The original registers such as EAX, EBX expansion from 32 to 64. The new 8 new registers to provide support for SSE2 SSE unit. Increase in the number of registers will bring performance improvements. At the same time, in order to support both 32 and 64-bit code and register, x86-64 architecture allows the processor to work in the following two modes: Long Mode (long mode) and Legacy Mode (mode of inheritance), Long mode is divided into two sub mode (64bit mode and Compatibility mode compatibility mode). The standard has been the introduction of the AMD server processor Opteron processor. |
This year also launched support for 64-bit EM64T technology, and then not been officially ordered EM64T before IA32E the Intel EM64T name, used to distinguish the X86 instruction set. Similar to Intel's EM64T support 64-bit sub-mode, and AMD's X86-64 technology, the use of 64-bit linear plane addressing, adding eight new general-purpose registers (GPRs), also an increase of 8 registers to support SSE instructions. Similar, with AMD and Intel 64-bit technology will be compatible the IA32 and IA32E, only when running under 64-bit operating system only will be used IA32E.
First understand explain the super-pipelined superscalar pipeline (pipeline). The pipeline is the Intel 486 chip for the first time start using. The pipeline work like industrial production on the assembly line. An instruction processing pipeline from 5-6 different functions of circuit unit in the CPU, an X86 instruction into steps 5-6, then perform these circuit elements, so that can be achieved in a CPU clock cycles to complete an instruction , and therefore improve the computing speed of the CPU. Classic Pentium divided into four water each integer pipeline, instruction prefetch, decode, execute, and write back the result, the floating-point water is divided into eight water.
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