On 2/19/2014 8:20 AM, John McKown wrote:
Going a bit OT on this, but this talk about bits - the testing and setting
thereof, makes me curious about why IBM doesn't simplify it a "bit" (pun
intended).
I think we have way to many instructions already <g>
I have a subroutine to maintain a bit table, and the code is relatively
simple (turn bit on or off, flip it, test it, find first off bit, find
first on, clear the table). The find functions are implemented with TRT
(need to maintain S/360 compatibility), and the rest are trivial.
As Bill Fairchild commented, memory is generally not critical, so things
like POPCNT aren't necessary because they can be done with a table.
Gerhard Postpischil
Bradford, Vermont
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