sbcl-2.6.7 released

Dear all,

SBCL 2.6.7 is now available from the usual places; particularly
noteworthy changes in this release are summarized below.  In particular
the generation and formatting of the user manual has been substantially
reworked; if this is particularly useful (or problematic) to you, we
would like to hear details!

Share and enjoy,

Christophe

changes in sbcl-2.6.7 relative to sbcl-2.6.6:
  * new contrib module: SB-MANUAL contains the SBCL manual in docstrings of
    section definitions, which tie together the docstrings of normal Lisp
    definitions. The manual can thus be explored interactively in the usual
    way (e.g. with Slime's M-.), and it is browsable with the MGL-PAX library
    (out of tree). Also, https://fixnum.com/ (similarly unrelated to the SBCL
    project) provides alternative renderings of the SBCL manual as heavily
    linked PDF and HTML documents as well as Markdown and plain text.
  * new feature: DOCUMENTATION supports DOC-TYPE DECLARATION.
  * platform support:
    ** the SB-SIMD contrib now supports ARM64.  (Thanks to Sylvia Harrington)
    ** AVX512 instructions are now supported on X86-64.  (Thanks to Robert
       Smith and Arthur Miller)
    ** additional support for SIMD instructions on ARM64 and X86-64.  (Thanks
       to Arthur Miller)
    ** fix miscompilation of SAP-REF-N on ARM64.  (Thanks to Hayley Patton)
    ** implement INTEGER-LENGTH on primitive types without a loop on MIPS and
       LoongArch.
  * bug fix: READing with *READ-SUPPRESS* T no longer emits warnings like
    "<internal-feature> no longer present on *FEATURES*".
  * bug fix: compiler type-error when compiling calls to CONCATENATE with
    conditional known non-sequence arguments.  (lp#2160747)
  * bug fix: (EQL <complex>) types were not being treated as numeric by the
    type system.  (lp#2160429)
  * bug fix: improve the handling of quiet (non-signalling) NaN inputs to LOG.
    (lp#2160268, reported by Woodrow Kiang)
  * bug fix: miscompilation of MULTIPLE-VALUE-CALL.  (lp#2160207, reported by
    Vasily Postnicov)
  * optimization: passing constant complex numbers to local functions can be
    done without consing.
  * optimization: where available, use enhanced SIMD routines for UTF-8
    conversions.
  * optimization: compiler transforms of COUNT are applicable with a wider
    variety of keyword arguments.
  * optimization: remove at least one redundant instruction from SB-ALIEN:DEREF.
  * optimization: the sparse set implementation in the compiler has been tuned
    to improve performance on real-world workloads.
  * documentation: many typos and typesetting issues were fixed.
  * documentation: SB-MANUAL:@FOREIGN-FUNCTION-INTERFACE now correctly states
    that arrays are row-major (not column-major).  (lp#2158033, thanks to Scott
    L. Burson)
  * documentation: internally, docstrings now conform to a subset of Markdown,
    but DOCUMENTATION (and thus DESCRIBE) strips some of this markup. The
    official manual is still generated from Texinfo, but the Texinfo files are
    generated from SB-MANUAL.
  * documentation: the manual now has a separate index for declarations.