changes in sbcl-2.1.5 relative to sbcl-2.1.4:
* minor incompatible change: on x86-64, the backend instruction encoders for
movzx and for string opcodes have changed their semantics.
* platform support:
** compatibility: support the latest MinGW on x86. (lp#1923325, thanks to
Alexis Rivera)
** bug fix: on x86-64, fix instruction encoding for TEST on RIP-relative
addresses. (lp#1925808, reported by Shinmera on #sbcl, thanks also to
3b)
** bug fix: on x86-64, loading all-1s into an AVX2 register no longer
causes an error. (thanks to Marco Heisig)
** bug fix: on arm64, improve disassembly of ADD with constant 0 as MOV
** enhancement: on arm64, support debugger commands RETURN-FROM-FRAME and
RESTART-FRAME more efficiently.
** enhancement: on x86-64, add support for vshuf* AVX2 instructions.
(reported by Bela Pecsek)
** optimization: faster function calls on arm64.
** optimization: (SETF SBIT) is faster on x86-64.
* bug fix: INTEGER-DECODE-FLOAT was computing the wrong answer for denormal
double floats. (lp#1926383, reported by Stavros Macrakis)
* bug fix: RANDOM on a floating point argument now does not cons. (reported
by Tito Latini)
* bug fix: fix a compiler crash in type derivation of LOGTEST. (lp#1928243)
* bug fix: fix a compiler failure when a declared function type contains a
literal structure with a valid MAKE-LOAD-FORM method. (lp#1929160, thanks
to Yurii Hryhorenko)
* optimization: FBOUNDP on a constant symbol is now faster.
* optimization: file compilation now produces smaller fasls for files which
reference package literals.
* optimization: derive the type of calls to FLOAT-SIGN.