raise_invalid
raise_invalid(int v) { /* SUSv3 requires ilogb(0,+/-Inf,NaN) raise invalid */
raise_invalid(int v) { /* SUSv3 requires ilogbl(0,+/-Inf,NaN) raise invalid */
raise_invalid(int v) { /* SUSv3 requires ilogbf(0,+/-Inf,NaN) raise invalid */