diff options
Diffstat (limited to 'math/s_clogl.c')
| -rw-r--r-- | math/s_clogl.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/math/s_clogl.c b/math/s_clogl.c index d98a3c02c1..eaba572ce7 100644 --- a/math/s_clogl.c +++ b/math/s_clogl.c @@ -22,6 +22,13 @@ #include <math_private.h> #include <float.h> +/* To avoid spurious underflows, use this definition to treat IBM long + double as approximating an IEEE-style format. */ +#if LDBL_MANT_DIG == 106 +# undef LDBL_EPSILON +# define LDBL_EPSILON 0x1p-106L +#endif + __complex__ long double __clogl (__complex__ long double x) { @@ -71,6 +78,13 @@ __clogl (__complex__ long double x) else __real__ result = __log1pl (absy2) / 2.0L; } + else if (absx > 1.0L && absx < 2.0L && absy < 1.0L && scale == 0) + { + long double d2m1 = (absx - 1.0L) * (absx + 1.0L); + if (absy >= LDBL_EPSILON) + d2m1 += absy * absy; + __real__ result = __log1pl (d2m1) / 2.0L; + } else { long double d = __ieee754_hypotl (absx, absy); |