patch for cgen generated decoders

[matthew green <mrg at cygnus dot com>]

hi folks.


i need this patch for an architecture where the standard instruction
bitsize is 16 bits, yet there exists a 48-bit instruction (which
causes CGEN_INT_INSN_P to be false).  the problem i was seeing is
that for the 32-bit instruction my ifields were not being extracted
correctly, because only 16 bits were present in the "insn_value".
the patch below enables the code previously only available for the
CGEN_INT_INSN_P==1 case, but ensures that 32-bit instructions are
passed in their entirity in all cases.

(actually, this code uses "unsigned long" to hold this value, where
it should probably use a "CGEN_INSN_INT".  i'm not sure exactly if
it will work correctly on a LP64 host...)


i've tested this change with the fr30 & m32r ports and it does not
affect their operation (fr30 is the only other port that sets
CGEN_INT_INSN_P to be false).


2000-11-05  matthew green  <mrg@redhat.com>

	* cgen-dis.in (print_insn): Load a full CGEN_INSN_INT in the
	!CGEN_INT_INSN_P case as well.

Index: cgen-dis.in
===================================================================
RCS file: /cvs/src/src/opcodes/cgen-dis.in,v
retrieving revision 1.2
diff -p -r1.2 cgen-dis.in
*** cgen-dis.in	2000/08/28 18:36:53	1.2
--- cgen-dis.in	2000/11/05 02:28:01
*************** print_insn (cd, pc, info, buf, buflen)
*** 281,289 ****
  	     machine insn and extracts the fields.  The second pass prints
  	     them.  */
  
! #if CGEN_INT_INSN_P
! 	  /* Make sure the entire insn is loaded into insn_value.  */
! 	  if (CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize)
  	    {
  	      unsigned long full_insn_value;
  	      int rc = read_insn (cd, pc, info, buf,
--- 281,290 ----
  	     machine insn and extracts the fields.  The second pass prints
  	     them.  */
  
! 	  /* Make sure the entire insn is loaded into insn_value, if it
! 	     can fit.  */
! 	  if (CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize &&
! 	      (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
  	    {
  	      unsigned long full_insn_value;
  	      int rc = read_insn (cd, pc, info, buf,
*************** print_insn (cd, pc, info, buf, buflen)
*** 295,304 ****
  		(cd, insn, &ex_info, full_insn_value, &fields, pc);
  	    }
  	  else
! #endif
  
- 	  length = CGEN_EXTRACT_FN (cd, insn)
- 	    (cd, insn, &ex_info, insn_value, &fields, pc);
  	  /* length < 0 -> error */
  	  if (length < 0)
  	    return length;
--- 296,304 ----
  		(cd, insn, &ex_info, full_insn_value, &fields, pc);
  	    }
  	  else
! 	    length = CGEN_EXTRACT_FN (cd, insn)
! 	      (cd, insn, &ex_info, insn_value, &fields, pc);
  
  	  /* length < 0 -> error */
  	  if (length < 0)
  	    return length;