F.9.3.9 The log1p functions

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• log1p((+-)0) returns (+-)0.

• log1p(-1) returns -(inf) and raises the “divide-by-zero” floating-point exception.

• log1p(x) returns a NaN and raises the “invalid” floating-point exception for x < -1.

• log1p(+(inf)) returns +(inf).