Major rename detection changes

After doing further profiling, I found that a lot of time was
being spent attempting to insert hashes into the file hash
signature when using the rolling hash because the rolling hash
approach generates a hash per byte of the file instead of one
per run/line of data.

To optimize this, I decided to convert back to a run-based file
signature algorithm which would be more like core Git.

After changing this, a number of the existing tests started to
fail.  In some cases, this appears to have been because the test
was coded to be too specific to the particular results of the file
similarity metric and in some cases there appear to have been bugs
in the core rename detection code where only by the coincidence
of the file similarity scoring were the expected results being
generated.

This renames all the variables in the core rename detection code
to be more consistent and hopefully easier to follow which made it
a bit easier to reason about the behavior of that code and fix the
problems that I was seeing.  I think it's in better shape now.

There are a couple of tests now that attempt to stress test the
rename detection code and they are quite slow.  Most of the time
is spent setting up the test data on disk and in the index.  When
we roll out performance improvements for index insertion, it
should also speed up these tests I hope.

src/hashsig.c

@@ -13,12 +13,15 @@ typedef uint64_t hashsig_state;
 
 #define HASHSIG_SCALE 100
 
-#define HASHSIG_HASH_WINDOW 32
-#define HASHSIG_HASH_START	0
+#define HASHSIG_MAX_RUN 80
+#define HASHSIG_HASH_START	0x012345678ABCDEF0LL
 #define HASHSIG_HASH_SHIFT  5
-#define HASHSIG_HASH_MASK   0x7FFFFFFF
+
+#define HASHSIG_HASH_MIX(S,CH) \
+	(S) = ((S) << HASHSIG_HASH_SHIFT) - (S) + (hashsig_state)(CH)
 
 #define HASHSIG_HEAP_SIZE ((1 << 7) - 1)
+#define HASHSIG_HEAP_MIN_SIZE 4
 
 typedef int (*hashsig_cmp)(const void *a, const void *b, void *);
 
@@ -28,14 +31,6 @@ typedef struct {
 	hashsig_t values[HASHSIG_HEAP_SIZE];
 } hashsig_heap;
 
-typedef struct {
-	hashsig_state state, shift_n;
-	char window[HASHSIG_HASH_WINDOW];
-	int win_len, win_pos, saw_lf;
-} hashsig_in_progress;
-
-#define HASHSIG_IN_PROGRESS_INIT { HASHSIG_HASH_START, 1, {0}, 0, 0, 1 }
-
 struct git_hashsig {
 	hashsig_heap mins;
 	hashsig_heap maxs;
@@ -115,142 +110,109 @@ static void hashsig_heap_sort(hashsig_heap *h)
 
 static void hashsig_heap_insert(hashsig_heap *h, hashsig_t val)
 {
-	/* if heap is full, pop top if new element should replace it */
-	if (h->size == h->asize && h->cmp(&val, &h->values[0], NULL) > 0) {
-		h->size--;
-		h->values[0] = h->values[h->size];
-		hashsig_heap_down(h, 0);
-	}
-
 	/* if heap is not full, insert new element */
 	if (h->size < h->asize) {
 		h->values[h->size++] = val;
 		hashsig_heap_up(h, h->size - 1);
 	}
-}
-
-GIT_INLINE(bool) hashsig_include_char(
-	char ch, git_hashsig_option_t opt, int *saw_lf)
-{
-	if ((opt & GIT_HASHSIG_IGNORE_WHITESPACE) && git__isspace(ch))
-		return false;
 
-	if (opt & GIT_HASHSIG_SMART_WHITESPACE) {
-		if (ch == '\r' || (*saw_lf && git__isspace(ch)))
-			return false;
-
-		*saw_lf = (ch == '\n');
+	/* if heap is full, pop top if new element should replace it */
+	else if (h->cmp(&val, &h->values[0], NULL) > 0) {
+		h->size--;
+		h->values[0] = h->values[h->size];
+		hashsig_heap_down(h, 0);
 	}
 
-	return true;
 }
 
-static void hashsig_initial_window(
-	git_hashsig *sig,
-	const char **data,
-	size_t size,
-	hashsig_in_progress *prog)
-{
-	hashsig_state state, shift_n;
-	int win_len, saw_lf = prog->saw_lf;
-	const char *scan, *end;
-	char *window = &prog->window[0];
-
-	/* init until we have processed at least HASHSIG_HASH_WINDOW data */
-
-	if (prog->win_len >= HASHSIG_HASH_WINDOW)
-		return;
-
-	state   = prog->state;
-	win_len = prog->win_len;
-	shift_n = prog->shift_n;
-
-	scan = *data;
-	end  = scan + size;
-
-	while (scan < end && win_len < HASHSIG_HASH_WINDOW) {
-		char ch = *scan++;
-
-		if (!hashsig_include_char(ch, sig->opt, &saw_lf))
-			continue;
-
-		state = (state * HASHSIG_HASH_SHIFT + ch) & HASHSIG_HASH_MASK;
-
-		if (!win_len)
-			shift_n = 1;
-		else
-			shift_n = (shift_n * HASHSIG_HASH_SHIFT) & HASHSIG_HASH_MASK;
-
-		window[win_len++] = ch;
-	}
+typedef struct {
+	int use_ignores;
+	uint8_t ignore_ch[256];
+} hashsig_in_progress;
 
-	/* insert initial hash if we just finished */
+static void hashsig_in_progress_init(
+	hashsig_in_progress *prog, git_hashsig *sig)
+{
+	int i;
 
-	if (win_len == HASHSIG_HASH_WINDOW) {
-		hashsig_heap_insert(&sig->mins, (hashsig_t)state);
-		hashsig_heap_insert(&sig->maxs, (hashsig_t)state);
-		sig->considered = 1;
+	switch (sig->opt) {
+	case GIT_HASHSIG_IGNORE_WHITESPACE:
+		for (i = 0; i < 256; ++i)
+			prog->ignore_ch[i] = git__isspace_nonlf(i);
+		prog->use_ignores = 1;
+		break;
+	case GIT_HASHSIG_SMART_WHITESPACE:
+		for (i = 0; i < 256; ++i)
+			prog->ignore_ch[i] = git__isspace(i);
+		prog->use_ignores = 1;
+		break;
+	default:
+		memset(prog, 0, sizeof(*prog));
+		break;
 	}
-
-	prog->state   = state;
-	prog->win_len = win_len;
-	prog->shift_n = shift_n;
-	prog->saw_lf  = saw_lf;
-
-	*data = scan;
 }
 
+#define HASHSIG_IN_PROGRESS_INIT { 1 }
+
 static int hashsig_add_hashes(
 	git_hashsig *sig,
-	const char *data,
+	const uint8_t *data,
 	size_t size,
 	hashsig_in_progress *prog)
 {
-	const char *scan = data, *end = data + size;
-	hashsig_state state, shift_n, rmv;
-	int win_pos, saw_lf;
-	char *window = &prog->window[0];
+	const uint8_t *scan = data, *end = data + size;
+	hashsig_state state = HASHSIG_HASH_START;
+	int use_ignores = prog->use_ignores, len;
+	uint8_t ch;
 
-	if (prog->win_len < HASHSIG_HASH_WINDOW)
-		hashsig_initial_window(sig, &scan, size, prog);
+	while (scan < end) {
+		state = HASHSIG_HASH_START;
 
-	state   = prog->state;
-	shift_n = prog->shift_n;
-	saw_lf  = prog->saw_lf;
-	win_pos = prog->win_pos;
+		for (len = 0; scan < end && len < HASHSIG_MAX_RUN; ) {
+			ch = *scan;
 
-	/* advance window, adding new chars and removing old */
+			if (use_ignores)
+				for (; scan < end && git__isspace_nonlf(ch); ch = *scan)
+					++scan;
+			else if (sig->opt != GIT_HASHSIG_NORMAL)
+				for (; scan < end && ch == '\r'; ch = *scan)
+					++scan;
 
-	for (; scan < end; ++scan) {
-		char ch = *scan;
+			/* peek at next character to decide what to do next */
+			if (sig->opt == GIT_HASHSIG_SMART_WHITESPACE)
+				use_ignores = (ch == '\n');
 
-		if (!hashsig_include_char(ch, sig->opt, &saw_lf))
-			continue;
+			if (scan >= end)
+				break;
+			++scan;
 
-		rmv = shift_n * window[win_pos];
+			/* check run terminator */
+			if (ch == '\n' || ch == '\0')
+				break;
 
-		state = (state - rmv) & HASHSIG_HASH_MASK;
-		state = (state * HASHSIG_HASH_SHIFT) & HASHSIG_HASH_MASK;
-		state = (state + ch) & HASHSIG_HASH_MASK;
+			++len;
+			HASHSIG_HASH_MIX(state, ch);
+		}
 
+		if (len > 0) {
 			hashsig_heap_insert(&sig->mins, (hashsig_t)state);
 			hashsig_heap_insert(&sig->maxs, (hashsig_t)state);
+
 			sig->considered++;
 
-		window[win_pos] = ch;
-		win_pos = (win_pos + 1) % HASHSIG_HASH_WINDOW;
+			while (scan < end && (*scan == '\n' || !*scan))
+				++scan;
+		}
 	}
 
-	prog->state   = state;
-	prog->saw_lf  = saw_lf;
-	prog->win_pos = win_pos;
+	prog->use_ignores = use_ignores;
 
 	return 0;
 }
 
 static int hashsig_finalize_hashes(git_hashsig *sig)
 {
-	if (sig->mins.size < HASHSIG_HEAP_SIZE) {
+	if (sig->mins.size < HASHSIG_HEAP_MIN_SIZE) {
 		giterr_set(GITERR_INVALID,
 			"File too small for similarity signature calculation");
 		return GIT_EBUFS;
@@ -282,11 +244,13 @@ int git_hashsig_create(
 	git_hashsig_option_t opts)
 {
 	int error;
-	hashsig_in_progress prog = HASHSIG_IN_PROGRESS_INIT;
+	hashsig_in_progress prog;
 	git_hashsig *sig = hashsig_alloc(opts);
 	GITERR_CHECK_ALLOC(sig);
 
-	error = hashsig_add_hashes(sig, buf, buflen, &prog);
+	hashsig_in_progress_init(&prog, sig);
+
+	error = hashsig_add_hashes(sig, (const uint8_t *)buf, buflen, &prog);
 
 	if (!error)
 		error = hashsig_finalize_hashes(sig);
@@ -304,10 +268,10 @@ int git_hashsig_create_fromfile(
 	const char *path,
 	git_hashsig_option_t opts)
 {
-	char buf[0x1000];
+	uint8_t buf[0x1000];
 	ssize_t buflen = 0;
 	int error = 0, fd;
-	hashsig_in_progress prog = HASHSIG_IN_PROGRESS_INIT;
+	hashsig_in_progress prog;
 	git_hashsig *sig = hashsig_alloc(opts);
 	GITERR_CHECK_ALLOC(sig);
 
@@ -316,6 +280,8 @@ int git_hashsig_create_fromfile(
 		return fd;
 	}
 
+	hashsig_in_progress_init(&prog, sig);
+
 	while (!error) {
 		if ((buflen = p_read(fd, buf, sizeof(buf))) <= 0) {
 			if ((error = (int)buflen) < 0)
@@ -370,6 +336,12 @@ static int hashsig_heap_compare(const hashsig_heap *a, const hashsig_heap *b)
 
 int git_hashsig_compare(const git_hashsig *a, const git_hashsig *b)
 {
+	/* if we have fewer than the maximum number of elements, then just use
+	 * one array since the two arrays will be the same
+	 */
+	if (a->mins.size < HASHSIG_HEAP_SIZE)
+		return hashsig_heap_compare(&a->mins, &b->mins);
+	else
 		return (hashsig_heap_compare(&a->mins, &b->mins) +
 				hashsig_heap_compare(&a->maxs, &b->maxs)) / 2;
 }

src/util.h

@@ -294,6 +294,11 @@ GIT_INLINE(bool) git__isspace(int c)
 	return (c == ' ' || c == '\t' || c == '\n' || c == '\f' || c == '\r' || c == '\v' || c == 0x85 /* Unicode CR+LF */);
 }
 
+GIT_INLINE(bool) git__isspace_nonlf(int c)
+{
+	return (c == ' ' || c == '\t' || c == '\f' || c == '\r' || c == '\v' || c == 0x85 /* Unicode CR+LF */);
+}
+
 GIT_INLINE(bool) git__iswildcard(int c)
 {
 	return (c == '*' || c == '?' || c == '[');

tests-clar/clar_libgit2.h

@@ -34,6 +34,20 @@ void cl_git_report_failure(int, const char *, int, const char *);
 
 #define cl_assert_equal_sz(sz1,sz2) cl_assert_equal_i((int)sz1, (int)(sz2))
 
+GIT_INLINE(void) clar__assert_in_range(
+	int lo, int val, int hi,
+	const char *file, int line, const char *err, int should_abort)
+{
+	if (lo > val || hi < val) {
+		char buf[128];
+		snprintf(buf, sizeof(buf), "%d not in [%d,%d]", val, lo, hi);
+		clar__fail(file, line, err, buf, should_abort);
+	}
+}
+
+#define cl_assert_in_range(L,V,H) \
+	clar__assert_in_range((L),(V),(H),__FILE__,__LINE__,"Range check: " #V " in [" #L "," #H "]", 1)
+
 /*
  * Some utility macros for building long strings
  */

tests-clar/core/buffer.c

@@ -734,10 +734,11 @@ void test_core_buffer__classify_with_utf8(void)
 }
 
 #define SIMILARITY_TEST_DATA_1 \
-	"test data\nright here\ninline\ntada\nneeds more data\nlots of data\n" \
-	"is this enough?\nthere has to be enough data to fill the hash array!\n" \
-	"Apparently 191 bytes is the minimum amount of data needed.\nHere goes!\n" \
-	"Let's make sure we've got plenty to go with here.\n   smile   \n"
+	"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
+	"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
+	"020\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
+	"030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
+	"040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"
 
 void test_core_buffer__similarity_metric(void)
 {
@@ -761,15 +762,17 @@ void test_core_buffer__similarity_metric(void)
 	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
 	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
 	cl_git_pass(git_buf_sets(&buf,
-		"Test data\nright here\ninline\ntada\nneeds more data\nlots of data\n"
-		"is this enough?\nthere has to be enough data to fill the hash array!\n"
-		"Apparently 191 bytes is the minimum amount of data needed.\nHere goes!\n"
-		 "Let's make sure we've got plenty to go with here.\n   smile   \n"));
+		"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
+		"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
+		"x020x\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
+		"030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
+		"040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"
+		));
 	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
 
 	sim = git_hashsig_compare(a, b);
 
-	cl_assert(95 < sim && sim < 100); /* expect >95% similarity */
+	cl_assert_in_range(95, sim, 100); /* expect >95% similarity */
 
 	git_hashsig_free(a);
 	git_hashsig_free(b);
@@ -779,12 +782,13 @@ void test_core_buffer__similarity_metric(void)
 	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
 	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
 	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1
-		"and if I add some more, it should still be pretty similar, yes?\n"));
+		"050\n051\n052\n053\n054\n055\n056\n057\n058\n059\n"));
 	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
 
 	sim = git_hashsig_compare(a, b);
+	/* 20% lines added ~= 10% lines changed */
 
-	cl_assert(70 < sim && sim < 80); /* expect in the 70-80% similarity range */
+	cl_assert_in_range(85, sim, 95); /* expect similarity around 90% */
 
 	git_hashsig_free(a);
 	git_hashsig_free(b);
@@ -794,15 +798,19 @@ void test_core_buffer__similarity_metric(void)
 	cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
 	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
 	cl_git_pass(git_buf_sets(&buf,
-		"test data\nright here\ninline\ntada\nneeds more data\nlots of data\n"
-		"is this enough?\nthere has to be enough data to fill the hash array!\n"
-		"okay, that's half the original\nwhat else can we add?\nmore data\n"
-		 "one more line will complete this\nshort\nlines\ndon't\nmatter\n"));
+		"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
+		"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
+		"020x\n021\n022\n023\n024\n" \
+		"x25\nx26\nx27\nx28\nx29\n" \
+		"x30\nx31\nx32\nx33\nx34\nx35\nx36\nx37\nx38\nx39\n" \
+		"x40\nx41\nx42\nx43\nx44\nx45\nx46\nx47\nx48\nx49\n"
+		));
 	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
 
 	sim = git_hashsig_compare(a, b);
+	/* 50% lines changed */
 
-	cl_assert(40 < sim && sim < 60); /* expect in the 40-60% similarity range */
+	cl_assert_in_range(40, sim, 60); /* expect in the 40-60% similarity range */
 
 	git_hashsig_free(a);
 	git_hashsig_free(b);
@@ -891,7 +899,7 @@ void test_core_buffer__similarity_metric_whitespace(void)
 					if (i == j)
 						cl_assert_equal_i(100, sim);
 					else
-						cl_assert(sim < 30); /* expect pretty different */
+						cl_assert_in_range(0, sim, 30); /* pretty different */
 				} else {
 					cl_assert_equal_i(100, sim);
 				}

tests-clar/diff/rename.c

@@ -236,6 +236,8 @@ void test_diff_rename__not_exact_match(void)
 		&diff, g_repo, old_tree, new_tree, &diffopts));
 
 	opts.flags = GIT_DIFF_FIND_ALL;
+	opts.break_rewrite_threshold = 70;
+
 	cl_git_pass(git_diff_find_similar(diff, &opts));
 
 	memset(&exp, 0, sizeof(exp));
@@ -312,8 +314,8 @@ void test_diff_rename__not_exact_match(void)
 
 	/* the default match algorithm is going to find the internal
 	 * whitespace differences in the lines of sixserving.txt to be
-	 * significant enough that this will decide to split it into
-	 * an ADD and a DELETE
+	 * significant enough that this will decide to split it into an ADD
+	 * and a DELETE
 	 */
 
 	memset(&exp, 0, sizeof(exp));
@@ -480,6 +482,7 @@ void test_diff_rename__working_directory_changes(void)
 	cl_git_pass(git_diff_tree_to_workdir(&diff, g_repo, tree, &diffopts));
 
 	opts.flags = GIT_DIFF_FIND_ALL | GIT_DIFF_FIND_DONT_IGNORE_WHITESPACE;
+	opts.rename_threshold = 70;
 	cl_git_pass(git_diff_find_similar(diff, &opts));
 
 	memset(&exp, 0, sizeof(exp));
@@ -1123,7 +1126,10 @@ void test_diff_rename__unmodified_can_be_renamed(void)
 	git_tree_free(tree);
 }
 
-void test_diff_rename__many_files(void)
+#define ANOTHER_POEM \
+"OH, glorious are the guarded heights\nWhere guardian souls abide—\nSelf-exiled from our gross delights—\nAbove, beyond, outside:\nAn ampler arc their spirit swings—\nCommands a juster view—\nWe have their word for all these things,\nNo doubt their words are true.\n\nYet we, the bond slaves of our day,\nWhom dirt and danger press—\nCo-heirs of insolence, delay,\nAnd leagued unfaithfulness—\nSuch is our need must seek indeed\nAnd, having found, engage\nThe men who merely do the work\nFor which they draw the wage.\n\nFrom forge and farm and mine and bench,\nDeck, altar, outpost lone—\nMill, school, battalion, counter, trench,\nRail, senate, sheepfold, throne—\nCreation's cry goes up on high\nFrom age to cheated age:\n\"Send us the men who do the work\n\"For which they draw the wage!\"\n"
+
+static void test_with_many(size_t expected_new)
 {
 	git_index *index;
 	git_tree *tree, *new_tree;
@@ -1131,9 +1137,6 @@ void test_diff_rename__many_files(void)
 	diff_expects exp;
 	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
 	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
-	git_buf b = GIT_BUF_INIT;
-	int i, j;
-	char tmp[64];
 
 	cl_git_pass(git_repository_index(&index, g_repo));
 	cl_git_pass(
@@ -1142,18 +1145,6 @@ void test_diff_rename__many_files(void)
 	cl_git_pass(p_rename("renames/ikeepsix.txt", "renames/ikeepsix2.txt"));
 	cl_git_pass(git_index_remove_bypath(index, "ikeepsix.txt"));
 	cl_git_pass(git_index_add_bypath(index, "ikeepsix2.txt"));
-
-	for (i = 0; i < 100; i += 2) {
-		snprintf(tmp, sizeof(tmp), "renames/newfile%03d", i);
-
-		for (j = 0; j < i * 128; ++j)
-			git_buf_printf(&b, "more content %d\n", i);
-
-		cl_git_mkfile(tmp, b.ptr);
-		cl_git_pass(git_index_add_bypath(index, tmp + strlen("renames/")));
-	}
-	git_buf_free(&b);
-
 	cl_git_pass(git_index_write(index));
 
 	cl_git_pass(git_diff_tree_to_index(&diff, g_repo, tree, index, &diffopts));
@@ -1162,8 +1153,8 @@ void test_diff_rename__many_files(void)
 	cl_git_pass(git_diff_foreach(
 		diff, diff_file_cb, NULL, NULL, &exp));
 	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
-	cl_assert_equal_i(51, exp.file_status[GIT_DELTA_ADDED]);
-	cl_assert_equal_i(52, exp.files);
+	cl_assert_equal_i(expected_new + 1, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(expected_new + 2, exp.files);
 
 	opts.flags = GIT_DIFF_FIND_ALL;
 	cl_git_pass(git_diff_find_similar(diff, &opts));
@@ -1172,8 +1163,8 @@ void test_diff_rename__many_files(void)
 	cl_git_pass(git_diff_foreach(
 		diff, diff_file_cb, NULL, NULL, &exp));
 	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
-	cl_assert_equal_i(50, exp.file_status[GIT_DELTA_ADDED]);
-	cl_assert_equal_i(51, exp.files);
+	cl_assert_equal_i(expected_new, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(expected_new + 1, exp.files);
 
 	git_diff_list_free(diff);
 
@@ -1206,8 +1197,8 @@ void test_diff_rename__many_files(void)
 	cl_git_pass(git_diff_foreach(
 		diff, diff_file_cb, NULL, NULL, &exp));
 	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
-	cl_assert_equal_i(51, exp.file_status[GIT_DELTA_ADDED]);
-	cl_assert_equal_i(52, exp.files);
+	cl_assert_equal_i(expected_new + 1, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(expected_new + 2, exp.files);
 
 	opts.flags = GIT_DIFF_FIND_ALL;
 	cl_git_pass(git_diff_find_similar(diff, &opts));
@@ -1216,8 +1207,8 @@ void test_diff_rename__many_files(void)
 	cl_git_pass(git_diff_foreach(
 		diff, diff_file_cb, NULL, NULL, &exp));
 	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
-	cl_assert_equal_i(50, exp.file_status[GIT_DELTA_ADDED]);
-	cl_assert_equal_i(51, exp.files);
+	cl_assert_equal_i(expected_new, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(expected_new + 1, exp.files);
 
 	git_diff_list_free(diff);
 
@@ -1225,3 +1216,59 @@ void test_diff_rename__many_files(void)
 	git_tree_free(tree);
 	git_index_free(index);
 }
+
+void test_diff_rename__many_files(void)
+{
+	git_index *index;
+	char tmp[64];
+	int i, j;
+	git_buf b = GIT_BUF_INIT;
+
+	cl_git_pass(git_repository_index(&index, g_repo));
+
+	for (i = 0; i < 100; i += 1) {
+		snprintf(tmp, sizeof(tmp), "renames/newfile%03d", i);
+		for (j = i * 256; j > 0; --j)
+			git_buf_printf(&b, "more content %d\n", i);
+		cl_git_mkfile(tmp, b.ptr);
+	}
+
+	for (i = 0; i < 100; i += 1) {
+		snprintf(tmp, sizeof(tmp), "renames/newfile%03d", i);
+		cl_git_pass(git_index_add_bypath(index, tmp + strlen("renames/")));
+	}
+
+	git_buf_free(&b);
+	git_index_free(index);
+
+	test_with_many(100);
+}
+
+void test_diff_rename__again_many_files(void)
+{
+	git_index *index;
+	char tmp[64];
+	int i;
+	git_buf b = GIT_BUF_INIT;
+
+	cl_git_pass(git_repository_index(&index, g_repo));
+
+	git_buf_printf(&b, "%08d\n" ANOTHER_POEM "%08d\n" ANOTHER_POEM ANOTHER_POEM, 0, 0);
+
+	for (i = 0; i < 2500; i += 1) {
+		snprintf(tmp, sizeof(tmp), "renames/newfile%03d", i);
+		snprintf(b.ptr, 9, "%08d", i);
+		b.ptr[8] = '\n';
+		cl_git_mkfile(tmp, b.ptr);
+	}
+	git_buf_free(&b);
+
+	for (i = 0; i < 2500; i += 1) {
+		snprintf(tmp, sizeof(tmp), "renames/newfile%03d", i);
+		cl_git_pass(git_index_add_bypath(index, tmp + strlen("renames/")));
+	}
+
+	git_index_free(index);
+
+	test_with_many(2500);
+}