x86 is a family of instruction set architectures based on the Intel 8086 microprocessor and its 8088 variant. The 8086 was introduced in 1978 as a fully 16-bit extension of Intel's 8-bit 8080 microprocessor, with memory segmentation as a solution for addressing more memory than can be covered by a plain 16-bit address. x86 assembly tutorials, x86 opcode reference, programming, pastebin with syntax highlighting. x86 Instruction Set Reference SAL/SAR/SHL/SHR Shift. Opcode Mnemonic Description; D0 /4: SAL r/m8: all other IA-32 processors (starting with the Intel 286 processor) do mask the shift count to 5 coder edition of X86 Opcode and Instruction Reference. pf 0F po so o proc st m rl x mnemonic op1 op2 op3 op4 iext tested f modif f def f undef f Central Processing Unit (CPU) instructions set. The general-purpose instructions perform basic data movement, arithmetic, logic, program flow, and string operations which programmers commonly use to write application and system software to run on Intel 64 and IA-32 processors. The Intel 80286 (also marketed as the iAPX 286 and often called Intel 286) is a 16-bit microprocessor that was introduced on February 1, 1982. It was the first 8086 based CPU with separate, non-multiplexed address and data buses and also the first with memory management and wide protection abilities. x86 Instructions. 05/23/2017; 9 minutes to read; Contributors. In this article. In the lists in this section, instructions marked with an asterisk (*) are particularly important. Instructions not so marked are not critical. On the x86 processor, instructions are variable-sized, so disassembling backward is an exercise in pattern matching. The primary difference between ARM and X86 processors is that ARM processors follow a RISC (Reduced Instruction Set Computer) architecture, while x86 processors are CISC (Complex Instruction set Architecture). The following table provides a list of x86-Assembler mnemonics, that is not complete. ARPL dest,s