I am pleased to announce the availability of Stalin 0.9.  Stalin is an
aggressively optimizing whole-program compiler for Scheme that does
polyvariant interprocedural flow analysis, flow-directed interprocedural
escape analysis, flow-directed lightweight CPS conversion, flow-directed
lightweight closure conversion, flow-directed interprocedural lifetime
analysis, automatic in-lining, unboxing, and flow-directed program-specific and
program-point-specific low-level representation selection and code generation.
Major improvements of this release include:

  self hosting: Stalin now compiles itself.  The distributed code is self-
    compiled.  Scheme->C is no longer used or needed to build Stalin.

  architectural parameterization: Stalin is now parameterized to allow you to
    specify the sizes and alignments independently for different machine data
    types.  This makes it easier to port Stalin to different C compilers and
    architectures.

  polyvariance: Stalin will automatically make multiple copies of procedures
    to specialize them for different argument types and to facilitate
    in-lining.  Heuristics and users controls prevent unwieldy code growth.

  garbage collection: Stalin now includes the Boehm conservative garbage
    collector.  Stalin automatically estimates the lifetime of data allocated
    at each allocation point and decides, at compile time, whether to allocate
    that data on the stack, on a region (which is managed like a stack and can
    be reclaimed without garbage collection), or on the garbage collected heap.

  APPLY, MAP, and FOR-EACH: Stalin now fully implements APPLY, MAP, and
    FOR-EACH with procedures and call sites of arbitrary arity.

  FPI for Xlib and OpenGL: Stalin now comes with a foreign-procedure interface
    for Xlib and OpenGL.

  QobiScheme: Stalin now comes with a version of QobiScheme, an extensive
    library of Scheme code that includes FORMAT, conditionalization primitives,
    structures, Common-Lisp-like sequence procedures, random-number
    generators, the gamma distribution, numerical integration,
    nondeterministic and constraint-based programming constructs,
    memoization, a string processing package, a context-free grammar parsing
    package, extended I/O, pathname parsing procedures, tries, a linear algebra
    package, the simplex algorithm, the Jacobi algorithm, convex hull, an
    image processing package, JPEG and MPEG compression and decompression,
    multivariate nonlinear optimization, the EM algorithm, timing procedures,
    and a CLIM-like package for building window-based applications.

  improved compiler: Stalin has been largely rewritten.  It is smaller, faster,
    more robust, and produces smaller and faster code.

  GPL: Stalin is now released under the GNU Public License, version 2.

Stalin 0.9 runs on a variety of Unix and Linux platforms including Sun SPARCs,
SGI MIPS, DEC Alphas, and Intel IA-32.  It is available by anonymous FTP from
ftp://ftp.nj.nec.com/pub/qobi/stalin.tar.Z.
