[Mlir-commits] [mlir] [MLIR][Linalg] Introduce broadcast/transpose semantic to 'linalg.batc… (PR #122275)

[Md Asghar Ahmad Shahid]

================
@@ -3450,6 +3467,95 @@ static LogicalResult verifyExtendedMatmulSemantic(MatmulOp matmulOp,
   return success();
 }
 
+/// Checks if the given AffineMap represents a valid batch dimension.
+/// It checks if the first result dimension is a function of the first
+/// dimension.
+static bool isValidBatchDim(AffineMap bcastMap) {
+  AffineExpr exp = bcastMap.getResult(0);
+  return exp.isFunctionOfDim(0);
+}
+
+/// Checks if the given AffineMap's result dimensions are valid output result
+/// dimensions.
+static bool isValidOutputResultDim(AffineMap outputMap) {
+  enum Indices { batchPos, mPos, nPos };
+  AffineExpr exp0 = outputMap.getResult(batchPos);
+  AffineExpr exp1 = outputMap.getResult(mPos);
+  AffineExpr exp2 = outputMap.getResult(nPos);
+  return exp0.isFunctionOfDim(batchPos) && exp1.isFunctionOfDim(mPos) &&
+         exp2.isFunctionOfDim(nPos);
+}
+
+// Check general validity of input indexing map.
+static LogicalResult verifyInputMaps(BatchMatmulOp batchMatmulOp,
+                                     AffineMap opIndexingMap,
+                                     AffineMap defaultIndexingMap, bool isLHS) {
+  // Check the result dims are valid.
+  if (!isValidResultDimExprs(opIndexingMap, defaultIndexingMap))
+    return batchMatmulOp->emitOpError()
+           << "Unexpected dim expression in map result.";
+
+  // Check for valid number of result dims of input maps.
+  if (opIndexingMap.getNumResults() > 3)
+    return batchMatmulOp->emitOpError()
+           << "no. of result dim expression cannot exceed 3.";
+
+  // Check if the requested broadcast is valid.
+  if (isBroadcasted(opIndexingMap, defaultIndexingMap)) {
+    if (!batchMatmulOp.isValidLhsRhsBroadcastMap(opIndexingMap, isLHS))
+      return batchMatmulOp->emitOpError() << "Invalid broadcast requested.";
----------------
shahidact wrote:

The tests to this effect are present in `invalid.mlir` file, for example `invalid_bcast_batch_matmul_a`.

https://github.com/llvm/llvm-project/pull/122275