Stephen Canon d327828141 APFloat: x - NaN needs to flip the signbit of NaN when x is a number. ...

Because we don't have a separate negate( ) function, 0 - NaN does double-duty as the IEEE-754 negate( ) operation, which (unlike most FP ops) *does* attach semantic meaning to the signbit of NaN.

llvm-svn: 210428

2014-06-08 16:53:31 +00:00

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