[movitz-cvs] CVS ia-x86

[ffjeld]

Update of /project/movitz/cvsroot/ia-x86
In directory clnet:/tmp/cvs-serv9316

Modified Files:
	codec.lisp 
Log Message:
Have sign-extend-complex deal correctly with bytes of size 0.


--- /project/movitz/cvsroot/ia-x86/codec.lisp	2005/08/13 20:24:04	1.7
+++ /project/movitz/cvsroot/ia-x86/codec.lisp	2007/02/26 22:14:00	1.8
@@ -9,7 +9,7 @@
 ;;;; Created at:    Thu May  4 15:16:45 2000
 ;;;; Distribution:  See the accompanying file COPYING.
 ;;;;                
-;;;; $Id: codec.lisp,v 1.7 2005/08/13 20:24:04 ffjeld Exp $
+;;;; $Id: codec.lisp,v 1.8 2007/02/26 22:14:00 ffjeld Exp $
 ;;;;                
 ;;;;------------------------------------------------------------------
 
@@ -672,10 +672,13 @@
 that byte (i.e. #c(255 1) => -1)."
   (let ((old-byte (realpart cdatum))
 	(numo (imagpart cdatum)))
-    (if (zerop (ldb (byte 1 (1- (* 8 numo))) old-byte))
-	cdatum
-      (complex (- old-byte (dpb 1 (byte 1 (* 8 numo)) 0))
-	       numo))))
+    (cond
+      ((= 0 numo)
+       0)
+      ((zerop (ldb (byte 1 (1- (* 8 numo))) old-byte))
+       cdatum)
+      (t (complex (- old-byte (dpb 1 (byte 1 (* 8 numo)) 0))
+                  numo)))))
 
 (defun sign-extend (old-byte numo)
   "Given a two's complement signed byte (where the most significant