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Un-special-case "xchg rax,rax"; allow it to be encoded as 48 90 for orthogonality's sake. It's a no-op, to be sure, but so are many other instructions. "xchg eax,eax" is still special-cased in 64-bit mode since it is not a no-op; unadorned opcode 90 is now simply "nop" and nothing else. Make the disassembler detect unused REX.W and display them as an "o64" prefix.
NASM, the Netwide Assembler. Many many developers all over the net respect NASM for what it is - a widespread (thus netwide), portable (thus netwide!), very flexible and mature assembler tool with support for many output formats (thus netwide!!). Now we have good news for you: NASM is licensed under LGPL. This means its development is open to even wider society of programmers wishing to improve their lovely assembler. The NASM project is now situated at SourceForge.net, the most popular Open Source development site on the Internet. Visit our website at http://nasm.sourceforge.net/ and our SourceForge project at http://sourceforge.net/projects/nasm/ See the file CHANGES for the description of changes between revisions. With best regards, NASM crew.
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