PATCH: Fix sign-extension of bignums

[Mark Mitchell]

Here's a patch for another problem with bignums.

On this input:

	.8byte	-3378511873

which is a value that fits in 32 bits when treated as unsigned, and
therefore makes it to emit_expr as an O_constant, we failed to
sign-extend the value on output.  It looks like we were trying to do
that, but the test "exp->X_add_number < 0" makes no sense; that value
should always be tested with "> 0" or "<= 0", and, furthermore, the "<
0" case would be for floating-point nubmers, which is not this case.

OK?

--
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com

2004-08-10  Mark Mitchell  <mark@codesourcery.com>

	* read.c (emit_expr): Sign-extend bignums.

Index: read.c
===================================================================
RCS file: /cvs/src/src/gas/read.c,v
retrieving revision 1.78
diff -c -5 -p -r1.78 read.c
*** read.c	19 Apr 2004 09:32:55 -0000	1.78
--- read.c	11 Aug 2004 02:24:11 -0000
*************** emit_expr (expressionS *exp, unsigned in
*** 3486,3496 ****
    if (op == O_constant && nbytes > sizeof (valueT))
      {
        valueT val;
        int gencnt;
  
!       if (!exp->X_unsigned && exp->X_add_number < 0)
  	extra_digit = (valueT) -1;
        val = (valueT) exp->X_add_number;
        gencnt = 0;
        do
  	{
--- 3486,3496 ----
    if (op == O_constant && nbytes > sizeof (valueT))
      {
        valueT val;
        int gencnt;
  
!       if (!exp->X_unsigned && exp->X_add_number > 0)
  	extra_digit = (valueT) -1;
        val = (valueT) exp->X_add_number;
        gencnt = 0;
        do
  	{