We can safely assume n-fixnum-tag-bits = 1. Revision a369686d which gave 1 more
bit of precision theorized that a build-time choice could be made within a
particular backend. While that was true for a while after the commit, x86-64
is now so ingrained with the belief that fixnums are 63 bits that it can't
reasonably be changed. While we should prefer the symbolic constant in lieu
of a literal 1, that style does not imply that littering up the source with
illegible "#+#.(cl:if)" around vops that can't be enabled is sound practice.
GENERAL INFORMATION
Welcome to SBCL.
If you'd like to install or build the system, see the "INSTALL" file.
To find out more about who created the system, see the "CREDITS" file.
If you'd like information about the legalities of copying the system,
see the "COPYING" file.
The "DOCUMENTATION" file describes the various formats and ways to
access the documentation.
The system is a work in progress. See the "TODO" file in the source
distribution for some highlights.
See the "BUGS" file for how to view or report bugs.
If you'd like to make suggestions or help to improve the system,
please send mail to one of the mailing lists:
sbcl-help@lists.sourceforge.net
sbcl-devel@lists.sourceforge.net
Note that as a spam reduction measure you must subscribe to the lists
before you can post: https://sourceforge.net/p/sbcl/mailman/
The "HACKING" file has more details regarding hacking on and
contributing to SBCL.
SYSTEM-SPECIFIC HINTS
for OpenBSD 6.0 and newer:
SBCL must be built and run from a filesystem with the "wxallowed"
mount option, such as /usr/local in the default install.
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