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  2. Barrel shifter - Wikipedia

    en.wikipedia.org/wiki/Barrel_shifter

    One way to implement a barrel shifter is as a sequence of multiplexers where the output of one multiplexer is connected to the input of the next multiplexer in a way that depends on the shift distance. A barrel shifter is often used to shift and rotate n-bits in modern microprocessors, [1] typically within a single clock cycle.

  3. x86 instruction listings - Wikipedia

    en.wikipedia.org/wiki/X86_instruction_listings

    Below is the full 8086/8088 instruction set of Intel (81 instructions total). [2] These instructions are also available in 32-bit mode, in which they operate on 32-bit registers (eax, ebx, etc.) and values instead of their 16-bit (ax, bx, etc.) counterparts.

  4. x86 Bit manipulation instruction set - Wikipedia

    en.wikipedia.org/wiki/X86_Bit_manipulation...

    While what these instructions do is similar to bit level gather-scatter SIMD instructions, PDEP and PEXT instructions (like the rest of the BMI instruction sets) operate on general-purpose registers. [12] The instructions are available in 32-bit and 64-bit versions. An example using arbitrary source and selector in 32-bit mode is:

  5. x86 assembly language - Wikipedia

    en.wikipedia.org/wiki/X86_assembly_language

    CX (Count register): Serves as a counter in loop, string, and shift/rotate instructions. Iterative operations often use CX to determine the number of times a loop or operation should execute. DX (Data register): Used in conjuction with AX for multiplication and division operations that produce results larger than 16 bits.

  6. Carry flag - Wikipedia

    en.wikipedia.org/wiki/Carry_flag

    Another example may be an 8-bit register with the bit pattern 01010101 and the carry flag set; if we execute a rotate left through carry instruction, the result would be 10101011 with the carry flag cleared because the most significant bit (bit 7) was rotated into the carry while the carry was rotated into the least significant bit (bit 0).

  7. Bitwise operation - Wikipedia

    en.wikipedia.org/wiki/Bitwise_operation

    For this reason, some microcontrollers such as low end PICs just have rotate and rotate through carry, and don't bother with arithmetic or logical shift instructions. Rotate through carry is especially useful when performing shifts on numbers larger than the processor's native word size, because if a large number is stored in two registers, the ...

  8. XOP instruction set - Wikipedia

    en.wikipedia.org/wiki/XOP_instruction_set

    The shift instructions here differ from those in SSE2 in that they can shift each unit with a different amount using a vector register interpreted as packed signed integers. The sign indicates the direction of shift or rotate, with positive values causing left shift and negative right shift [ 10 ] Intel has specified a different incompatible ...

  9. List of discontinued x86 instructions - Wikipedia

    en.wikipedia.org/wiki/List_of_discontinued_x86...

    Packed shift, with signed shift-amounts. Shift-amount is provided on a per-vector-lane basis, and is taken from the bottom 8 bits of each lane of the last source argument. The shift-amount is considered signed − a positive value will cause left-shift, while a negative value causes right-shift. 8-bit, signed VPSHAB xmm1,xmm2/m128,xmm3: XOP.9 ...