PR fortran/96711 - ICE with NINT() for integer(16) result

When rounding a real to the nearest integer, temporarily convert the real
argument to a longer real kind when the result is of type/kind integer(16).

gcc/fortran/ChangeLog:

	* trans-intrinsic.c (build_round_expr): Use temporary with
	appropriate kind for conversion before rounding to nearest
	integer when the result precision is 128 bits.

gcc/testsuite/ChangeLog:

	* gfortran.dg/pr96711.f90: New test.

1 files changed, 15 insertions, 2 deletions

diff --git a/gcc/fortran/trans-intrinsic.c b/gcc/fortran/trans-intrinsic.c
index 2483f016d8e..32fe9886c57 100644
--- a/gcc/fortran/trans-intrinsic.c
+++ b/gcc/fortran/trans-intrinsic.c
@@ -395,11 +395,24 @@ build_round_expr (tree arg, tree restype)
     fn = builtin_decl_for_precision (BUILT_IN_LROUND, argprec);
   else if (resprec <= LONG_LONG_TYPE_SIZE)
     fn = builtin_decl_for_precision (BUILT_IN_LLROUND, argprec);
+  else if (resprec >= argprec && resprec == 128)
+    {
+      /* Search for a real kind suitable as temporary for conversion.  */
+      int kind = -1;
+      for (int i = 0; kind < 0 && gfc_real_kinds[i].kind != 0; i++)
+	if (gfc_real_kinds[i].mode_precision >= resprec)
+	  kind = gfc_real_kinds[i].kind;
+      if (kind < 0)
+	gfc_internal_error ("Could not find real kind with at least %d bits",
+			    resprec);
+      arg = fold_convert (gfc_float128_type_node, arg);
+      fn = gfc_builtin_decl_for_float_kind (BUILT_IN_ROUND, kind);
+    }
   else
     gcc_unreachable ();
 
-  return fold_convert (restype, build_call_expr_loc (input_location,
-						 fn, 1, arg));
+  return convert (restype, build_call_expr_loc (input_location,
+						fn, 1, arg));
 }