Henry Cejtin
Thu, 23 Aug 2001 21:29:52 -0500

Wait: bool arrays are 32 bits per entry, Word8Array's are 8 bits per entry,
and yet the latter are 6 times slower?  How could that be?
I just tried the version of MLton I have (2001-08-06) and with that the bool
version is epsilon faster (just under 1% faster).
For the test he is running (8K sieve), using a byte means it fits in the L1
cache, while a word means it doesn't.