September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Shift and rotate instructions
Instructions of this group let us move bits within the destination operand, which is something we only partially have in high-level languages. We can shift, but we cannot rotate, neither can we implicitly specify arithmetic shifts (the selection of arithmetic or a logical shift is usually performed by high-level language implementation based on the type of data the operations are carried on).
Using shift instructions, in addition to their primary role of moving bits left or right a certain number of positions, is a simpler way to perform integer multiplication and division of the destination operand by powers of two. Additionally, two special shift instructions exist that let us move certain amount of bits from ...
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