diff options
Diffstat (limited to 'libquadmath/math/acosq.c')
| -rw-r--r-- | libquadmath/math/acosq.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/libquadmath/math/acosq.c b/libquadmath/math/acosq.c index 7f2ed2725d1..2690cd3192d 100644 --- a/libquadmath/math/acosq.c +++ b/libquadmath/math/acosq.c @@ -10,11 +10,11 @@ */ /* - __float128 expansions are + Long double expansions are Copyright (C) 2001 Stephen L. Moshier <moshier@na-net.ornl.gov> - and are incorporated herein by permission of the author. The author + and are incorporated herein by permission of the author. The author reserves the right to distribute this material elsewhere under different - copying permissions. These modifications are distributed here under + copying permissions. These modifications are distributed here under the following terms: This library is free software; you can redistribute it and/or @@ -28,8 +28,8 @@ Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public - License along with this library; if not, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ + License along with this library; if not, see + <http://www.gnu.org/licenses/>. */ /* acosq(x) * Method : @@ -57,7 +57,7 @@ #include "quadmath-imp.h" static const __float128 - one = 1.0Q, + one = 1, pio2_hi = 1.5707963267948966192313216916397514420986Q, pio2_lo = 4.3359050650618905123985220130216759843812E-35Q, @@ -272,11 +272,11 @@ acosq (__float128 x) s = sqrtq (z); /* Compute an extended precision square root from the Newton iteration s -> 0.5 * (s + z / s). - The change w from s to the improved value is + The change w from s to the improved value is w = 0.5 * (s + z / s) - s = (s^2 + z)/2s - s = (z - s^2)/2s. - Express s = f1 + f2 where f1 * f1 is exactly representable. + Express s = f1 + f2 where f1 * f1 is exactly representable. w = (z - s^2)/2s = (z - f1^2 - 2 f1 f2 - f2^2)/2s . - s + w has extended precision. */ + s + w has extended precision. */ u.value = s; u.words32.w2 = 0; u.words32.w3 = 0; |