[Converted from Gnats 1258]

 Hi,
 
 Attached is a preliminary patch to fix cmp.w.
 
 The following testcase, derived from
 gcc.c-torture/execute/20020307-1.c, fails.
 
 	.h8300h
 	.section .text
 	.align 1
 	.global _main
 _main:
 	sub.l	er0,er0
 	cmp.w	#0x8000,r0
 	bls	.L1
 	jsr	@_abort
 L1:
 	jsr	@_exit
 	.end
 
 This is equivalent to
 
   if ((unsigned short) 0x8000 >= (unsigned short) 0)
     exit ();
   else
     abort ();
 
 Inside the simulator, 0x8000 is somehow sign-extended to 0xffff8000,
 and cmp.w computes the difference like so.
 
   0 - 0xffff8000 = 0x00008000
 
 This result won't set the carry flag, so bls jumps in the wrong way.
 
 I am trying to track down where this strange sign extension occurs,
 but I thought it may be a good idea to share the problem early.  Any
 thought?
 
 Kazu Hirata
 
 2003-06-24  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* compile.c (sim_resume): Mask the upper half of operands when
 	simulating cmp.w.
 
 Index: compile.c
 ===================================================================
 RCS file: /cvs/src/src/sim/h8300/compile.c,v
 retrieving revision 1.31
 diff -u -r1.31 compile.c
 --- compile.c	19 Jun 2003 02:14:14 -0000	1.31
 +++ compile.c	24 Jun 2003 14:29:51 -0000
 @@ -2355,6 +2355,8 @@
  	    goto end;
  	  if (fetch (sd, &code->src, &ea))
  	    goto end;
 +	  rd &= 0xffff;
 +	  ea &= 0xffff;
  	  ea = -ea;
  	  res = rd + ea;
  	  goto just_flags_alu16;

Release:
unknown