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Improve clog, clog10 handling of values with real or imaginary part 1 (bug 13629).

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This commit is contained in:
Joseph Myers
2012-07-26 11:31:35 +00:00
parent 3129cfc6ec
commit da865e95bc
10 changed files with 318 additions and 54 deletions
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29
math/s_clogl.c
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@@ -41,21 +41,21 @@ __clogl (__complex__ long double x)
{
/* Neither real nor imaginary part is NaN. */
long double absx = fabsl (__real__ x), absy = fabsl (__imag__ x);
long double d;
int scale = 0;
if (absx < absy)
{
long double t = absx;
absx = absy;
absy = t;
}
if (absx > LDBL_MAX / 2.0L)
{
scale = -1;
absx = __scalbnl (absx, scale);
absy = (absy >= LDBL_MIN * 2.0L ? __scalbnl (absy, scale) : 0.0L);
}
else if (absy > LDBL_MAX / 2.0L)
{
scale = -1;
absx = (absx >= LDBL_MIN * 2.0L ? __scalbnl (absx, scale) : 0.0L);
absy = __scalbnl (absy, scale);
}
else if (absx < LDBL_MIN && absy < LDBL_MIN)
{
scale = LDBL_MANT_DIG;
@@ -63,9 +63,20 @@ __clogl (__complex__ long double x)
absy = __scalbnl (absy, scale);
}
d = __ieee754_hypotl (absx, absy);
if (absx == 1.0L && scale == 0)
{
long double absy2 = absy * absy;
if (absy2 <= LDBL_MIN * 2.0L)
__real__ result = absy2 / 2.0L - absy2 * absy2 / 4.0L;
else
__real__ result = __log1pl (absy2) / 2.0L;
}
else
{
long double d = __ieee754_hypotl (absx, absy);
__real__ result = __ieee754_logl (d) - scale * M_LN2l;
}
__real__ result = __ieee754_logl (d) - scale * M_LN2l;
__imag__ result = __ieee754_atan2l (__imag__ x, __real__ x);
}
else