Case Study: Can you afford to ignore formal analysis?

This is a title I’d like to reuse some day for a case study in Hi-Lite, but right now it is the title of a very interesting paper published by EE Times: people from Alcatel-Lucent formally verified many properties of an ASIC design in a large communication system.

What is stricking is the similarity of the findings and the challenges with what we do in Hi-Lite, despite the very different nature of the properties verified in hardware and in software, and the different techniques involved. Pages 3 and 4, they detail the additional errors found by formal verification on a codebase already simulated, with actual examples of what simulation missed and why. Very instructive. Which leads them to propose to bring together simulation and formal verification on page 5.

Interestingly, the difficulties to bring these two worlds together are the same as the ones in software: different semantics in simulation and formal verification (ex 1 p 5) and non-executable annotations (ex 2 p 5). Good thing that we insisted on the same semantics in Hi-Lite for execution and formal verification, as well as executable annotations!

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