11175 libm should use signbit() correctly
11188 c99 math macros should return strictly backward compatible values

@@ -48,11 +48,12 @@
 static const long double
         two24l = 16777216.0L,
         pio4   = 0.7853981633974483096156608458198757210495L;
 
 int
-__rem_pio2l(long double x, long double *y) {
+__rem_pio2l(long double x, long double *y)
+{
         long double z, w;
         double t[5], v[5];
         int e0, i, nx, n, sign;
         const int *ipio2;
 

@@ -64,23 +65,23 @@
                 return (0);
         }
         e0 = ilogbl(z) - 23;
         z = scalbnl(z, -e0);
         for (i = 0; i < 5; i++) {
-                t[i] = (double) ((int) (z));
-                z = (z - (long double) t[i]) * two24l;
+                t[i] = (double)((int)(z));
+                z = (z - (long double)t[i]) * two24l;
         }
         nx = 5;
         while (t[nx - 1] == 0.0)
                 nx--;           /* skip zero term */
         ipio2 = _TBL_ipio2l_inf;
-        n = __rem_pio2m(t, v, e0, nx, 3, (const int *) ipio2);
-        z = (long double) v[2] + (long double) v[1];
-        w = (long double) v[0];
+        n = __rem_pio2m(t, v, e0, nx, 3, (const int *)ipio2);
+        z = (long double)v[2] + (long double)v[1];
+        w = (long double)v[0];
         y[0] = z + w;
         y[1] = z - (y[0] - w);
-        if (sign == 1) {
+        if (sign != 0) {
                 y[0] = -y[0];
                 y[1] = -y[1];
                 return (-n);
         }
         return (n);