Thread View: net.lang.mod2
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Started by joel
Tue, 05 Aug 1986 00:25
Re: Bit stripping
Author: joel
Date: Tue, 05 Aug 1986 00:25
Date: Tue, 05 Aug 1986 00:25
14 lines
971 bytes
971 bytes
Yet another way to accomplish stripping off the parity bit is using set
arithmetic.
ch := char(bitset(ch) * bitset{0..6}))
Of course, this may not generate great code either. Mike Powell's compiler
for the VAX generates an extra mcoml instruction on the constant 127, rather
than complementing at compile-time. (No AND instruction, just an AND NOT
instruction on the VAX.)
--
- Joel McCormack {ihnp4 decvax ucbvax allegra}!decwrl!joel
joel@decwrl.arpa
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