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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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17
libc/math/logb.c Normal file
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#include "libc/math/math.h"
/*
special cases:
logb(+-0) = -inf, and raise divbyzero
logb(+-inf) = +inf
logb(nan) = nan
*/
double logb(double x)
{
if (!isfinite(x))
return x * x;
if (x == 0)
return -1/(x*x);
return ilogb(x);
}