commit - 65688edf4c58356b6a78c043dae1a4832532b84f
commit + 70fb5a47142d240e33700b734a57433248225624
blob - 6e754fa0fcc088feab24c22e8d57cd3010845154
blob + a3ee66c02ed67883bf020b9f55312657a914e840
--- lib/diff_myers.c
+++ lib/diff_myers.c
@@ -250,6 +250,8 @@ diff_divide_myers_forward(bool *found_midpoint,
 			 * yet, get the initial x from the top left of the Myers
 			 * graph. */
 			x = 0;
+			prev_x = x;
+			prev_y = xk_to_y(x, k);
 		}
 		/* Favoring "-" lines first means favoring moving rightwards in
 		 * the Myers graph.
@@ -561,6 +563,8 @@ diff_divide_myers_backward(bool *found_midpoint,
 			 * yet, get the initial x from the bottom right of the
 			 * Myers graph. */
 			x = left->atoms.len;
+			prev_x = x;
+			prev_y = xc_to_y(x, c, delta);
 		}
 		/* Favoring "-" lines first means favoring moving rightwards in
 		 * the Myers graph.
@@ -876,7 +880,7 @@ diff_algo_myers_divide(const struct diff_algo_config *
 			 * midpoint, to not step into another diff algo
 			 * recursion with unchanged box. */
 			int delta = (int)right->atoms.len - (int)left->atoms.len;
-			int x;
+			int x = 0;
 			int y;
 			int i;
 			int best_forward_i = 0;