A String Instruction in 8086 is a series of the same type of data items in sequential memory locations. The CMPS instruction can be used to compare a byte in one string with a byte in another string or to compare a word in one string with a word in another string. SI is used to ho...
While this approach gave the 8086 a flexible instruction set, it created a problem in the long run for the x86 architecture, requiring complicated logic to determine instruction length. One benefit of RISC-based processors such as the Apple M1 is that they have (mostly) constant instruction leng...
This chapter discusses the details of the significant changes in the 80脳86 instruction set and architecture as the 8086 evolved into the 80386. All the new chips were introduced at higher clock speeds and with new instructions. The 186 added a number of new instructions and new forms of ...
The x86 instruction set has evolved over time. Originally, it was based around 16 bits in the 8086, later 32bit support was added. Recently AMD extended the general purpose registers to 64 bits, and Intel have added 128 bit vector (SIMD) registers, and will upgrade them to 256 bits when...
The ModR/M byte preserves the Datapoint 2200's concept of using the same instruction for memory and register operations, but allows a memory address to be provided in the instruction. The 8086 also cleans up some of the historical baggage in the instruction set, freeing up space in the ...
flag) instruction from the original 8086 instruction set is also used by Windows but not Linux. The same holds for BSR (bit scan reverse) from the 80386. They are not exactly common (measured at less than 0.01%), but still interesting to see that they are never used in th...
This chapter discusses the details of the significant changes in the 80×86 instruction set and architecture as the 8086 evolved into the 80386. All the new chips were introduced at higher clock speeds and with new instructions. The 186 added a number of new instructions and new forms of inst...
Computer architectures are divided into two major families:RISC(Reduced Instruction Set Computer), which focuses on having simple, fixed-size instructions that can execute in a clock cycle; andCISC(Complex Instruction Set Computer), which has instructions of different sizes that perform multiple operati...
Appendix H: 8086 Instruction Setbleachingcarbamide peroxidedentinmicrohardnesssalivavital teethPresents a letter to the editor about acronyms published in the April 7, 2004 issue of "British Dental Journal."doi:10.1002/0471733520.app8Rafiquzzaman
The Instruction Set Architecture, or ISA, is defined as that part of the processor architecture related to programming, including the native data types, instructions, registers, addressing modes, memory architecture, interrupt and exception handling, and external IO. With the exception of some small ...