logical shift

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logical shift

[′läj·ə·kəl ′shift]
(computer science)
A shift operation that treats the operand as a set of bits, not as a signed numeric value or character representation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

logical shift

(programming)
(Either shift left logical or shift right logical) Machine-level operations available on nearly all processors which move each bit in a word one or more bit positions in the given direction. A left shift moves the bits to more significant positions (like multiplying by two), a right shift moves them to less significant positions (like dividing by two). The comparison with multiplication and division breaks down in certain circumstances - a logical shift may discard bits that are shifted off either end of the word and does not preserve the sign of the word (positive or negative).

Logical shift is approriate when treating the word as a bit string or a sequence of bit fields, whereas arithmetic shift is appropriate when treating it as a binary number. The word to be shifted is usually stored in a register, or possibly in memory.
References in periodicals archive ?
* Round Function: "XOR, LEFT, RIGHT SHIFT" can be used to keep code size, RAM foot print small and execution time low.
If [A.sub.e] > [B.sub.e] Right shift [B.sub.m] that many positions to form [B.sub.m] [2.sup.Be-Ae]
The proposed optimized reversible binary logarithmic right shift barrel shifter & GRS-bit Generation Component for floating point operation:
Thus, the main implication of RS (Right Shift) theory is that, the mechanism that induces preferential change to the right is operating in very early stages of human development, even before the development of the cerebral cortex.
Defensive stalwart Steve Palmer, son of Wolves legend Geoff Palmer, says getting the right shift pattern at work is a bonus, let alone haggling over image rights or win fees.
"Our study does not reflect a right shift of the entire population, but a right shift of obesity towards extreme obesity," the authors explained.
A low-dose X-ray (LODOX) Statscan performed at the Tygerberg Forensic Pathology Laboratory demonstrated a left-sided tension pneumothorax, right shift of the mediastinum, depression of the left hemi-diaphragm, and collapse of the left lung, all of which were confirmed at autopsy (Fig.
Concerro's software and services offer a user experience that allows both staff and managers to collaborate on the entire work schedule, to ensure the right staff for the right shift. The ShiftRewards program includes a variety of financial incentive options, as well as point-based incentives.
(1) A so-called neutrophil right shift (that is, increase in the number of lobes), occurs in leukemias, chronic nephritis, diseases of the liver, cancer, sepsis, and vitamin B12, and folate deficiency.
Political forecasters pegged the results as a clear indication of a right shift in Israeli politics.
If you were on the right shift you could go to the farm opposite The Bull at Shotton and earn a few extra bob.
Professor Cass Sunstein ["Fighting for the Supreme Court," September] and Judge Stephen Reinhardt ["Originalist Sins," Letters, November] both decry the tectonic right shift of the federal courts.

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