[BZ #16427] Fix ldbl-128 exp overflows.

Invoke the non-IEEE handling only for numbers special also in the IEEE
case.  This aligns the exp handling with the other ldbl variants.

diff --git a/ChangeLog b/ChangeLog
index 4eab511..d455e16 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2014-01-15  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
 
+       [BZ #16427]
+       * sysdeps/ieee754/ldbl-128/w_expl.c (__expl): Invoke the non-IEEE
+       handling only for numbers special also in the IEEE case.
+
+2014-01-15  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
+
        * sysdeps/s390/fpu/libm-test-ulps: Regenerate.
 
 2014-01-11  Allan McRae  <allan@archlinux.org>

diff --git a/sysdeps/ieee754/ldbl-128/w_expl.c b/sysdeps/ieee754/ldbl-128/w_expl.c
index 10193be..f0b1f8e 100644 (file)
--- a/sysdeps/ieee754/ldbl-128/w_expl.c
+++ b/sysdeps/ieee754/ldbl-128/w_expl.c
@@ -25,24 +25,16 @@ static char rcsid[] = "$NetBSD: $";
 #include <math.h>
 #include <math_private.h>
 
-static const long double
-o_threshold= 1.1356523406294143949491931077970763428449E4L,
-u_threshold= -1.1433462743336297878837243843452621503410E4;
-
 long double __expl(long double x)      /* wrapper exp */
 {
 #ifdef _IEEE_LIBM
        return __ieee754_expl(x);
 #else
-       long double z;
-       z = __ieee754_expl(x);
-       if(_LIB_VERSION == _IEEE_) return z;
-       if(__finitel(x)) {
-           if(x>o_threshold)
-               return __kernel_standard_l(x,x,206); /* exp overflow */
-           else if(x<u_threshold)
-               return __kernel_standard_l(x,x,207); /* exp underflow */
-       }
+       long double z = __ieee754_expl (x);
+       if (__glibc_unlikely (!__finitel (z) || z == 0)
+           && __finitel (x) && _LIB_VERSION != _IEEE_)
+         return __kernel_standard_l (x, x, 206 + !!__signbitl (x));
+
        return z;
 #endif
 }