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math: fix 128bit long double inverse trigonometric functions
[musl]
/
src
/
math
/
log2l.c
diff --git
a/src/math/log2l.c
b/src/math/log2l.c
index
8ebce9c
..
722b451
100644
(file)
--- 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].
* 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"
*/
#include "libm.h"
@@
-113,8
+108,7
@@
static const long double S[4] = {
long double log2l(long double x)
{
long double log2l(long double x)
{
- volatile long double z;
- long double y;
+ long double y, z;
int e;
if (isnan(x))
int e;
if (isnan(x))
@@
-123,8
+117,8
@@
long double log2l(long double x)
return x;
if (x <= 0.0) {
if (x == 0.0)
return x;
if (x <= 0.0) {
if (x == 0.0)
- return -
INFINITY;
- return
NAN;
+ return -
1/(x*x); /* -inf with divbyzero */
+ return
0/0.0f; /* nan with invalid */
}
/* separate mantissa from exponent */
}
/* separate mantissa from exponent */
@@
-179,4
+173,10
@@
done:
z += e;
return z;
}
z += e;
return z;
}
+#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
+// TODO: broken implementation to make things compile
+long double log2l(long double x)
+{
+ return log2(x);
+}
#endif
#endif