src/lisp/gencgc.c:
o Save and restore the FPU state in alloc().

src/compiler/x86/alloc.lisp
src/compiler/x86/array.lisp
src/compiler/x86/call.lisp
src/compiler/x86/float-sse2.lisp
src/compiler/x86/float.lisp
src/compiler/x86/move.lisp
src/compiler/x86/sap.lisp:
o Don't need to use :save-p anymore because the allocation routine
  saves an live registers anyway.  This improves code generation as
  well.

src/general-info/release-20d.txt:
o Update.

entries with just the file path, removing the revision number, date,
author and state.  The actual information is now computed during
compilation and stored in the fasl itself.  (See ticket:48.)

"cmucl-x86-vm" domain.

boot-2010-02-1 as the bootstrap file.  You should probably also use
the new -P option for build.sh to generate and update the po files
while building.

sse2-packed-2008-11-12).

code.  Rather than introduce a new FreeBSD case to the x86 sigcontext
member accessor routines, collapse all of the system specific routines
down to a common set of routines.

* code/debug-int.lisp - Disable some Darwin-specific code to debug
  NULL mcontext pointers.

* code/float-trap.lisp - Remove ancient FreeBSD-specific code for
  handling floating point signals.

* code/macros.lisp, code/sap.lisp, compiler/saptran.lisp - Include the
  SAP-REF-LONG setter by default on the x86.

* code/x86-vm.lisp - Remove operating system specific sigcontext
  definitions and sigcontext accessors.  Define the alien sigcontext
  as a system area pointer.  Replace the sigcontext accessors with
  foreign function calls that mask the complexity of the underlying
  sigcontext member access.

* compiler/x86/float.lisp - Unconditionally define STORE-LONG-FLOAT.
  This function is used by the %SET-SAP-REF-LONG VOP that underlies
  the SAP-REF-LONG setter.

* compiler/x86/sap.lisp - Unconditionally define %SET-SAP-REF-LONG.
  In the case where there is not a distinct LONG-FLOAT type, admit
  DOUBLE-FLOAT values instead.  The x87 automatically widens values
  pushed onto stack.  This mirrors the behavior of the SAP-REF-LONG
  VOP.

* lisp/Darwin-os.c, lisp/Linux-os.c - Define functions to access
  sigcontext members of interest to Lisp.  Delete the sc_reg function
  and replace its uses with os_sigcontext_reg which is more suitably
  typed.

* lisp/FreeBSD-os.c - Define functions to access sigcontext members of
  interest to Lisp.  We need to be careful about the SSE and non-SSE
  cases for retrieving x87 registers from the saved machine state.
  Define a low-level SIGFPE handler to intercept floating point traps
  and restore the cleared status word bits based on the signal code.
  Get rid of sc_reg for the reasons noted above.

* lisp/Darwin-os.h, lisp/FreeBSD-os.h - Declare the restore_fpu
  function and define a specialized RESTORE_FPU macro.  Remove the
  sc_reg prototype.

* lisp/Linux-os.h - Remove the sc_reg prototype.

* lisp/os.h - Add prototypes for the new os_sigcontext functions.

* lisp/x86-lispregs.h - Redefine SC_REG and SC_PC to expand out to the
  new os_sigcontext functions.  Redfine SC_SP to expand out to SC_REG.
  Eliminate all platform-specific defintions of SC_PC and SC_SP.

load FP registers from the sigcontext.

avoid possible heap corruption due to interruption. Exploit the
with-fixed-allocation macro where appropriate.

node-var as an optional argument so the allocation function can make
policy decisions (to inline with GENCGC).

Remove the make-complex-{single,double}-float functions, and just
define the VOPs as translations of the complex function.

Fix a few bugs in the complex-float move VOPs.

common binaries to be run on both:

* The immediate-stack storage class has been removed, this is
unnecessary as the descriptor-stack SC can be used. It may have once
been part of some GC stragety to reduce the number of stack slots that
needed to be noted for a GC.

* The object allocation has been abstracted and cleaned up. This
should produce slightly faster smaller code with CGC, and can be
compiled to support inline allocation with GENCGC.  CGC compiled code
will run under GENCGC, and GENCGC binaries that don't use inline
allocation will run under CGC.

* A random hash is now placed in the unused symbol object slot (the
symbol-hash slot). This saves flushing the info cache at each GC, and
may have other uses for symbol based hash tables. Should help MP
safety.

* Common set of static symbols used by both CGC and GENCGC.

* Corrections to the stack-ref VOP; now returns lisp objects not
unsigned numbers. Required some patches to debug-int.

* Inline unsigned/signed byte 32 to bignum allocation enabled.

* Support for the x86 xadd instruction applied to instance slot and
symbol values - may be handy for some MP code.

* Bump up the FASL file version from 1 to 2.

being used because the costs were wrong - combined them together into
one VOP. Use LEA when appropriate.

Change the offset used by the sap VOPS from an unsigned-num to a
signed-num. This helps fixes some SAP functions for negative offsets
which are useful on the x86 with its stack growing down. The offset is
currently declared to be a index (unsigned-byte 29) in
compiler/saptran.lisp so this should work without change, but to use
the negative offsets requires complementary changes to saptran (index
-> fixnum).