X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fsinl.c;h=eb0e05b6ec823626c6fd02bb191e03ce65502ba1;hb=744df8b1de32a5c4047aff5e9a9fa8b680ffea6f;hp=cb090b3209f4e4030e10dfa37e0695439e642db1;hpb=932b68847804db93ae058c71d6236d2dc4c905b7;p=gnulib.git

diff --git a/lib/sinl.c b/lib/sinl.c
index cb090b320..eb0e05b6e 100644
--- a/lib/sinl.c
+++ b/lib/sinl.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:
@@ -41,13 +46,9 @@
  *      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"
 #include "trigl.c"
 #include "sincosl.c"
@@ -58,30 +59,34 @@ sinl (long double x)
   long double y[2], z = 0.0L;
   int n;
 
+  /* sinl(NaN) is NaN */
+  if (isnanl (x))
+    return x;
+
   /* |x| ~< pi/4 */
   if (x >= -0.7853981633974483096156608458198757210492 &&
       x <= 0.7853981633974483096156608458198757210492)
     return kernel_sinl (x, z, 0);
 
-    /* sinl(Inf or NaN) is NaN, sinl(0) is 0 */
-  else if (x + x == x || x != x)
-    return x - x;		/* NaN */
+    /* sinl(Inf) is NaN, sinl(0) is 0 */
+  else if (x + x == x)
+    return x - x;               /* NaN */
 
   /* argument reduction needed */
   else
     {
       n = ieee754_rem_pio2l (x, y);
       switch (n & 3)
-	{
-	case 0:
-	  return kernel_sinl (y[0], y[1], 1);
-	case 1:
-	  return kernel_cosl (y[0], y[1]);
-	case 2:
-	  return -kernel_sinl (y[0], y[1], 1);
-	default:
-	  return -kernel_cosl (y[0], y[1]);
-	}
+        {
+        case 0:
+          return kernel_sinl (y[0], y[1], 1);
+        case 1:
+          return kernel_cosl (y[0], y[1]);
+        case 2:
+          return -kernel_sinl (y[0], y[1], 1);
+        default:
+          return -kernel_cosl (y[0], y[1]);
+        }
     }
 }