X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fcosl.c;h=20786c147eaabaa766c019a5fba7bf5549518a52;hb=04606dd55fd8f1a122a21c4b4e09ab2a36498385;hp=3c28f77c6db93ad510b0580ac689ab26151685f0;hpb=e1123c2f4fedae90435426a82a05cf2e3233e97d;p=gnulib.git

diff --git a/lib/cosl.c b/lib/cosl.c
index 3c28f77c6..20786c147 100644
--- a/lib/cosl.c
+++ b/lib/cosl.c
@@ -60,13 +60,17 @@ 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);
 
-    /* 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 */