Difference between revisions of "Optimizing the Pipeline in our Floating Point Architectures (1S)"
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Revision as of 19:29, 5 August 2022
- Type: Semester Thesis
- Professor: Prof. Dr. L. Benini
Floating-point (FP) arithmetic is fundamental for a large set of applications spanning from high-performance computing to neural network training. FP architectures usually show a large critical path and need to be pipelined to match the system’s operating frequency. A flexible highly-parametrized open-source floating-point unit (FPU) called FPnew [1,2] has been developed at IIS.
FPnew is optimized for high-performance and energy efficiency. It is internally organized in modules, each one carrying out one operation group (add/mul, divsqrt, cast, comparisons, dot-product). Each operation group block (except the DivSqrt module which implements an iterative algorithm) contains a parametrized number of pipeline registers. Currently, all the registers are placed close to the input boundaries, and the timing is optimized during the backend. However, this can make the backend a longer and more complex process. The goal of this project is to manually place the pipeline registers optimizing for timing, and compare them against the baseline implementation.
- Investigation of the FPU timing. This will require you to
- Understand what are the critical paths in the unit
- How the critical paths are broken when inserting different numbers of pipeline registers
- RTL modifications to FPnew to manually optimized the pipeline for different numbers of pipeline registers
- Implementation of a Python generator that takes the number of pipeline levels as an input and places the registers in the position you identified
- 15% Literature / architecture review
- 30% RTL implementation
- 40% Evaluation
- 15% Python generator
- Strong interest in computer architecture
- Experience with digital design in SystemVerilog as taught in VLSI I
- Experience with ASIC implementation flow (synthesis) as taught in VLSI II
 https://ieeexplore.ieee.org/abstract/document/9311229 FPnew: An Open-Source Multiformat Floating-Point Unit Architecture for Energy-Proportional Transprecision Computing