X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fcosl.c;h=d4485480f6b276ab8e47ea445d8a3e686ce8e844;hb=43593319b31e6b0175b8eec4433bac744959822d;hp=53df794a1e28f9d1f7fdf5c02e63155f36581dcd;hpb=441aa3044f43e5572f58c354f01e6bc070acd5c7;p=gnulib.git

diff --git a/lib/cosl.c b/lib/cosl.c
index 53df794a1..d4485480f 100644
--- a/lib/cosl.c
+++ b/lib/cosl.c
@@ -18,12 +18,24 @@
 /* Specification.  */
 #include <math.h>
 
-/* sinl(x)
- * Return sine function of x.
+#if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
+
+long double
+cosl (long double x)
+{
+  return cos (x);
+}
+
+#else
+
+/* Code based on glibc/sysdeps/ieee754/ldbl-128/s_cosl.c.  */
+
+/* cosl(x)
+ * Return cosine function of x.
  *
  * kernel function:
  *      __kernel_sinl           ... sine function on [-pi/4,pi/4]
- *      __kernel_cosl           ... cose function on [-pi/4,pi/4]
+ *      __kernel_cosl           ... cosine function on [-pi/4,pi/4]
  *      __ieee754_rem_pio2l     ... argument reduction routine
  *
  * Method.
@@ -49,54 +61,58 @@
  *      TRIG(x) returns trig(x) nearly rounded
  */
 
-#include "trigl.h"
-#ifdef HAVE_SINL
-#include "trigl.c"
-#include "sincosl.c"
-#endif
+# include "trigl.h"
 
-long double cosl(long double x)
+long double
+cosl (long double x)
 {
-        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);
-
-    /* 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);
-            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);
-            }
+  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);
+
+  /* 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);
+      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);
         }
+    }
 }
 
+#endif
+
 #if 0
 int
 main (void)
 {
-  printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492));
-  printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492 *29));
-  printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492 *2));
-  printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492 *30));
-  printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492 *4));
-  printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492 *32));
-  printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492 *2/3));
-  printf ("%.16Lg\n", cosl(0.7853981633974483096156608458198757210492 *4/3));
+  printf ("%.16Lg\n", cosl (0.7853981633974483096156608458198757210492));
+  printf ("%.16Lg\n", cosl (0.7853981633974483096156608458198757210492 *29));
+  printf ("%.16Lg\n", cosl (0.7853981633974483096156608458198757210492 *2));
+  printf ("%.16Lg\n", cosl (0.7853981633974483096156608458198757210492 *30));
+  printf ("%.16Lg\n", cosl (0.7853981633974483096156608458198757210492 *4));
+  printf ("%.16Lg\n", cosl (0.7853981633974483096156608458198757210492 *32));
+  printf ("%.16Lg\n", cosl (0.7853981633974483096156608458198757210492 *2/3));
+  printf ("%.16Lg\n", cosl (0.7853981633974483096156608458198757210492 *4/3));
 }
 #endif