commit 2fa08c64136f5b53fb382e8369815ef94ba74ce0
from: Neels Hofmeyr <neels@hofmeyr.de>
date: Thu Oct 22 01:17:21 2020 UTC

optimize diff_atom_same(): if hashes differ, return false

commit - 845f35754a8e7935c62f11f48d5dedd536a0615c
commit + 2fa08c64136f5b53fb382e8369815ef94ba74ce0
blob - 23c9144b4f1d0b6f1c12b6cbfb0ee1af139d4671
blob + 7c1b831a3433f7d51209934dad51ee7c36826bae
--- lib/diff_main.c
+++ lib/diff_main.c
@@ -198,7 +198,12 @@ diff_atom_same(bool *same,
 	       const struct diff_atom *right)
 {
 	int cmp;
-	int r = diff_atom_cmp(&cmp, left, right);
+	int r;
+	if (left->hash != right->hash) {
+		*same = false;
+		return 0;
+	}
+	r = diff_atom_cmp(&cmp, left, right);
 	if (r) {
 		*same = true;
 		return r;