X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=lib%2Fcosl.c;h=884cec8c6669d7766c8f549affb6f2ff167dc66b;hb=b1eaa47f003b6a9a227a56967e2c650515a6432b;hp=f019eee61b2868689a1f06503bd0d50467fd2f55;hpb=5657b2536d242966c41c268b9ab4fe8df727bb13;p=gnulib.git

diff --git a/lib/cosl.c b/lib/cosl.c
index f019eee61..884cec8c6 100644
--- a/lib/cosl.c
+++ b/lib/cosl.c
@@ -13,26 +13,31 @@
  * ====================================================
  */
 
+#include <config.h>
+
+/* Specification.  */
+#include <math.h>
+
 /* sinl(x)
  * Return sine function of x.
  *
  * kernel function:
- *	__kernel_sinl		... sine function on [-pi/4,pi/4]
- *	__kernel_cosl		... cose function on [-pi/4,pi/4]
- *	__ieee754_rem_pio2l	... argument reduction routine
+ *      __kernel_sinl           ... sine function on [-pi/4,pi/4]
+ *      __kernel_cosl           ... cose function on [-pi/4,pi/4]
+ *      __ieee754_rem_pio2l     ... argument reduction routine
  *
  * Method.
  *      Let S,C and T denote the sin, cos and tan respectively on
- *	[-PI/4, +PI/4]. Reduce the argument x to y1+y2 = x-k*pi/2
- *	in [-pi/4 , +pi/4], and let n = k mod 4.
- *	We have
+ *      [-PI/4, +PI/4]. Reduce the argument x to y1+y2 = x-k*pi/2
+ *      in [-pi/4 , +pi/4], and let n = k mod 4.
+ *      We have
  *
  *          n        sin(x)      cos(x)        tan(x)
  *     ----------------------------------------------------------
- *	    0	       S	   C		 T
- *	    1	       C	  -S		-1/T
- *	    2	      -S	  -C		 T
- *	    3	      -C	   S		-1/T
+ *          0          S           C             T
+ *          1          C          -S            -1/T
+ *          2         -S          -C             T
+ *          3         -C           S            -1/T
  *     ----------------------------------------------------------
  *
  * Special cases:
@@ -41,49 +46,45 @@
  *      trig(NaN)    is that NaN;
  *
  * Accuracy:
- *	TRIG(x) returns trig(x) nearly rounded
+ *      TRIG(x) returns trig(x) nearly rounded
  */
 
-#include <math.h>
-
-#include "mathl.h"
-
 #include "trigl.h"
-#ifdef HAVE_SINL
-#include "trigl.c"
-#include "sincosl.c"
-#endif
 
 long double cosl(long double x)
 {
-	long double y[2],z=0.0L;
-	int n;
+        long double y[2],z=0.0L;
+        int n;
+
+    /* cosl(NaN) is NaN */
+        if (isnanl (x))
+          return x;
 
     /* |x| ~< pi/4 */
         if(x >= -0.7853981633974483096156608458198757210492 &&
            x <= 0.7853981633974483096156608458198757210492)
           return kernel_cosl(x, z);
 
-    /* sinl(Inf or NaN) is NaN, sinl(0) is 0 */
-        else if ((x + x == x && x != 0.0) || x != x)
+    /* cosl(Inf) is NaN, cosl(0) is 1 */
+        else if (x + x == x && x != 0.0)
           return x-x;           /* NaN */
 
     /* argument reduction needed */
-	else {
-	    n = ieee754_rem_pio2l(x,y);
+        else {
+            n = ieee754_rem_pio2l(x,y);
             switch(n&3) {
                 case 0: return  kernel_cosl(y[0],y[1]);
                 case 1: return -kernel_sinl(y[0],y[1],1);
                 case 2: return -kernel_cosl(y[0],y[1]);
                 default:
                         return  kernel_sinl(y[0],y[1],1);
-	    }
-	}
+            }
+        }
 }
 
 #if 0
 int
-main ()
+main (void)
 {
   printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492));
   printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492 *29));