(try 2) [4.3] making a few real functions work with dfp

["Manuel LÃpez-IbÃÃez" <lopezibanez at gmail dot com>]

It seems you didn't like my patch. No problem, I have another. :-)

So again, this patch makes exact_real_truncate() and real_isinteger() handle dfp
values correctly.

In order to do so, it compares decimal floating point for equality in
value instead of bitwise identity. No normalisation is performed in
this patch. Still, I am not sure this is more correct that
normalising, since here NaN, infinite and signed zeroes are not
handled in the same way as with real_identical. But I have run out of
ideas, and without this I cannot implement support for dfp in the new
Wconversion option.

Bootstrapped and tested with --enable-languages=all
--enable-decimal-float for trunk revision 119259 on i686-pc-linux-gnu


2006-11-30   Manuel Lopez-Ibanez <manu@gcc.gnu.org>

  * real.c  (exact_real_truncate): Use REAL_VALUES_EQUAL to compare
decimal floating point values instead of real_identical since dfp
values are not normalised by design.
  (real_isinteger): Likewise.

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