22.214.171.124. Guideline: Flatten the Hierarchy During Synthesis
If you are using Intel® Quartus® Prime incremental compilation, you cannot flatten your design across design partitions. Incremental compilation always preserves the hierarchical boundaries between design partitions, and the synthesis does not flatten it across partitions. Follow Intel’s recommendations for design partitioning, such as registering partition boundaries to reduce the effect of cross-boundary optimizations.
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