changes in sbcl-2.5.9 relative to sbcl-2.5.8:
* minor incompatible change: remove (SETF SB-EXT:POSIX-GETENV), which only
ever existed as an operator in SBCL on Windows.
* minor incompatible change: (LOG -0.0) now returns
SINGLE-FLOAT-NEGATIVE-INFINITY, more consistently with IEEE 754.
* minor incompatible change: (EXPT 0.0 0.0) now returns 1.0, rather than
signalling an error.
* platform support
** restore functionality on NetBSD. (thanks to Masatoshi SANO)
** fix building SBCL as a shared library on ARM64. (lp#2122059, reported
by Guillaume LE VAILLANT)
* optimization: TYPEP with array types does less work in many cases.
* optimization: COMPLEMENT on a known function can be transformed away in
more cases.
* optimization: calls to local functions with &REST arguments can be
optimized in more cases.
* optimization: bound checks can be eliminated in ROW-MAJOR-AREF based on
constraints relating the index to the available array elements.
(lp#2121253, thanks to Vasily Postnicov)
* optimization: function type declarations no longer inhibit inlining local
functions. (lp#2121351, reported by kbhit)
* optimization: bulk movement of memory in the system is implemented with
less overhead around memmove().
* optimization: MAKE-ARRAY with dimensions coming from ARRAY-DIMENSIONS on
an array with known dimensions avoids consing an intermediate dimensions
list.
* optimization: a number of arithmetic operators and relations in
combination with some constant arguments do partial expression
simplification at compile-time. (lp#2122063 for %NEGATE thanks to Vasily
Postnicov)