European Design and Automation Association
Conventional high-level synthesis uses the worst case delay to relate all inputs to all outputs of an operation. This is a very conservative approximation of reality, especially in arithmetic operations (where some bits are required later than others and some bits are produced earlier than others). This paper proposes a pre-synthesis optimization algorithm that takes advantage of this feature for more efficient high-level synthesis of data-flow graphs formed by additions and multiplications. The presented pre-processor analyzes the critical path at bit-granularity and splits the arithmetic operations into sub-words fragments.