* config/vax/tm-vax.h (INVALID_FLOAT): Move macro from here...

* vax-tdep.c (INVALID_FLOAT): To here.  Document why it is broken.

* rs6000-tdep.c (rs6000_do_registers_info): Delete code wrapped in
#ifdef INVALID_FLOAT.
* infcmd.c (do_registers_info): Ditto.
* values.c (unpack_double): Ditto.  Add comment.

* config/ns32k/tm-umax.h (INVALID_FLOAT): Delete macro that was
already commented out.

gdb/vax-tdep.c

@@ -26,6 +26,24 @@
 #include "frame.h"
 #include "value.h"
 
+/* Return 1 if P points to an invalid floating point value.
+   LEN is the length in bytes -- not relevant on the Vax.  */
+
+/* FIXME: cagney/2002-01-19: The macro below was originally defined in
+   tm-vax.h and used in values.c.  Two problems.  Firstly this is a
+   very non-portable and secondly it is wrong.  The VAX should be
+   using floatformat and associated methods to identify and handle
+   invalid floating-point values.  Adding to the poor target's woes
+   there is no floatformat_vax_{f,d} and no TARGET_FLOAT_FORMAT
+   et.al..  */
+
+/* FIXME: cagney/2002-01-19: It turns out that the only thing that
+   uses this macro is the vax disassembler code (so how old is this
+   target?).  This target should instead be using the opcodes
+   disassembler.  That allowing the macro to be eliminated.  */
+
+#define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
+
 /* Vax instructions are never longer than this.  */
 #define MAXLEN 62