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Draft NEWS for sbcl-2.6.3

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Christophe Rhodes 2026-03-28 11:31:39 +00:00
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NEWS
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;;;; -*- coding: utf-8; fill-column: 78 -*-
changes relative to sbcl-2.6.2:
* minor incompatible change: (MAKE-ARRAY X :ELEMENT-TYPE 'UNDEFINED) now
signals an error, consistent with (UPGRADED-ARRAY-ELEMENT-TYPE
'UNDEFINED).
* platform support:
** fix disassembler on ppc for the MFLR and ISEL instructions
** the Lisp Return Address object (as part of the Lisp calling convention)
is no longer needed or supported on PPC, SPARC, MIPS or ARM. (This
also frees up a widetag slot previously held by return-pc-widetag)
** remove sensitivity to SBCL init files when building embedcore-sbcl.
(thanks to Robert Brown)
** add support for the ADCX and ADOX instructions on x86-64. (thanks to
Robert Smith)
** on PPC64, indicate the number of return values through flags.
** fix FFI involving int128 arguments on x86-64. (thanks to Andreas
Franke)
** fix build on OpenIndiana/x86-64. (thanks to Andreas Wacknitz)
** fix build on Haiku/x86-64.
** backtraces for THROW on x86 are more likely to be useful.
* bug fix: improved stability of (particularly) the mark-region garbage
collector. (lp#2142711)
* bug fix: compiler type error in complicated expression involving BOOLE and
conditionals. (lp#2142949)
* bug fix: dotted lists involving symbols whose names begins with "DEF" are
not definitions. (lp#2143114, reported by Glenn Thompson)
* bug fix: STABLE-SORT miscompiled on declared union types involving both
LIST and VECTOR. (lp#2143163, reported by akater, thanks to Vasily
Postnicov)
* bug fix: more consistent results between compiler and interpreter in
numerical computations involving negative zeros. (lp#2143383)
* bug fix: USE-PACKAGE once again signals the correct error if an attempt is
made to use the KEYWORD package.
* bug fix: EQUALP on hash tables is no longer sensitive to irrelevant
aspects of the hash table.
* bug fix: SB-INTROSPECT:DEFTYPE-LAMBDA-LIST is more robust against types
defined in low debug situations.
* bug fix: ENSURE-GENERIC-FUNCTION ensures that the allocation of a generic
function does not happen in an arena. (Thanks to Andreas Franke)
* optimization: actually return early when we hit the cache for a
:MAKUNBOUND slot access. (thanks to John Mallery)
* optimization: streams opened with WITH-OPEN-FILE avoid having finalizers.
* optimization: improvement of COUNT on non-simple bit-vectors, or simple
ones with :START/:END arguments. (lp#2142062, thanks to Andrew Berkley)
* optimization: SIMD routines for checking strings for ASCII-only content
are more compact.
* optimization: the reader prefers base-string symbol-names of uninterned
symbols if possible.
* optimization: REMOVE-DUPLICATES uses hash-tables in more situations.
* optimization: UPGRADED-ARRAY-ELEMENT-TYPE is now faster.
changes in sbcl-2.6.2 relative to sbcl-2.6.1:
* minor incompatible change: IMAGPART of a negative float returns 0.0, not