X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ftrigl.h;h=cab6ad34ef0227484a1ea06116a6c758050d7972;hb=5191b3546cfb6c163228c23f214e325ddf60d46f;hp=893fdc50aaa093db5fa1d7c5d1ca1b4e5d7d947a;hpb=d0723a1652f9f002aa800cd618fd52717b980b18;p=gnulib.git

diff --git a/lib/trigl.h b/lib/trigl.h
index 893fdc50a..cab6ad34e 100644
--- a/lib/trigl.h
+++ b/lib/trigl.h
@@ -1,25 +1,35 @@
 /* Declarations for sinl, cosl, tanl internal functions
    Contributed by Paolo Bonzini
 
-   Copyright 2002, 2003 Free Software Foundation, Inc.
+   Copyright 2002-2003, 2009-2013 Free Software Foundation, Inc.
 
    This file is part of gnulib.
 
-   This program is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
-   You should have received a copy of the GNU General Public License along
-   with this program; if not, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
+/* Decompose x into x = k * π/2 + r
+   where k is an integer and abs(r) <= π/4.
+   Store r in y[0] and y[1] (main part in y[0], small additional part in
+   y[1], r = y[0] + y[1]).
+   Return k.  */
 extern int ieee754_rem_pio2l (long double x, long double *y);
+
+/* Compute and return sinl (x + y), where x is the main part and y is the
+   small additional part of a floating-point number.
+   iy is 0 when y is known to be 0.0, otherwise iy is 1.  */
 extern long double kernel_sinl (long double x, long double y, int iy);
-extern long double kernel_cosl (long double x, long double y);
 
+/* Compute and return cosl (x + y), where x is the main part and y is the
+   small additional part of a floating-point number.  */
+extern long double kernel_cosl (long double x, long double y);