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authorSzabolcs Nagy <nsz@port70.net>2012-11-12 23:41:48 +0100
committerSzabolcs Nagy <nsz@port70.net>2012-11-12 23:41:48 +0100
commit6f64505df37c41d7496612dffe86048765339a7a (patch)
tree807810ffbaa29337466fbd8c5fd5e66ee7e9c68b
parentb03c19a4b946b28dec03cf0820dc9d066fd143ce (diff)
downloadmusl-6f64505df37c41d7496612dffe86048765339a7a.tar.gz
math: fix exception behaviour of expm1l.c on inf and nan
-rw-r--r--src/math/expm1l.c20
1 files changed, 7 insertions, 13 deletions
diff --git a/src/math/expm1l.c b/src/math/expm1l.c
index ca0d141f..21a86c00 100644
--- a/src/math/expm1l.c
+++ b/src/math/expm1l.c
@@ -44,13 +44,7 @@
*
* Relative error:
* arithmetic domain # trials peak rms
- * IEEE -45,+MAXLOG 200,000 1.2e-19 2.5e-20
- *
- * ERROR MESSAGES:
- *
- * message condition value returned
- * expm1l overflow x > MAXLOG MAXNUM
- *
+ * IEEE -45,+maxarg 200,000 1.2e-19 2.5e-20
*/
#include "libm.h"
@@ -61,7 +55,6 @@ long double expm1l(long double x)
return expm1(x);
}
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
-static const long double MAXLOGL = 1.1356523406294143949492E4L;
/* exp(x) - 1 = x + 0.5 x^2 + x^3 P(x)/Q(x)
-.5 ln 2 < x < .5 ln 2
@@ -83,19 +76,20 @@ C1 = 6.93145751953125E-1L,
C2 = 1.428606820309417232121458176568075500134E-6L,
/* ln 2^-65 */
minarg = -4.5054566736396445112120088E1L,
-huge = 0x1p10000L;
+/* ln 2^16384 */
+maxarg = 1.1356523406294143949492E4L;
long double expm1l(long double x)
{
long double px, qx, xx;
int k;
- /* Overflow. */
- if (x > MAXLOGL)
- return huge*huge; /* overflow */
+ if (isnan(x))
+ return x;
+ if (x > maxarg)
+ return x*0x1p16383L; /* overflow, unless x==inf */
if (x == 0.0)
return x;
- /* Minimum value.*/
if (x < minarg)
return -1.0;