re PR fortran/37472 (bad output on default-format write of double in common block with -m64)

2008-12-22  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libfortran/37472
	* io/write_float.def (output_float_FMT_G_): Modify calculation of temp
	to avoid sensitivity to round-off.

From-SVN: r142884