@@ -121,11 +121,11 @@
 #define Lp7     xxx[9]
 #define zero    xxx[10]
 
 double
 log1p(double x) {
-        double  hfsq, f, c, s, z, R, u;
+        double  hfsq, f, c = 0.0, s, z, R, u;
         int     k, hx, hu, ax;
 
         hx = ((int *)&x)[HIWORD];               /* high word of x */
         ax = hx & 0x7fffffff;
 

@@ -150,10 +150,11 @@
                         k = 0;
                         f = x;
                         hu = 1;
                 }
         }
+        /* We will initialize 'c' here. */
         if (k != 0) {
                 if (hx < 0x43400000) {
                         u = 1.0 + x;
                         hu = ((int *)&u)[HIWORD];       /* high word of u */
                         k = (hu >> 20) - 1023;

@@ -181,10 +182,11 @@
         hfsq = 0.5 * f * f;
         if (hu == 0) {          /* |f| < 2**-20 */
                 if (f == zero) {
                         if (k == 0)
                                 return (zero);
+                        /* We already initialized 'c' before, when (k != 0) */
                         c += k * ln2_lo;
                         return (k * ln2_hi + c);
                 }
                 R = hfsq * (1.0 - 0.66666666666666666 * f);
                 if (k == 0)