This reference should be precise instruction set reference (including x86-64). Its principal aim is exact definition of instruction parameters and attributes.

In contrast to other references, primary source of this reference is a XML document, which guaratees clear and structured information base and therefore ability to extract many various informations such as a list of instructions from requested groups, etc.

The reference is primarily based on Intel manuals as Intel is the originator of x86 architecture. Additionally, it describes undocumented instructions as well. On appropriate places, it gives a notice if an opcode act differently on AMD architecture. Support for Cyrix, NexGen etc. specific instructions is not sheduled at all. As for Itanium-specific instructions, they are added just for the sake of interest - they give a notice that the appropriate opcodes are already used.

x86-32:

http://ref.x86asm.net/geek32.html

x86-64:

http://ref.x86asm.net/geek64.html

Hoempage:

http://ref.x86asm.net/index.html

Ted.

thank you

Here you can download the official Intel Developer Manuals regarding he x86 and x86-64 architecture:

http://www.intel.com/products/processor/manuals/

thanks will find this useful

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Here's another very nice x86/x64 Instruction Set Reference:

http://siyobik.info/main/reference