diff options
Diffstat (limited to 'math/s_clog.c')
| -rw-r--r-- | math/s_clog.c | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/math/s_clog.c b/math/s_clog.c index 15f04594e9..b546030313 100644 --- a/math/s_clog.c +++ b/math/s_clog.c @@ -1,5 +1,5 @@ /* Compute complex natural logarithm. - Copyright (C) 1997-2015 Free Software Foundation, Inc. + Copyright (C) 1997-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. @@ -65,15 +65,8 @@ __clog (__complex__ double x) if (absx == 1.0 && scale == 0) { - double absy2 = absy * absy; - if (absy2 <= DBL_MIN * 2.0) - { - double force_underflow = absy2 * absy2; - __real__ result = absy2 / 2.0; - math_force_eval (force_underflow); - } - else - __real__ result = __log1p (absy2) / 2.0; + __real__ result = __log1p (absy * absy) / 2.0; + math_check_force_underflow_nonneg (__real__ result); } else if (absx > 1.0 && absx < 2.0 && absy < 1.0 && scale == 0) { @@ -83,14 +76,17 @@ __clog (__complex__ double x) __real__ result = __log1p (d2m1) / 2.0; } else if (absx < 1.0 - && absx >= 0.75 + && absx >= 0.5 && absy < DBL_EPSILON / 2.0 && scale == 0) { double d2m1 = (absx - 1.0) * (absx + 1.0); __real__ result = __log1p (d2m1) / 2.0; } - else if (absx < 1.0 && (absx >= 0.75 || absy >= 0.5) && scale == 0) + else if (absx < 1.0 + && absx >= 0.5 + && scale == 0 + && absx * absx + absy * absy >= 0.5) { double d2m1 = __x2y2m1 (absx, absy); __real__ result = __log1p (d2m1) / 2.0; |