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Vincent Lefèvre a écrit: > ... It's strange that GCC doesn't replace isnan() by a test x != x Perhaps because these are NOT equivalent? They differ for SNaN. So the interval programmer should indeed use x!=x because, if an SNaN does sneak into the computation, it should be detected (e.g. NaI vs Empty). Michel. ---Sent: 2010-10-15 10:42:35 UTC