2013-03-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* trans-expr.c (build_memcmp_call):  New function.
	(gfc_build_compare_string):  If the strings
	compared have constant and equal lengths and
	the strings are kind=1, or, for kind=4 strings,
	the test is for (in)equality, use memcmp().

2013-03-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* gfortran.dg/character_comparison_3.f90:  Adjust for use of memcmp
	for constant and equal string lengths.
	* gfortran.dg/character_comparison_5.f90:  Likewise.
	* gfortran.dg/character_comparison_9.f90:  New test.

From-SVN: r197261