[cmucl-announce] 20b patch 000 available

[Raymond Toy]

Well, that didn't last long.  I've discovered a bug in REALPART and
IMAGPART for x86/sse2 builds.  Here is an example of the bug:

    (defun zot-r (z)
      (declare (type (simple-array (complex double-float) (*)) z))
      (realpart (aref z 0)))

    (compile 'zot-r)

    (let ((z (make-array 1 :element-type '(complex double-float)
                 :initial-element #c(42d0 -42d0))))
      (zot-r z))

This returns 0d0 instead of 42d0.  If you replace realpart with
imagpart, you also get 0d0 instead of -42d0.

This has been fixed in 2010-11 snapshot.  For 20b, you can find a patch
for this at
<http://common-lisp.net/project/cmucl/downloads/release/20b/patches/cmucl-20b-patch-000.tar.gz>

As usual, download this patch, untar it somewhere.  Load
cmucl-20b-patch-000.asd, and (asdf:oos 'asdf:load-op
:cmucl-20b-patch-000).  (Alternatively, you can untar it somewhere where
asdf can find the patch-000.asd file.)

Sorry for the trouble,

Ray