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OSdata.com: assembly language 

OSdata.com

Assembly Language

shift and rotate instructions

summary

    This web page examines shift and rotate instructions in assembly language. Specific examples of instructions from various processors are used to illustrate the general nature of assembly language.

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shift and rotate

    Shift and rotate instructions move bit strings (or operand treated as a bit string).

    Shift instructions move a bit string (or operand treated as a bit string) to the right or left, with excess bits discarded (although one or more bits might be preserved in flags). In arithmetic shift left or logical shift left zeros are shifted into the low-order bit. In arithmetic shift right the sign bit (most significant bit) is shifted into the high-order bit. In logical shift right zeros are shifted into the high-order bit.

    Rotate instructions are similar to shift instructions, ecept that rotate instructions are circular, with the bits shifted out one end returning on the other end. Rotates can be to the left or right. Rotates can also employ an extend bit for multi-precision rotates.

    A swap instruction swaps the high and low order portions of a register or contents of a series of memory locations.

    The carry bit typically receives the last bit shifted out of the operand. Sometimes an extend bit will receive the last bit shifted out also. Somtimes an overflow bit is used to indicate a sign change has occurred.

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    Copyright © 2000, 2001 Milo

    Created: February 21, 2001 (from machcode.htm)

    Last Updated: March 29, 2001


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