July 2002
Intermediate to advanced
320 pages
8h 15m
English
Content preview from Hacker's Delight
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10-6. Incorporation into a Compiler
For a compiler to change division by a constant into a multiplication, it must compute the magic number M and the shift amount s, given a divisor d. The straightforward computation is to evaluate (6) or (18) for p = W, W + 1, … until it is satisfied. Then, m is calculated from (5) or (17). M is simply a reinterpretation of m as a signed integer, and s = p − W.
The scheme described below handles positive and negative d with only a little extra code, and it avoids doubleword arithmetic.
Recall that nc is given by
Hence |nc| can be computed from
The remainder must be evaluated using unsigned division, because ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.