X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ftrigl.h;h=d71ace954998f5837f8b47c1c0b5c13f5cac1a17;hb=b781b33a9eee9f2bdb70f8fc51f6d1ec5ebbbd02;hp=330a41c229841dd1538e2a9052f09e0fe04e6806;hpb=3030c5b5e0a5199e16b05927da72c43c42f211c3;p=gnulib.git

diff --git a/lib/trigl.h b/lib/trigl.h
index 330a41c22..d71ace954 100644
--- a/lib/trigl.h
+++ b/lib/trigl.h
@@ -1,7 +1,7 @@
 /* Declarations for sinl, cosl, tanl internal functions
    Contributed by Paolo Bonzini
 
-   Copyright 2002, 2003, 2009 Free Software Foundation, Inc.
+   Copyright 2002-2003, 2009-2011 Free Software Foundation, Inc.
 
    This file is part of gnulib.
 
@@ -18,7 +18,18 @@
    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);