Use GMP_RNDN for portability to MPFR 2.4.2

	* gimple-ssa-sprintf.c (format_floating_max): Use GMP_RNDN instead
	of MPFR_RNDN.
	(format_floating): Likewise.

From-SVN: r240350

gcc/ChangeLog

+2016-09-22  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* gimple-ssa-sprintf.c (format_floating_max): Use GMP_RNDN instead
+	of MPFR_RNDN.
+	(format_floating): Likewise.
+
 2016-09-22  Jakub Jelinek  <jakub@redhat.com>
 
 	PR fortran/77665

gcc/gimple-ssa-sprintf.c

@@ -1125,7 +1125,7 @@ format_floating_max (tree type, char spec)
      round-to-nearest mode.  */
   mpfr_t x;
   mpfr_init2 (x, rfmt->p);
-  mpfr_from_real (x, &rv, MPFR_RNDN);
+  mpfr_from_real (x, &rv, GMP_RNDN);
 
   const char fmt[] = { '%', 'R', spec, '\0' };
   int n = mpfr_snprintf (NULL, 0, fmt, x);
@@ -1325,7 +1325,7 @@ format_floating (const conversion_spec &spec, tree arg)
 	 round-to-nearest mode.  */
       mpfr_t mpfrval;
       mpfr_init2 (mpfrval, rfmt->p);
-      mpfr_from_real (mpfrval, rvp, MPFR_RNDN);
+      mpfr_from_real (mpfrval, rvp, GMP_RNDN);
 
       char fmtstr [40];
       char *pfmt = fmtstr;