re PR middle-end/28473 (with -O, casting result of round(x) to uint64_t produces wrong values for x > INT_MAX)


	PR middle-end/28473
	* convert.c (convert_to_integer): When transforming (T)foo(x) into
	bar(x) check that bar's result type can represent all the values of T.

	* gcc.dg/fold-convround-1.c: New test case.

From-SVN: r115742