diff options
Diffstat (limited to 'math/s_csqrt.c')
| -rw-r--r-- | math/s_csqrt.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/math/s_csqrt.c b/math/s_csqrt.c index 75da2e7449..1f073e7f17 100644 --- a/math/s_csqrt.c +++ b/math/s_csqrt.c @@ -1,5 +1,5 @@ /* Complex square root of double value. - 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. Based on an algorithm by Stephen L. Moshier <moshier@world.std.com>. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. @@ -104,10 +104,10 @@ __csqrt (__complex__ double x) __real__ x = 0.0; __imag__ x = __scalbn (__imag__ x, -2 * scale); } - else if (fabs (__real__ x) < DBL_MIN - && fabs (__imag__ x) < DBL_MIN) + else if (fabs (__real__ x) < 2.0 * DBL_MIN + && fabs (__imag__ x) < 2.0 * DBL_MIN) { - scale = -(DBL_MANT_DIG / 2); + scale = -((DBL_MANT_DIG + 1) / 2); __real__ x = __scalbn (__real__ x, -2 * scale); __imag__ x = __scalbn (__imag__ x, -2 * scale); } @@ -148,6 +148,9 @@ __csqrt (__complex__ double x) s = __scalbn (s, scale); } + math_check_force_underflow (r); + math_check_force_underflow (s); + __real__ res = r; __imag__ res = __copysign (s, __imag__ x); } |