[PATCH] Use ^=1 to toggle between 0 and 1

["AtariDreams via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Seija Kijin <doremylover123@xxxxxxxxx>

If it is known that an int is either 1 or 0,
doing an exclusive or to switch instead of a
modulus makes more sense and is more efficient.

Signed-off-by: Seija Kijin doremylover123@xxxxxxxxx
---
    Use ^=1 to toggle between 0 and 1
    
    If it is known that an int is either 1 or 0, doing an exclusive or to
    switch instead of a modulus makes more sense and is more efficient.
    
    Signed-off-by: Seija Kijin doremylover123@xxxxxxxxx

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1620%2FAtariDreams%2Fbuffer-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1620/AtariDreams/buffer-v1
Pull-Request: https://github.com/git/git/pull/1620

 builtin/fast-export.c      | 4 ++--
 diff.c                     | 2 +-
 ident.c                    | 2 +-
 t/helper/test-path-utils.c | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 70aff515acb..f9f2c9dd850 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -593,8 +593,8 @@ static void anonymize_ident_line(const char **beg, const char **end)
 	struct ident_split split;
 	const char *end_of_header;
 
-	out = &buffers[which_buffer++];
-	which_buffer %= ARRAY_SIZE(buffers);
+	out = &buffers[which_buffer];
+	which_buffer ^= 1;
 	strbuf_reset(out);
 
 	/* skip "committer", "author", "tagger", etc */
diff --git a/diff.c b/diff.c
index 2c602df10a3..91842b54753 100644
--- a/diff.c
+++ b/diff.c
@@ -1191,7 +1191,7 @@ static void mark_color_as_moved(struct diff_options *o,
 							    &pmb_nr);
 
 			if (contiguous && pmb_nr && moved_symbol == l->s)
-				flipped_block = (flipped_block + 1) % 2;
+				flipped_block ^= 1;
 			else
 				flipped_block = 0;
 
diff --git a/ident.c b/ident.c
index cc7afdbf819..188826eed63 100644
--- a/ident.c
+++ b/ident.c
@@ -459,7 +459,7 @@ const char *fmt_ident(const char *name, const char *email,
 	int want_name = !(flag & IDENT_NO_NAME);
 
 	struct strbuf *ident = &ident_pool[index];
-	index = (index + 1) % ARRAY_SIZE(ident_pool);
+	index ^= 1;
 
 	if (!email) {
 		if (whose_ident == WANT_AUTHOR_IDENT && git_author_email.len)
diff --git a/t/helper/test-path-utils.c b/t/helper/test-path-utils.c
index 70396fa3845..241136148a5 100644
--- a/t/helper/test-path-utils.c
+++ b/t/helper/test-path-utils.c
@@ -185,7 +185,7 @@ static int check_dotfile(const char *x, const char **argv,
 	int res = 0, expect = 1;
 	for (; *argv; argv++) {
 		if (!strcmp("--not", *argv))
-			expect = !expect;
+			expect ^= 1;
 		else if (expect != (is_hfs(*argv) || is_ntfs(*argv)))
 			res = error("'%s' is %s.git%s", *argv,
 				    expect ? "not " : "", x);

base-commit: 1a87c842ece327d03d08096395969aca5e0a6996
-- 
gitgitgadget