booth: Fix vacancy check when summing down result #3982
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In commit fedd122 ("booth: Move away from explicit `Wire` pointers") a bug was introduced when checking for vacant slots in arrays holding some intermediate results. Non-wire SigBit values were taken to imply a vacant slot, but actually a constant one can make its way into those results, if the multiplier cell configuration is just right. Fix the vacancy check to address the bug.
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In commit fedd122 ("booth: Move away from explicit
Wirepointers") a bug was introduced when checking for vacant slots in arrays holding some intermediate results. Non-wire SigBit values were taken to imply a vacant slot, but actually a constant one can make its way into those results, if the multiplier cell configuration is just right. Fix the vacancy check to address the bug.