The tools report path segmentation in the log file. This happens when you apply the constraints. You must avoid it by using valid startpoints and endpoints:
- Startpoints
- Clock, clock pin, sequential cell (implies valid startpoint pins of the cell), input or inout port.
- Endpoints
- Clock, input data pin of sequential cell, sequential cell (implies valid endpoint pins of the cell), output or inout port.
For details on path segmentation, refer to this link in the Vivado Design Suite User Guide: Using Constraints (UG903).