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Tracked it down to an integer overflow---the total wire length exceeds a 32 bit value.  There's another bug here that's getting fixed, too, where graywolf used a value (define) \"OVER_HEAD\" to pad out an array, but then would expand into that array assuming that it wouldn't exceed that overhead and write outside of the array.  But again, for a large design like the AES, I found it doing just that, and had to add code to specifically check for out-of-bounds access and increase the array size when 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