That's why you need to formal, and then formal your formal. https://github.com/ucb-bar/riscv-torture/issues/11 …pic.twitter.com/GPM5UYeKgb
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This is a trivial bug for a conventional test suite to find. Formal shines brightest on complex sequences/timings.
With PicoRV32 it seems I found those problems all with the other formal methods I used before I started my work on riscv-formal.
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Essentially comparing the behavior of two PicoRV32 cores (same or different config) on the same memory image but with different timings.
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So all the problems that are left here are related to ISA compliance where PicoRV32 consistently was not conforming to the ISA spec.
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