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math: fix exception behaviour of expm1l.c on inf and nan
author
Szabolcs Nagy
<nsz@port70.net>
Mon, 12 Nov 2012 22:41:48 +0000
(23:41 +0100)
committer
Szabolcs Nagy
<nsz@port70.net>
Mon, 12 Nov 2012 22:41:48 +0000
(23:41 +0100)
src/math/expm1l.c
patch
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diff --git
a/src/math/expm1l.c
b/src/math/expm1l.c
index
ca0d141
..
21a86c0
100644
(file)
--- a/
src/math/expm1l.c
+++ b/
src/math/expm1l.c
@@
-44,13
+44,7
@@
*
* Relative error:
* arithmetic domain # trials peak rms
*
* 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"
*/
#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
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
/* 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,
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;
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;
if (x == 0.0)
return x;
- /* Minimum value.*/
if (x < minarg)
return -1.0;
if (x < minarg)
return -1.0;