现代计算机在冯诺伊曼模型的基础理念上,设计了不同的指令集架构ISA,这些指令集架构ISA中规定了计算机的各个部件(内存、执行单元、控制单元等)的具体实现规范(包括地址空间、寻址能力、寄存器个数和用途)和执行的工作(指令)。 所以说,指令集架构ISA就是在冯诺伊曼模型的基础上制定的各种计算机设计规范。 接下来我们就会...
E.g, x86 ISA: 多媒体拓展 (MMX), 后面又有支持SIMD的SSE和AVX指令集拓展。 E.g, VAX ISA: 一个切换程序上下文的指令 指令支持的操作数类型,也是有差别。其中仍然是软件和硬件复杂度之间的取舍问题。 比如:RISC architectures vs. Intel 432 早期的RISC只支持整数操作,如果有浮点数的需要需自行去用整形操作...
An in-depth look at how to disassemble the x86 instruction set, and how to put it to good use in your own code injections Introduction When starting out as a reverse engineer or malware analyst, it is often tempting to trust your disassembler to correctly resolve the various bytes into code...
x86InstructionSet Architecture Comprehensive32/64-bitCoverage FirstEdition AlsobyTomShanley HEAVEN’SFAVORITE —ANovelofGenghisKhan— Book1,ASCENT:THERISEOFCHINGGISKHAN Book2,DOMINION:DAWNOFTHEMONGOLEMPIRE MINDSHARETECHNICALTRAINING Pleasevisit.mindshareforacompletedescriptionofMind- ...
x86-64 CISC instructions are not executed by the hardware, but compiled into microcode; then, the CPU executes the microcode.1 RISC architecture, true to the name, limits the number of instructions. RISC is a load-store architecture. RISC ISA includes two instructions, one to fetch data into...
The group of machine language instructions that a computer can follow, which may range from a handful to several hundred. It is a fundamental architectural component of a CPU and is either built into the CPU or into microcode, a layer between the instruction set and the circuitry. The instruc...
The x86mf instruction instructs processor 104 to move a value in a specified x86 integer register to a specified 64 bit integer register. Processor 104 then performs operations using the value in the 64 bit integer register. When processor 104 decodes and executes move to instruction 214, proce...
微机原理-07InstructionSet 指令集:计算机的语言 1 2004-10-14Liping ZHANG, Tsinghua University
For example, the IBM Stretch [stretch], developed in the late 1950s, had an ISA with 32-bit and 64-bit instructions, where some of the 32-bit instructions were compressed versions of the full 64-bit instructions. Stretch also employed the concept of limiting the set of registers that ...
Nowadays, X86 CPU all have superscalar computing ability. Superscalar architecture can fetch, execute and commit more than one instruction per cycle. And it helps a lot to explore more instruction level parallelism. If a superscalar processor fetches instructions inefficiently, its performance speedup ...