X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ftrigl.h;h=79dc38b5f34518b5311e5ad2acc12b0696df92af;hb=3213c107e7632d3b7e462c06acaefde7d50e5067;hp=b4a7a154068c4ed06121cd5f82aeba2a9b03d98a;hpb=5657b2536d242966c41c268b9ab4fe8df727bb13;p=gnulib.git

diff --git a/lib/trigl.h b/lib/trigl.h
index b4a7a1540..79dc38b5f 100644
--- a/lib/trigl.h
+++ b/lib/trigl.h
@@ -1,27 +1,35 @@
 /* Declarations for sinl, cosl, tanl internal functions
    Contributed by Paolo Bonzini
 
-   Copyright 2002, 2003 Free Software Foundation, Inc.
+   Copyright 2002, 2003, 2009, 2010 Free Software Foundation, Inc.
 
    This file is part of gnulib.
 
-   gnulib is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as published
-   by the Free Software Foundation; either version 2.1, or (at your option)
-   any later version.
+   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 3 of the License, or
+   (at your option) any later version.
 
-   gnulib 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 Lesser General Public
-   License for more details.
+   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 Lesser General Public License
-   along with gnulib; see the file COPYING.LIB.  If not, write to the Free
-   Software Foundation, 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);