return value.getDefiningOp();
}

// Check if the TPUCopyWithDynamicShapeOp is valid.
// 1. The op should be wrapped inside a launch op.
// 2. The wrapped launch op should be placed on CPU.
LogicalResult CheckOpIsValid(Operation* op) {
  auto launch_op = llvm::dyn_cast<tf_device::LaunchOp>(op->getParentOp());
  if (!launch_op) {
    op->emitError() << "TPUCopyWithDynamicShapeOp is not in a launch";
  }