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16 Jan 2014
SHR Instruction - Examples. • The following instruction sequence shifts the AL once to the right, with the lowest bit copied into the Carry flag and the highest bit cleared: • moval, D0h. ; AL = 11010000b shr al, 1. ; AL = 01101000b, CF = 0. • SHR can be used to perform a high-speed division by 2n: mov dl, 32.
shl{bwl} %cl, r/m[8|16|32] sar{bwl} imm8, r/m[8|16|32] sar{bwl} %cl, r/m[8|16|32] shr{bwl} imm8, r/m[8|16|32] sal{bwl} %cl, r/m[8|16|32] Example. Right shift, count specified by the constant (253), the 8-bit contents of the effective address (addressed by the ESI register plus an offset of 1): sarb $253, 1(%esi). Right shift, count
In a logical shift instruction (also referred to as unsigned shift), the bits that slide off the end disappear (except for the last, which goes into the carry flag), and the spaces are always filled with zeros. shr dest, src, Intel syntax Other examples (decimal numbers are used instead of binary number to explain the concept)
The SAR and SHR instructions can be used to perform signed or unsigned division, respectively, of the destination operand by powers of 2. For example, using the SAR instruction to shift a signed integer 1 bit to the right divides the value by 2. Using the SAR instruction to perform a division operation does not produce the
The shr or sar instruction is used to shift the bits of the operand destination to the right, by the number of bits specified in the count operand. Bits shifted beyond the destination are first shifted into the CF flag.
Right Shift Instructions. The shr (shift right) instruction shifts the bits in the destination to the right. Zeros are shifted into the leftmost bit positions and the last bit shifted out goes into CF; Effect on flags: SF, PF, ZF reflect the result; AF is undefined; CF = last bit shifted out; OF = 1 if result changes sign on last shift. SHR example.
My book gives the next example: Before shift: AL = 10101110 ; shr AL, 1 ; After shift: 01011100, CF = 1 ; Is it mistake? If that's what it says, then yes. That's a left shift ( shl AL, 1 ), not a right shift: the bits in AL have all been moved left by one place, and the carry flag has been set to the bit that was shifted out of the left-hand
1 Jan 2017 For example, there is a 16-bit subset of the x86 instruction set. Using the 16-bit . Here we illustrate some examples using the mov instruction that moves data between registers and memory. . shr ebx, cl — Store in EBX the floor of result of dividing the value of EBX by 2n wheren is the value in CL.
<<< Shift Instructions · Index · Shift Instructions Examples >>>. 38. SHL and SHR Shift Instructions. Bit shifted out goes into the carry flag CF. Zero bit is shifted in at the other end: SHL Instruction. SHR Instruction. <<< Shift Instructions · Index · Shift Instructions Examples >>>
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