttrDict(op->getAttrs(),
-                          /*elidedAttrs=*/{"operand_segment_sizes"});
+  p.printOptionalAttrDict(
+      op->getAttrs(),
+      /*elidedAttrs=*/{"operand_segment_sizes",
+                       // See generated code in mlir-linalg-yaml-gen.cpp
+                       "linalg.memoized_indexing_maps"});
 
   // Printing is shared with generic ops, except for the region and
   // attributes.

mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-yaml-gen.cpp

@@ -651,11 +651,18 @@ static SmallVector<AffineExpr> getSymbolBindings({0} self) {
       // {2}: Statements
       static const char structuredOpIndexingMapsFormat[] = R"FMT(
 ArrayAttr {0}::indexing_maps() {
+  static const char memoizeAttr[] = "linalg.memoized_indexing_maps";
+  ArrayAttr cached = getOperation()->getAttrOfType<ArrayAttr>(memoizeAttr);
+  if (cached)
+    return cached;
+
   MLIRContext *context = getContext();
   auto symbolBindings = getSymbolBindings(*this);
   SmallVector<AffineMap> maps;
   {2}
-  return Builder(context).getAffineMapArrayAttr(maps);
+  cached = Builder(context).getAffineMapArrayAttr(maps);
+  getOperation()->setAttr(memoizeAttr, cached);
+  return cached;
 }
 )FMT";