+/* We need to be careful that we don't blow our stack. Function f, in the
+ worst case, needs to fit on the stack:
+
+ * 40 int[CHUNK] arrays;
+ * ~40 ints;
+ * ~40 pointers for stdarg passing.
+
+ Subtract the last two off STACK_SIZE and figure out what the maximum
+ chunk size can be. We make the last bit conservative to account for
+ register saves and other processor-dependent saving. */
+#define CHUNK ((STACK_SIZE-40*sizeof(int)-256*sizeof(void *))/40/sizeof(int))