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Don't generate underflow for very small values in log1pl.

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* sysdeps/ieee754/ldbl-128/s_log1pl.c (__log1pl): If xm1 is
	smaller than LDBL_EPSILON/2.0L, just return xm1.
This commit is contained in:
David S. Miller 2012-11-16 09:31:38 -08:00
parent bcbf9830b7
commit 447885ebf1
2 changed files with 11 additions and 0 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2012-11-16 David S. Miller <davem@davemloft.net>
* sysdeps/ieee754/ldbl-128/s_log1pl.c (__log1pl): If xm1 is
smaller than LDBL_EPSILON/2.0L, just return xm1.
2012-11-16 H.J. Lu <hongjiu.lu@intel.com>
* elf/tst-array1.c (init): Set constructor priority to 1000.

6
sysdeps/ieee754/ldbl-128/s_log1pl.c
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@ -138,6 +138,12 @@ __log1pl (long double xm1)
&& (u.parts32.w1 | u.parts32.w2 | u.parts32.w3) == 0)
return xm1;
if ((hx & 0x7fffffff) < 0x3f8e0000)
{
if ((int) xm1 == 0)
return xm1;
}
x = xm1 + 1.0L;
/* log1p(-1) = -inf */