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b. Implements Bitwise Operations | initial writing: 2001-11-22 last updated: 2004-10-26

The adverb`m b.` has been extended to compute bitwise functions on integer arguments. An argument atom is treated as a list of length`w` of bits, where`w` is the word size of the underlying machine.`m=16+k` specifies the boolean function whose ravelled function table is`#:k` .`` For example,`17 b.` specifies bitwise and`` (`17` ↔`16+1` ↔`16+#.0 0 0 1`). There is special code to effect efficient execution of the following cases:

| `m b."r` | `` | monad and dyad
| `m b./` | `` | monad and dyad
| `m b./\` | `` | monad
| `m b./\.` | `` | monad

Finally,`32 b.` specifies rotate,`33 b.` specifies shift, and`34 b.` specifies signed shift.
See also the`` `b.` entry in the dictionary.
Examples:

       12345 (17 b.) 67890           bitwise and
    48
       f=: (32#2)&#: { '.x'"_
       f 12345 67890 48
    ..................xx......xxx..x
    ...............x....x..x..xx..x.
    ..........................xx....

       _12345 (23 b.) 67890          bitwise or
    _12297
       f _12345 67890 _12297
    xxxxxxxxxxxxxxxxxx..xxxxxx...xxx
    ...............x....x..x..xx..x.
    xxxxxxxxxxxxxxxxxx..xxxxxxxx.xxx

       20 b./~ i.10                  bitwise less than table
    0 1 2 3 4 5 6 7 8 9
    0 0 2 2 4 4 6 6 8 8
    0 1 0 1 4 5 4 5 8 9
    0 0 0 0 4 4 4 4 8 8
    0 1 2 3 0 1 2 3 8 9
    0 0 2 2 0 0 2 2 8 8
    0 1 0 1 0 1 0 1 8 9
    0 0 0 0 0 0 0 0 8 8
    0 1 2 3 4 5 6 7 0 1
    0 0 2 2 4 4 6 6 0 0

       23 b./\ 2^i.10                cumulative bitwise or
    1 3 7 15 31 63 127 255 511 1023

       _5 (33 b.) 12345              shift
    385
       f 12345 385
    ..................xx......xxx..x
    .......................xx......x

       _5 (33 b.) _12345              shift
    134217342
       f _12345 134217342
    xxxxxxxxxxxxxxxxxx..xxxxxx...xxx
    .....xxxxxxxxxxxxxxxxxx..xxxxxx.

       _5 (34 b.) _12345              signed shift
    _386
       f _12345 _386
    xxxxxxxxxxxxxxxxxx..xxxxxx...xxx
    xxxxxxxxxxxxxxxxxxxxxxx..xxxxxx.

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