changes in sbcl-2.4.8 relative to sbcl-2.4.7:
* bug fix: the elftool utility finds a writeable directory in more
situations. (thanks to Shinmera)
* bug fix: SLOT-MAKUNBOUND does not attempt to dereference a PROGN variable
in the interpreter.
* bug fix: READ-SEQUENCE into displaced arrays with a non-zero offset now
writes to the right memory location.
* bug fix: fix some erroneous file position calculations in the editcore
utility (exposed by a change in the libzstd compression implementation).
* bug fix: do not break the build on STYLE-WARNINGs for earlier SBCL build
hosts. (lp#2064671, reported by Patrick Poitras)
* bug fix: various bug fixes for ppc64le (lp#2074275, reported by Claude R. C.)
* bug fix: address a rounding error in the TAN type deriver which led to a
miscompile in cl-pdf. (lp#2077100, reported by Gian Pierro Carrubba)
* bug fix: overoptimization of FIND with a :TEST of CHAR-EQUAL. (lp#2077539)
* optimization: detection of duplicate names in loaded code now scales
subquadratically.
* optimization: switch from Floyd's to Brent's cycle detection for lists.
* optimization: EQUAL on lists should be faster.
* optimization: fewer filesystem operations are performed when working out
what to LOAD.
* optimization: various microoptimizations on hash tables and
associated operations.
* optimization: strings are now hashed using FNV-1A, replacing Bob Jenkins'
one-at-a-time hash.
* optimization: fewer redundant validations of the sequence bounding indices
in POSITION on strings.
* optimization: many improvements to type derivation on the arguments to and
results of standard functions
* optimization: adding many (hundreds) methods to a generic function can be
done faster.