IEEE-754 has: nextUp(x) is quiet except for signaling NaNs. I do not see similar words in our CFP documents. --- Fred J. Tydeman Tydeman Consulting tydeman at tybor.com Testing, numerics, programming +1 (702) 608-6093 Vice-chair of PL22.11 (ANSI "C") Sample C99+FPCE tests: http://www.tybor.com Savers sleep well, investors eat well, spenders work forever.