commit 879f9a79f56e18d85f7992cc5abd3595a0bb7d62
from: Neels Hofmeyr <neels@hofmeyr.de>
date: Tue May 05 04:56:21 2020 UTC

debug: myers divide: log nr of identical lines slid over

commit - 4c42e835223f6d22891beb0abc2d2663ae3d9b7a
commit + 879f9a79f56e18d85f7992cc5abd3595a0bb7d62
blob - 1acfa698d7852914725eff21eebb0a9ebc77795b
blob + eb67565c358300506376e716dea9b9c42a2ed8a1
--- lib/diff_myers.c
+++ lib/diff_myers.c
@@ -263,6 +263,9 @@ static void diff_divide_myers_forward(struct diff_data
 		       && diff_atom_same(&left->atoms.head[x], &right->atoms.head[xk_to_y(x, k)]))
 		       x++;
 		kd_forward[k] = x;
+		if (x_before_slide != x) {
+			debug("  down %d similar lines\n", x - x_before_slide);
+		}
 
 		if (DEBUG) {
 			int fi;
@@ -511,6 +514,9 @@ static void diff_divide_myers_backward(struct diff_dat
 		       && diff_atom_same(&left->atoms.head[x-1], &right->atoms.head[xc_to_y(x, c, delta)-1]))
 			x--;
 		kd_backward[c] = x;
+		if (x_before_slide != x) {
+			debug("  up %d similar lines\n", x_before_slide - x);
+		}
 
 		if (DEBUG) {
 			int fi;