diff options
Diffstat (limited to 'libc/math/s_clogl.c')
| -rw-r--r-- | libc/math/s_clogl.c | 38 |
1 files changed, 27 insertions, 11 deletions
diff --git a/libc/math/s_clogl.c b/libc/math/s_clogl.c index 8968eefee..d98a3c02c 100644 --- a/libc/math/s_clogl.c +++ b/libc/math/s_clogl.c @@ -40,27 +40,43 @@ __clogl (__complex__ long double x) else if (__builtin_expect (rcls != FP_NAN && icls != FP_NAN, 1)) { /* Neither real nor imaginary part is NaN. */ - long double d; + long double absx = fabsl (__real__ x), absy = fabsl (__imag__ x); int scale = 0; - if (fabsl (__real__ x) > LDBL_MAX / 2.0L - || fabsl (__imag__ x) > LDBL_MAX / 2.0L) + if (absx < absy) + { + long double t = absx; + absx = absy; + absy = t; + } + + if (absx > LDBL_MAX / 2.0L) { scale = -1; - __real__ x = __scalbnl (__real__ x, scale); - __imag__ x = __scalbnl (__imag__ x, scale); + absx = __scalbnl (absx, scale); + absy = (absy >= LDBL_MIN * 2.0L ? __scalbnl (absy, scale) : 0.0L); } - else if (fabsl (__real__ x) < LDBL_MIN - && fabsl (__imag__ x) < LDBL_MIN) + else if (absx < LDBL_MIN && absy < LDBL_MIN) { scale = LDBL_MANT_DIG; - __real__ x = __scalbnl (__real__ x, scale); - __imag__ x = __scalbnl (__imag__ x, scale); + absx = __scalbnl (absx, scale); + absy = __scalbnl (absy, scale); } - d = __ieee754_hypotl (__real__ x, __imag__ x); + 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 |