Round to Integral
Rounds a decimal floating-point value to an integer, suppressing any Inexact exception from being raised.
_Decimal64 __d64_integral_no_inexact (_Decimal64);
_Decimal128 __d128_integral_no_inexact (_Decimal128);
The integer is returned in decimal floating-point format, rounded using the current rounding mode. Digits after the decimal point are discarded.