7e55c62cac
Now that we have an efficient algorithm to analyse which bits in a combinational cycle are not dependent on the cycle, can simplify the cycle fixup algorithms. Remove FixUpSelDrivers: this was a heuristic to save on the expensive independent bits analysis, but itself can cause a performance problem on certain inputs that result in a large number of attempted fixups. Doing this simplifies the driver tracing algorithm, and because we now only attempt to trace drivers that are known to be independent of the cycles, it should always succeed... Unless of course there is a mismatch between the independent bit analysis ant the driver tracing algorithm. In such case (when we managed to prove independence, but then fail to trace a driver), we will crash, which is still easier to sv-bugpoint than a performance bug. Fixes #6744 |
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