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Fix clog, clog10 spurious underflow exceptions (bug 14337).

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This commit is contained in:
Joseph Myers
2012-07-09 11:06:34 +00:00
parent ad41a87fe0
commit 638a572eb0
11 changed files with 474 additions and 55 deletions
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23
math/s_clogf.c
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@ -40,25 +40,30 @@ __clogf (__complex__ float x)
else if (__builtin_expect (rcls != FP_NAN && icls != FP_NAN, 1))
{
/* Neither real nor imaginary part is NaN. */
float absx = fabsf (__real__ x), absy = fabsf (__imag__ x);
float d;
int scale = 0;
if (fabsf (__real__ x) > FLT_MAX / 2.0f
|| fabsf (__imag__ x) > FLT_MAX / 2.0f)
if (absx > FLT_MAX / 2.0f)
{
scale = -1;
__real__ x = __scalbnf (__real__ x, scale);
__imag__ x = __scalbnf (__imag__ x, scale);
absx = __scalbnf (absx, scale);
absy = (absy >= FLT_MIN * 2.0f ? __scalbnf (absy, scale) : 0.0f);
}
else if (fabsf (__real__ x) < FLT_MIN
&& fabsf (__imag__ x) < FLT_MIN)
else if (absy > FLT_MAX / 2.0f)
{
scale = -1;
absx = (absx >= FLT_MIN * 2.0f ? __scalbnf (absx, scale) : 0.0f);
absy = __scalbnf (absy, scale);
}
else if (absx < FLT_MIN && absy < FLT_MIN)
{
scale = FLT_MANT_DIG;
__real__ x = __scalbnf (__real__ x, scale);
__imag__ x = __scalbnf (__imag__ x, scale);
absx = __scalbnf (absx, scale);
absy = __scalbnf (absy, scale);
}
d = __ieee754_hypotf (__real__ x, __imag__ x);
d = __ieee754_hypotf (absx, absy);
__real__ result = __ieee754_logf (d) - scale * (float) M_LN2;
__imag__ result = __ieee754_atan2f (__imag__ x, __real__ x);