changes in sbcl-2.4.0 relative to sbcl-2.3.11:
* minor incompatible change: *COMPILE-VERBOSE* and *LOAD-VERBOSE* are bound
to NIL when the system is started with the --script command-line argument.
(reported by Hraban Luyat, thanks to Nicolas Martyanoff)
* minor incompatible change: when looking for its core file, the system
checks the validity of whatever is pointed to by /proc/self/exe, and
assesses argv[0] if /proc/self/exe is invalid. (thanks to Philipp Marek)
* minor incompatible change: the system no longer provides type names on the
standard (CL) symbols ARRAY-RANK, ARRAY-TOTAL-SIZE, PATHNAME-HOST,
PATHNAME-TYPE, PATHNAME-DIRECTORY, FLOAT-RADIX or FLOAT-DIGITS.
(lp#2045559)
* platform support
** the mark-region parallel garbage collector can be enabled on arm64.
(Thanks to Hayley Patton)
** fix build on modern FreeBSDs. (lp#2046996, thanks to David J. Flander)
* bug fix: restore compiler type inference correctness on calls to REDUCE
with :INITIAL-VALUE but no :FROM-END. (lp#2044856, reported by Patrick
Poitras)
* bug fix: compiler error when declaring SB-EXT:MUFFLE-CONDITIONS on an
unknown type. (lp#2045442)
* bug fix: the disassembler provided non-pretty output for registers in some
cases. (lp#2046004, reported by Fedorov Alexander)
* bug fix: the system is slightly less likely to exhaust the stack again
when reporting a control stack exhaustion error.
* optimization: GC write barriers are eliminated in more cases.
* optimization: improved type derivation of iteration variables with mixed
types.
* optimization: remove unused initial values from LET bindings, improving
register type selection.
* optimization: lower EQUALP/EQUAL/EQL to EQL/EQ in FIND/MEMBER based on the
input types.
* optimization: better type derivation for DPB, LOGIOR.