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authorSzabolcs Nagy <nsz@port70.net>2012-11-13 00:30:06 +0100
committerSzabolcs Nagy <nsz@port70.net>2012-11-13 00:30:06 +0100
commit37aa7f7301d6526c14635375886acd881b471f6c (patch)
tree38ce6534902db36bb952f4c0085d1b053c423ab4 /src/math
parent04ccbdca6d88738e23e0d6a622ad33854c468646 (diff)
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math: raise flags in log2l.c on <= 0 arguments, and fix volatile
Diffstat (limited to 'src/math')
-rw-r--r--src/math/log2l.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/src/math/log2l.c b/src/math/log2l.c
index 8ebce9c4..76a7aacd 100644
--- a/src/math/log2l.c
+++ b/src/math/log2l.c
@@ -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"
@@ -113,7 +108,7 @@ static const long double S[4] = {
long double log2l(long double x)
{
- volatile long double z;
+ long double z;
long double y;
int e;
@@ -123,8 +118,8 @@ long double log2l(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 */