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.

Douglas Crosher.

   {{{:EXTERNAL-FORMAT}}}.  Lists are needed to specify a composing
   external format like {{{:DOS}}} or {{{:MAC}}}.

prevents the exception from being resignaled immediately.

src/code/float-trap.lisp:
o Clear current and accrued exception bits that match any new enabled
  exceptions specified by :traps.

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

feature.

 * src/compiler/x86/arith.lisp
   * Add vop for logcount that uses popcnt instruction.
 * src/compiler/x86/insts.lisp
   * Define popcnt instruction (but only for :sse3)
 * src/general-info/release-20d.txt:
   * Update.

 * src/pcl/simple-streams/external-formats/iso8859-2.lisp:
   * Fix typo.

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

trac.common-lisp.net/cmucl.

number of octets for surrogate pairs.  Two was returned instead of
four.

 * src/pcl/simple-streams/external-formats/utf-16-be.lisp:
 * src/pcl/simple-streams/external-formats/utf-16-le.lisp:
   * Return correct number of octets
 * src/general-info/release-20d.txt
   * Update.

is a bit of a hack.

 * src/code/stream.lisp:
  * Check the state to see if a BOM was read.  This critically depends
    on knowing the format of the state variable for utf16 and utf32
    formats, but the stream code shouldn't have to know the state
    internals. 

 * src/general-info/release-20d.txt
   * Update.

Douglas Crosher.

* src/pcl/simple-streams/external-formats/aliases
  * Add additional aliases.
* src/general-info/release-20d.txt:
  * Update

 utf-32.lisp::
 * Fix typo.

 release-20d.txt::
 * Update.

  src/code/unidata.lisp:: Update Unicode version.

  src/tools/build-unidata.lisp:: Update Unicode version and update for
  change of format of NameAliases.txt.

  src/i18n/unidata.bin:: Updated with new data.

  src/general-info/release-20d.txt:: Updated.

  src/i18n/BidiMirroring.txt:: Updated to Unicode 6.1.0.
  src/i18n/CaseFolding.txt:: Updated to Unicode 6.1.0.
  src/i18n/CompositionExclusions.txt:: Updated to Unicode 6.1.0.
  src/i18n/DerivedNormalizationProps.txt:: Updated to Unicode 6.1.0.
  src/i18n/NameAliases.txt:: Updated to Unicode 6.1.0.
  src/i18n/NormalizationCorrections.txt:;
  src/i18n/SpecialCasing.txt:: Updated to Unicode 6.1.0.
  src/i18n/UnicodeData.txt:: Updated to Unicode 6.1.0.
  src/i18n/WordBreakProperty.txt:: Updated to Unicode 6.1.0.
  src/i18n/tests/NormalizationTest.txt:: Updated to Unicode 6.1.0.
  src/i18n/tests/WordBreakTest.txt:: Updated to Unicode 6.1.0.

Other changes section, with a few clarifications.