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Shift and rotate instructions shift the bits in the destination operand by one or more positions either to the left or right. The instructions have two formats: The first shifts by one position, the second shifts by N positions, where cl contains N(cl is the only register which can be used)
The manner of shifting is dependent upon the specific shift instruction. In shift-left operations, zeros are shifted into low-order vacated positions. For example: Example of Shift (in this case, shift left) instruction. In shift right operations, bits that are shifted in can be: Zeros -- a logical shift right (SRA instruction); The original
Shift Instructions. The result of performing an n position right logical shift on a binary number containing m digits is obtained by: Removing the RIGHTMOST n digits from the original number; Shifting the remaining digits n positions to the right; Placing n zeros to the left of the resulting number. For example, performing a three
The resulting pattern is 0100 1110 . The MIPS processor always performs the operation on a 32-bit register and puts the result in a 32-bit register. sll d,s,shft # $d gets the bits in $s # shifted left logical # by shft positions, # where 0 ? shft < 32. The ALU (arithmetic/logic unit) which does the operation pays no attention to what
MIPS also has a shift right logical instruction. It moves bits to the right by a number of positions less than 32. The high-order bit gets zeros and the low-order bits are discarded. If the bit pattern is regarded as an unsigned integer, or a positive two's comp. integer, then a right shift of one bit position performs an integer divide
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Notes: 1. A shift in the range 1-8 may be written as immediate data; anything larger than 8 will be replaced by Nmod8. A shift in the range 0-63 may be contained in a data register Dm. 2. Use of the <ea> operand will result in a shift of exactly one bit. The size for this operand can only be word. 3. The result of the operation is
5 Nov 1998 A logical shift moves bits to the left or right. The bits which 'fall off' the end of the word are discarded and the word is filled with 0's from the opposite end. A logical right shift of the 8 bit binary number 1000 1011 gives 0100 0101, as shown below: tabular71. Shift instructions include a repeat value, which is
In computer science, a logical shift is a bitwise operation that shifts all the bits of its operand. The two base variants are the logical left shift and the logical right shift. This is further modulated by the number of bit positions a given value shall be shifted, such as shift left by 1 or shift right by n.
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