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Fix inaccuracy of clog, clog10 near |z| = 1 (bug 13629).

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This commit is contained in:
Joseph Myers
2012-09-25 19:43:49 +00:00
parent c8cb2a5224
commit d032e0d29b
19 changed files with 1003 additions and 10 deletions
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13
math/s_clog10l.c
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@ -89,6 +89,19 @@ __clog10l (__complex__ long double x)
d2m1 += absy * absy;
__real__ result = __log1pl (d2m1) * (M_LOG10El / 2.0L);
}
else if (absx < 1.0L
&& absx >= 0.75L
&& absy < LDBL_EPSILON / 2.0L
&& scale == 0)
{
long double d2m1 = (absx - 1.0L) * (absx + 1.0L);
__real__ result = __log1pl (d2m1) * (M_LOG10El / 2.0L);
}
else if (absx < 1.0L && (absx >= 0.75L || absy >= 0.5L) && scale == 0)
{
long double d2m1 = __x2y2m1l (absx, absy);
__real__ result = __log1pl (d2m1) * (M_LOG10El / 2.0L);
}
else
{
long double d = __ieee754_hypotl (absx, absy);