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math: raise flags in logl.c on <= 0 arguments

This commit is contained in:
Szabolcs Nagy 2012-11-13 00:49:55 +01:00
parent 52bcf3f5fb
commit e2fe959fe2
2 changed files with 3 additions and 9 deletions
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3
src/math/log2l.c
View File

@ -108,8 +108,7 @@ static const long double S[4] = {
long double log2l(long double x)
{
long double z;
long double y;
long double y, z;
int e;
if (isnan(x))

9
src/math/logl.c
View File

@ -50,11 +50,6 @@
* In the tests over the interval exp(+-10000), the logarithms
* of the random arguments were uniformly distributed over
* [-10000, +10000].
*
* ERROR MESSAGES:
*
* log singularity: x = 0; returns -INFINITY
* log domain: x < 0; returns NAN
*/
#include "libm.h"
@ -121,8 +116,8 @@ long double logl(long double x)
return x;
if (x <= 0.0) {
if (x == 0.0)
return -INFINITY;
return NAN;
return -1/(x+0); /* -inf with divbyzero */
return 0/0.0f; /* nan with invalid */
}
/* separate mantissa from exponent */