summaryrefslogtreecommitdiff
path: root/src/math/logbl.c
blob: 5d04abd764404dbb166ae01d18c25cba9b07d679 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
#include <limits.h>
#include "libm.h"
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double logbl(long double x)
{
	return logb(x);
}
#else
long double logbl(long double x)
{
	int i = ilogbl(x);

	if (i == FP_ILOGB0)
		return -1.0/fabsl(x);
	if (i == FP_ILOGBNAN || i == INT_MAX)
		return x * x;
	return i;
}
#endif