G.6.3.2 The clog functions

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• clog(conj(z)) = conj(clog(z)).

• clog(-0 + i0) returns -(inf) + ipi and raises the “divide-by-zero” floating-point exception.

• clog(+0 + i0) returns -(inf) + i0 and raises the “divide-by-zero” floating-point exception.

• clog(x + i (inf)) returns +(inf) + ipi /2, for finite x.

• clog(x + iNaN) returns NaN + iNaN and optionally raises the “invalid” floating- point exception, for finite x.

• clog(-(inf) + iy) returns +(inf) + ipi , for finite positive-signed y.

• clog(+(inf) + iy) returns +(inf) + i0, for finite positive-signed y.

• clog(-(inf) + i (inf)) returns +(inf) + i3pi /4.

• clog(+(inf) + i (inf)) returns +(inf) + ipi /4.

• clog((+-)(inf) + iNaN) returns +(inf) + iNaN.

• clog(NaN + iy) returns NaN + iNaN and optionally raises the “invalid” floating- point exception, for finite y.

• clog(NaN + i (inf)) returns +(inf) + iNaN.

• clog(NaN + iNaN) returns NaN + iNaN.