0.9.8.16:

0.9.8.16:
        Merge sbcl-devel "Some assembler improvements for x86-64" by
        Lutz Euler on 2006-01-05.

        Quote from the email:

          1. a reduction in core size of 190 KB due to shorter encodings
             for common forms of the MOV instruction, and
          2. for robustness, better checking of dword-sized immediate
             arguments in the assembler with respect to their implicit
             sign-extension.