July 2002
Intermediate to advanced
320 pages
8h 15m
English
Content preview from Hacker's Delight
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2-6. Shift Right Signed from Unsigned
If your machine does not have the shift right signed instruction, it may be computed using the formulas shown below. The first formula is from [GM], and the second is based on the same idea. Assuming the machine has mod 64 shifts, the first four formulas hold for 0 ≤ n ≤ 31, and the last holds for 0 ≤ n ≤ 63. The last formula holds for any n if by “holds” we mean “treats the shift amount to the same modulus as does the logical shift.”
When n is a variable, each formula requires five or six instructions on a basic RISC.
In the first two formulas, an alternative for the expression is 1 << 31 − n.
If n is ...
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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.