Merge branch 'jk/cocci'

spatch transformation to replace boolean uses of !hashcmp() to
newly introduced oideq() is added, and applied, to regain
performance lost due to support of multiple hash algorithms.

* jk/cocci:
  show_dirstat: simplify same-content check
  read-cache: use oideq() in ce_compare functions
  convert hashmap comparison functions to oideq()
  convert "hashcmp() != 0" to "!hasheq()"
  convert "oidcmp() != 0" to "!oideq()"
  convert "hashcmp() == 0" to hasheq()
  convert "oidcmp() == 0" to oideq()
  introduce hasheq() and oideq()
  coccinelle: use <...> for function exclusion

75 files changed, 258 insertions, 223 deletions

diff --git a/bisect.c b/bisect.c
index d023543c91..958e72c6b9 100644
--- a/bisect.c
+++ b/bisect.c
@@ -596,7 +596,7 @@ static struct commit_list *skip_away(struct commit_list *list, int count)
 
 	for (i = 0; cur; cur = cur->next, i++) {
 		if (i == index) {
-			if (oidcmp(&cur->item->object.oid, current_bad_oid))
+			if (!oideq(&cur->item->object.oid, current_bad_oid))
 				return cur;
 			if (previous)
 				return previous;
@@ -808,7 +808,7 @@ static void check_merge_bases(int rev_nr, struct commit **rev, int no_checkout)
 
 	for (; result; result = result->next) {
 		const struct object_id *mb = &result->item->object.oid;
-		if (!oidcmp(mb, current_bad_oid)) {
+		if (oideq(mb, current_bad_oid)) {
 			handle_bad_merge_base();
 		} else if (0 <= oid_array_lookup(&good_revs, mb)) {
 			continue;
@@ -989,7 +989,7 @@ int bisect_next_all(const char *prefix, int no_checkout)
 
 	bisect_rev = &revs.commits->item->object.oid;
 
-	if (!oidcmp(bisect_rev, current_bad_oid)) {
+	if (oideq(bisect_rev, current_bad_oid)) {
 		exit_if_skipped_commits(tried, current_bad_oid);
 		printf("%s is the first %s commit\n", oid_to_hex(bisect_rev),
 			term_bad);
diff --git a/blame.c b/blame.c
index aca06f4b12..d5f7b7237c 100644
--- a/blame.c
+++ b/blame.c
@@ -1457,14 +1457,14 @@ static void pass_blame(struct blame_scoreboard *sb, struct blame_origin *origin,
 			porigin = find(p, origin);
 			if (!porigin)
 				continue;
-			if (!oidcmp(&porigin->blob_oid, &origin->blob_oid)) {
+			if (oideq(&porigin->blob_oid, &origin->blob_oid)) {
 				pass_whole_blame(sb, origin, porigin);
 				blame_origin_decref(porigin);
 				goto finish;
 			}
 			for (j = same = 0; j < i; j++)
 				if (sg_origin[j] &&
-				    !oidcmp(&sg_origin[j]->blob_oid, &porigin->blob_oid)) {
+				    oideq(&sg_origin[j]->blob_oid, &porigin->blob_oid)) {
 					same = 1;
 					break;
 				}
@@ -1832,7 +1832,7 @@ void setup_scoreboard(struct blame_scoreboard *sb,
 
 		sb->revs->children.name = "children";
 		while (c->parents &&
-		       oidcmp(&c->object.oid, &sb->final->object.oid)) {
+		       !oideq(&c->object.oid, &sb->final->object.oid)) {
 			struct commit_list *l = xcalloc(1, sizeof(*l));
 
 			l->item = c;
@@ -1842,7 +1842,7 @@ void setup_scoreboard(struct blame_scoreboard *sb,
 			c = c->parents->item;
 		}
 
-		if (oidcmp(&c->object.oid, &sb->final->object.oid))
+		if (!oideq(&c->object.oid, &sb->final->object.oid))
 			die(_("--reverse --first-parent together require range along first-parent chain"));
 	}
 
diff --git a/builtin/am.c b/builtin/am.c
index 5e866d17c7..162a048bf7 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -2078,7 +2078,7 @@ static int safe_to_abort(const struct am_state *state)
 	if (get_oid("HEAD", &head))
 		oidclr(&head);
 
-	if (!oidcmp(&head, &abort_safety))
+	if (oideq(&head, &abort_safety))
 		return 1;
 
 	warning(_("You seem to have moved HEAD since the last 'am' failure.\n"
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 67a83fb95b..b30b48767e 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -102,7 +102,7 @@ static int update_some(const struct object_id *oid, struct strbuf *base,
 	if (pos >= 0) {
 		struct cache_entry *old = active_cache[pos];
 		if (ce->ce_mode == old->ce_mode &&
-		    !oidcmp(&ce->oid, &old->oid)) {
+		    oideq(&ce->oid, &old->oid)) {
 			old->ce_flags |= CE_UPDATE;
 			discard_cache_entry(ce);
 			return 0;
diff --git a/builtin/describe.c b/builtin/describe.c
index 41606c8a90..22c0541da5 100644
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -62,7 +62,7 @@ static const char *prio_names[] = {
 	N_("head"), N_("lightweight"), N_("annotated"),
 };
 
-static int commit_name_cmp(const void *unused_cmp_data,
+static int commit_name_neq(const void *unused_cmp_data,
 			   const void *entry,
 			   const void *entry_or_key,
 			   const void *peeled)
@@ -70,7 +70,7 @@ static int commit_name_cmp(const void *unused_cmp_data,
 	const struct commit_name *cn1 = entry;
 	const struct commit_name *cn2 = entry_or_key;
 
-	return oidcmp(&cn1->peeled, peeled ? peeled : &cn2->peeled);
+	return !oideq(&cn1->peeled, peeled ? peeled : &cn2->peeled);
 }
 
 static inline struct commit_name *find_commit_name(const struct object_id *peeled)
@@ -190,7 +190,7 @@ static int get_name(const char *path, const struct object_id *oid, int flag, voi
 
 	/* Is it annotated? */
 	if (!peel_ref(path, &peeled)) {
-		is_annotated = !!oidcmp(oid, &peeled);
+		is_annotated = !oideq(oid, &peeled);
 	} else {
 		oidcpy(&peeled, oid);
 		is_annotated = 0;
@@ -469,7 +469,7 @@ static void process_object(struct object *obj, const char *path, void *data)
 {
 	struct process_commit_data *pcd = data;
 
-	if (!oidcmp(&pcd->looking_for, &obj->oid) && !pcd->dst->len) {
+	if (oideq(&pcd->looking_for, &obj->oid) && !pcd->dst->len) {
 		reset_revision_walk();
 		describe_commit(&pcd->current_commit, pcd->dst);
 		strbuf_addf(pcd->dst, ":%s", path);
@@ -596,7 +596,7 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
 		return cmd_name_rev(args.argc, args.argv, prefix);
 	}
 
-	hashmap_init(&names, commit_name_cmp, NULL, 0);
+	hashmap_init(&names, commit_name_neq, NULL, 0);
 	for_each_rawref(get_name, NULL);
 	if (!hashmap_get_size(&names) && !always)
 		die(_("No names found, cannot describe anything."));
diff --git a/builtin/diff.c b/builtin/diff.c
index 361a3c3ed3..b3a8ba488f 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -41,7 +41,7 @@ static void stuff_change(struct diff_options *opt,
 	struct diff_filespec *one, *two;
 
 	if (!is_null_oid(old_oid) && !is_null_oid(new_oid) &&
-	    !oidcmp(old_oid, new_oid) && (old_mode == new_mode))
+	    oideq(old_oid, new_oid) && (old_mode == new_mode))
 		return;
 
 	if (opt->flags.reverse_diff) {
diff --git a/builtin/difftool.c b/builtin/difftool.c
index cdd585ca76..b41a9199ff 100644
--- a/builtin/difftool.c
+++ b/builtin/difftool.c
@@ -116,7 +116,7 @@ static int use_wt_file(const char *workdir, const char *name,
 			if (is_null_oid(oid)) {
 				oidcpy(oid, &wt_oid);
 				use = 1;
-			} else if (!oidcmp(oid, &wt_oid))
+			} else if (oideq(oid, &wt_oid))
 				use = 1;
 		}
 	}
@@ -438,7 +438,7 @@ static int run_dir_diff(const char *extcmd, int symlinks, const char *prefix,
 			strbuf_reset(&buf);
 			strbuf_addf(&buf, "Subproject commit %s",
 				    oid_to_hex(&roid));
-			if (!oidcmp(&loid, &roid))
+			if (oideq(&loid, &roid))
 				strbuf_addstr(&buf, "-dirty");
 			add_left_or_right(&submodules, dst_path, buf.buf, 1);
 			continue;
diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 9bd8a14b57..74f3bf5c96 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -384,7 +384,7 @@ static void show_filemodify(struct diff_queue_struct *q,
 				string_list_insert(changed, spec->path);
 				putchar('\n');
 
-				if (!oidcmp(&ospec->oid, &spec->oid) &&
+				if (oideq(&ospec->oid, &spec->oid) &&
 				    ospec->mode == spec->mode)
 					break;
 			}
diff --git a/builtin/fetch.c b/builtin/fetch.c
index eed15c7813..dc0931fb46 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -239,7 +239,7 @@ static int will_fetch(struct ref **head, const unsigned char *sha1)
 {
 	struct ref *rm = *head;
 	while (rm) {
-		if (!hashcmp(rm->old_oid.hash, sha1))
+		if (hasheq(rm->old_oid.hash, sha1))
 			return 1;
 		rm = rm->next;
 	}
@@ -508,7 +508,7 @@ static void adjust_refcol_width(const struct ref *ref)
 	int max, rlen, llen, len;
 
 	/* uptodate lines are only shown on high verbosity level */
-	if (!verbosity && !oidcmp(&ref->peer_ref->old_oid, &ref->old_oid))
+	if (!verbosity && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
 		return;
 
 	max    = term_columns();
@@ -645,7 +645,7 @@ static int update_local_ref(struct ref *ref,
 	if (type < 0)
 		die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 
-	if (!oidcmp(&ref->old_oid, &ref->new_oid)) {
+	if (oideq(&ref->old_oid, &ref->new_oid)) {
 		if (verbosity > 0)
 			format_display(display, '=', _("[up to date]"), NULL,
 				       remote, pretty_ref, summary_width);
diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index e5668f27d8..59a40342b6 100644
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -79,9 +79,9 @@ static struct merge_parent *find_merge_parent(struct merge_parents *table,
 {
 	int i;
 	for (i = 0; i < table->nr; i++) {
-		if (given && oidcmp(&table->item[i].given, given))
+		if (given && !oideq(&table->item[i].given, given))
 			continue;
-		if (commit && oidcmp(&table->item[i].commit, commit))
+		if (commit && !oideq(&table->item[i].commit, commit))
 			continue;
 		return &table->item[i];
 	}
@@ -583,7 +583,7 @@ static void find_merge_parents(struct merge_parents *result,
 	while (parents) {
 		struct commit *cmit = pop_commit(&parents);
 		for (i = 0; i < result->nr; i++)
-			if (!oidcmp(&result->item[i].commit, &cmit->object.oid))
+			if (oideq(&result->item[i].commit, &cmit->object.oid))
 				result->item[i].used = 1;
 	}
 
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 9582ead950..2004e25da2 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -719,9 +719,9 @@ static void find_ref_delta_children(const struct object_id *oid,
 		*last_index = -1;
 		return;
 	}
-	while (first > 0 && !oidcmp(&ref_deltas[first - 1].oid, oid))
+	while (first > 0 && oideq(&ref_deltas[first - 1].oid, oid))
 		--first;
-	while (last < end && !oidcmp(&ref_deltas[last + 1].oid, oid))
+	while (last < end && oideq(&ref_deltas[last + 1].oid, oid))
 		++last;
 	*first_index = first;
 	*last_index = last;
@@ -1166,7 +1166,7 @@ static void parse_pack_objects(unsigned char *hash)
 	/* Check pack integrity */
 	flush();
 	the_hash_algo->final_fn(hash, &input_ctx);
-	if (hashcmp(fill(the_hash_algo->rawsz), hash))
+	if (!hasheq(fill(the_hash_algo->rawsz), hash))
 		die(_("pack is corrupted (SHA1 mismatch)"));
 	use(the_hash_algo->rawsz);
 
@@ -1280,7 +1280,7 @@ static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned cha
 		fixup_pack_header_footer(output_fd, pack_hash,
 					 curr_pack, nr_objects,
 					 read_hash, consumed_bytes-the_hash_algo->rawsz);
-		if (hashcmp(read_hash, tail_hash) != 0)
+		if (!hasheq(read_hash, tail_hash))
 			die(_("Unexpected tail checksum for %s "
 			      "(disk corruption?)"), curr_pack);
 	}
diff --git a/builtin/log.c b/builtin/log.c
index f09a5789f8..1dbb9d829b 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -995,7 +995,7 @@ static char *find_branch_name(struct rev_info *rev)
 	tip_oid = &rev->cmdline.rev[positive].item->oid;
 	if (dwim_ref(ref, strlen(ref), &branch_oid, &full_ref) &&
 	    skip_prefix(full_ref, "refs/heads/", &v) &&
-	    !oidcmp(tip_oid, &branch_oid))
+	    oideq(tip_oid, &branch_oid))
 		branch = xstrdup(v);
 	free(full_ref);
 	return branch;
@@ -1764,7 +1764,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		/* Don't say anything if head and upstream are the same. */
 		if (rev.pending.nr == 2) {
 			struct object_array_entry *o = rev.pending.objects;
-			if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
+			if (oideq(&o[0].item->oid, &o[1].item->oid))
 				goto done;
 		}
 		get_patch_ids(&rev, &ids);
@@ -2049,7 +2049,7 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
 	/* Don't say anything if head and upstream are the same. */
 	if (revs.pending.nr == 2) {
 		struct object_array_entry *o = revs.pending.objects;
-		if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
+		if (oideq(&o[0].item->oid, &o[1].item->oid))
 			return 0;
 	}
 
diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
index f8023bae1e..8cea8a74f2 100644
--- a/builtin/merge-tree.c
+++ b/builtin/merge-tree.c
@@ -155,7 +155,7 @@ static int same_entry(struct name_entry *a, struct name_entry *b)
 {
 	return	a->oid &&
 		b->oid &&
-		!oidcmp(a->oid, b->oid) &&
+		oideq(a->oid, b->oid) &&
 		a->mode == b->mode;
 }
 
diff --git a/builtin/merge.c b/builtin/merge.c
index 7a8e3e274f..e331ca6d48 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1190,7 +1190,7 @@ static int merging_a_throwaway_tag(struct commit *commit)
 	tag_ref = xstrfmt("refs/tags/%s",
 			  ((struct tag *)merge_remote_util(commit)->obj)->tag);
 	if (!read_ref(tag_ref, &oid) &&
-	    !oidcmp(&oid, &merge_remote_util(commit)->obj->oid))
+	    oideq(&oid, &merge_remote_util(commit)->obj->oid))
 		is_throwaway_tag = 0;
 	else
 		is_throwaway_tag = 1;
@@ -1449,7 +1449,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 		goto done;
 	} else if (fast_forward != FF_NO && !remoteheads->next &&
 			!common->next &&
-			!oidcmp(&common->item->object.oid, &head_commit->object.oid)) {
+			oideq(&common->item->object.oid, &head_commit->object.oid)) {
 		/* Again the most common case of merging one remote. */
 		struct strbuf msg = STRBUF_INIT;
 		struct commit *commit;
@@ -1522,7 +1522,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 			 * HEAD^^" would be missed.
 			 */
 			common_one = get_merge_bases(head_commit, j->item);
-			if (oidcmp(&common_one->item->object.oid, &j->item->object.oid)) {
+			if (!oideq(&common_one->item->object.oid, &j->item->object.oid)) {
 				up_to_date = 0;
 				break;
 			}
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 425bdc8ac5..5041818ddf 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1248,7 +1248,7 @@ static struct pbase_tree_cache *pbase_tree_get(const struct object_id *oid)
 	 */
 	for (neigh = 0; neigh < 8; neigh++) {
 		ent = pbase_tree_cache[my_ix];
-		if (ent && !oidcmp(&ent->oid, oid)) {
+		if (ent && oideq(&ent->oid, oid)) {
 			ent->ref++;
 			return ent;
 		}
@@ -1430,7 +1430,7 @@ static void add_preferred_base(struct object_id *oid)
 		return;
 
 	for (it = pbase_tree; it; it = it->next) {
-		if (!oidcmp(&it->pcache.oid, &tree_oid)) {
+		if (oideq(&it->pcache.oid, &tree_oid)) {
 			free(data);
 			return;
 		}
diff --git a/builtin/pull.c b/builtin/pull.c
index 2514bfb9cd..b2055d1dd6 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -800,7 +800,7 @@ static int run_rebase(const struct object_id *curr_head,
 	struct argv_array args = ARGV_ARRAY_INIT;
 
 	if (!get_octopus_merge_base(&oct_merge_base, curr_head, merge_head, fork_point))
-		if (!is_null_oid(fork_point) && !oidcmp(&oct_merge_base, fork_point))
+		if (!is_null_oid(fork_point) && oideq(&oct_merge_base, fork_point))
 			fork_point = NULL;
 
 	argv_array_push(&args, "rebase");
@@ -903,7 +903,7 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 		oidclr(&curr_head);
 
 	if (!is_null_oid(&orig_head) && !is_null_oid(&curr_head) &&
-			oidcmp(&orig_head, &curr_head)) {
+			!oideq(&orig_head, &curr_head)) {
 		/*
 		 * The fetch involved updating the current branch.
 		 *
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 35a3fcfbd9..a3bb13af10 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -1223,8 +1223,8 @@ static void check_aliased_update(struct command *cmd, struct string_list *list)
 
 	dst_cmd = (struct command *) item->util;
 
-	if (!oidcmp(&cmd->old_oid, &dst_cmd->old_oid) &&
-	    !oidcmp(&cmd->new_oid, &dst_cmd->new_oid))
+	if (oideq(&cmd->old_oid, &dst_cmd->old_oid) &&
+	    oideq(&cmd->new_oid, &dst_cmd->new_oid))
 		return;
 
 	dst_cmd->skip_update = 1;
diff --git a/builtin/remote.c b/builtin/remote.c
index 61479bc428..40c6f8a1bd 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -413,7 +413,7 @@ static int get_push_ref_states(const struct ref *remote_refs,
 
 		if (is_null_oid(&ref->new_oid)) {
 			info->status = PUSH_STATUS_DELETE;
-		} else if (!oidcmp(&ref->old_oid, &ref->new_oid))
+		} else if (oideq(&ref->old_oid, &ref->new_oid))
 			info->status = PUSH_STATUS_UPTODATE;
 		else if (is_null_oid(&ref->old_oid))
 			info->status = PUSH_STATUS_CREATE;
diff --git a/builtin/replace.c b/builtin/replace.c
index 4f05791f3e..8e67e09819 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -343,7 +343,7 @@ static int edit_and_replace(const char *object_ref, int force, int raw)
 	}
 	free(tmpfile);
 
-	if (!oidcmp(&old_oid, &new_oid))
+	if (oideq(&old_oid, &new_oid))
 		return error(_("new object is the same as the old one: '%s'"), oid_to_hex(&old_oid));
 
 	return replace_object_oid(object_ref, &old_oid, "replacement", &new_oid, force);
@@ -414,7 +414,7 @@ static int check_one_mergetag(struct commit *commit,
 		if (get_oid(mergetag_data->argv[i], &oid) < 0)
 			return error(_("not a valid object name: '%s'"),
 				     mergetag_data->argv[i]);
-		if (!oidcmp(&tag->tagged->oid, &oid))
+		if (oideq(&tag->tagged->oid, &oid))
 			return 0; /* found */
 	}
 
@@ -474,7 +474,7 @@ static int create_graft(int argc, const char **argv, int force, int gentle)
 
 	strbuf_release(&buf);
 
-	if (!oidcmp(&old_oid, &new_oid)) {
+	if (oideq(&old_oid, &new_oid)) {
 		if (gentle) {
 			warning(_("graft for '%s' unnecessary"), oid_to_hex(&old_oid));
 			return 0;
diff --git a/builtin/rm.c b/builtin/rm.c
index 2cbe89e0ae..17086d3d97 100644
--- a/builtin/rm.c
+++ b/builtin/rm.c
@@ -180,7 +180,7 @@ static int check_local_mod(struct object_id *head, int index_only)
 		if (no_head
 		     || get_tree_entry(head, name, &oid, &mode)
 		     || ce->ce_mode != create_ce_mode(mode)
-		     || oidcmp(&ce->oid, &oid))
+		     || !oideq(&ce->oid, &oid))
 			staged_changes = 1;
 
 		/*
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index 363cf8509a..65f4a4c83c 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -412,7 +412,7 @@ static int append_head_ref(const char *refname, const struct object_id *oid,
 	/* If both heads/foo and tags/foo exists, get_sha1 would
 	 * get confused.
 	 */
-	if (get_oid(refname + ofs, &tmp) || oidcmp(&tmp, oid))
+	if (get_oid(refname + ofs, &tmp) || !oideq(&tmp, oid))
 		ofs = 5;
 	return append_ref(refname + ofs, oid, 0);
 }
@@ -427,7 +427,7 @@ static int append_remote_ref(const char *refname, const struct object_id *oid,
 	/* If both heads/foo and tags/foo exists, get_sha1 would
 	 * get confused.
 	 */
-	if (get_oid(refname + ofs, &tmp) || oidcmp(&tmp, oid))
+	if (get_oid(refname + ofs, &tmp) || !oideq(&tmp, oid))
 		ofs = 5;
 	return append_ref(refname + ofs, oid, 0);
 }
@@ -485,7 +485,7 @@ static void snarf_refs(int head, int remotes)
 static int rev_is_head(const char *head, const char *name,
 		       unsigned char *head_sha1, unsigned char *sha1)
 {
-	if (!head || (head_sha1 && sha1 && hashcmp(head_sha1, sha1)))
+	if (!head || (head_sha1 && sha1 && !hasheq(head_sha1, sha1)))
 		return 0;
 	skip_prefix(head, "refs/heads/", &head);
 	if (!skip_prefix(name, "refs/heads/", &name))
diff --git a/builtin/tag.c b/builtin/tag.c
index 9a19ffb49f..f623632186 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -559,7 +559,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 	    ref_transaction_commit(transaction, &err))
 		die("%s", err.buf);
 	ref_transaction_free(transaction);
-	if (force && !is_null_oid(&prev) && oidcmp(&prev, &object))
+	if (force && !is_null_oid(&prev) && !oideq(&prev, &object))
 		printf(_("Updated tag '%s' (was %s)\n"), tag,
 		       find_unique_abbrev(&prev, DEFAULT_ABBREV));
 
diff --git a/builtin/unpack-objects.c b/builtin/unpack-objects.c
index 30d9413b4b..80478808b3 100644
--- a/builtin/unpack-objects.c
+++ b/builtin/unpack-objects.c
@@ -303,7 +303,7 @@ static void added_object(unsigned nr, enum object_type type,
 	struct delta_info *info;
 
 	while ((info = *p) != NULL) {
-		if (!oidcmp(&info->base_oid, &obj_list[nr].oid) ||
+		if (oideq(&info->base_oid, &obj_list[nr].oid) ||
 		    info->base_offset == obj_list[nr].offset) {
 			*p = info->next;
 			p = &delta_list;
@@ -579,7 +579,7 @@ int cmd_unpack_objects(int argc, const char **argv, const char *prefix)
 		if (fsck_finish(&fsck_options))
 			die(_("fsck error in pack objects"));
 	}
-	if (hashcmp(fill(the_hash_algo->rawsz), oid.hash))
+	if (!hasheq(fill(the_hash_algo->rawsz), oid.hash))
 		die("final sha1 did not match");
 	use(the_hash_algo->rawsz);
 
diff --git a/builtin/update-index.c b/builtin/update-index.c
index fe84003b4f..e7fab78b3b 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -669,7 +669,7 @@ static int unresolve_one(const char *path)
 		ret = -1;
 		goto free_return;
 	}
-	if (!oidcmp(&ce_2->oid, &ce_3->oid) &&
+	if (oideq(&ce_2->oid, &ce_3->oid) &&
 	    ce_2->ce_mode == ce_3->ce_mode) {
 		fprintf(stderr, "%s: identical in both, skipping.\n",
 			path);
@@ -754,7 +754,7 @@ static int do_reupdate(int ac, const char **av,
 			old = read_one_ent(NULL, &head_oid,
 					   ce->name, ce_namelen(ce), 0);
 		if (old && ce->ce_mode == old->ce_mode &&
-		    !oidcmp(&ce->oid, &old->oid)) {
+		    oideq(&ce->oid, &old->oid)) {
 			discard_cache_entry(old);
 			continue; /* unchanged */
 		}
diff --git a/bulk-checkin.c b/bulk-checkin.c
index 9f3b644811..409ecb566b 100644
--- a/bulk-checkin.c
+++ b/bulk-checkin.c
@@ -72,7 +72,7 @@ static int already_written(struct bulk_checkin_state *state, struct object_id *o
 
 	/* Might want to keep the list sorted */
 	for (i = 0; i < state->nr_written; i++)
-		if (!oidcmp(&state->written[i]->oid, oid))
+		if (oideq(&state->written[i]->oid, oid))
 			return 1;
 
 	/* This is a new object we need to keep */
diff --git a/bundle.c b/bundle.c
index 24cbe40986..14f2cfc248 100644
--- a/bundle.c
+++ b/bundle.c
@@ -369,7 +369,7 @@ static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
 		 * commit that is referenced by the tag, and not the tag
 		 * itself.
 		 */
-		if (oidcmp(&oid, &e->item->oid)) {
+		if (!oideq(&oid, &e->item->oid)) {
 			/*
 			 * Is this the positive end of a range expressed
 			 * in terms of a tag (e.g. v2.0 from the range
diff --git a/cache-tree.c b/cache-tree.c
index 490a25adf0..5ce51468f0 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -717,7 +717,7 @@ int cache_tree_matches_traversal(struct cache_tree *root,
 
 	it = find_cache_tree_from_traversal(root, info);
 	it = cache_tree_find(it, ent->path);
-	if (it && it->entry_count > 0 && !oidcmp(ent->oid, &it->oid))
+	if (it && it->entry_count > 0 && oideq(ent->oid, &it->oid))
 		return it->entry_count;
 	return 0;
 }
diff --git a/cache.h b/cache.h
index b7166e45ed..d508f3d4f8 100644
--- a/cache.h
+++ b/cache.h
@@ -1041,14 +1041,24 @@ static inline int oidcmp(const struct object_id *oid1, const struct object_id *o
 	return hashcmp(oid1->hash, oid2->hash);
 }
 
+static inline int hasheq(const unsigned char *sha1, const unsigned char *sha2)
+{
+	return !hashcmp(sha1, sha2);
+}
+
+static inline int oideq(const struct object_id *oid1, const struct object_id *oid2)
+{
+	return hasheq(oid1->hash, oid2->hash);
+}
+
 static inline int is_null_sha1(const unsigned char *sha1)
 {
-	return !hashcmp(sha1, null_sha1);
+	return hasheq(sha1, null_sha1);
 }
 
 static inline int is_null_oid(const struct object_id *oid)
 {
-	return !hashcmp(oid->hash, null_sha1);
+	return hasheq(oid->hash, null_sha1);
 }
 
 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
@@ -1085,22 +1095,22 @@ static inline void oidread(struct object_id *oid, const unsigned char *hash)
 
 static inline int is_empty_blob_sha1(const unsigned char *sha1)
 {
-	return !hashcmp(sha1, the_hash_algo->empty_blob->hash);
+	return hasheq(sha1, the_hash_algo->empty_blob->hash);
 }
 
 static inline int is_empty_blob_oid(const struct object_id *oid)
 {
-	return !oidcmp(oid, the_hash_algo->empty_blob);
+	return oideq(oid, the_hash_algo->empty_blob);
 }
 
 static inline int is_empty_tree_sha1(const unsigned char *sha1)
 {
-	return !hashcmp(sha1, the_hash_algo->empty_tree->hash);
+	return hasheq(sha1, the_hash_algo->empty_tree->hash);
 }
 
 static inline int is_empty_tree_oid(const struct object_id *oid)
 {
-	return !oidcmp(oid, the_hash_algo->empty_tree);
+	return oideq(oid, the_hash_algo->empty_tree);
 }
 
 const char *empty_tree_oid_hex(void);
diff --git a/combine-diff.c b/combine-diff.c
index de7695e728..0fed4ca529 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -1138,8 +1138,8 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
 	for (i = 0; i < num_parent; i++) {
 		int j;
 		for (j = 0; j < i; j++) {
-			if (!oidcmp(&elem->parent[i].oid,
-				     &elem->parent[j].oid)) {
+			if (oideq(&elem->parent[i].oid,
+				  &elem->parent[j].oid)) {
 				reuse_combine_diff(sline, cnt, i, j);
 				break;
 			}
diff --git a/commit-graph.c b/commit-graph.c
index 0cad55eec2..ae6cabb4cd 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -783,7 +783,7 @@ void write_commit_graph(const char *obj_dir,
 
 	count_distinct = 1;
 	for (i = 1; i < oids.nr; i++) {
-		if (oidcmp(&oids.list[i-1], &oids.list[i]))
+		if (!oideq(&oids.list[i - 1], &oids.list[i]))
 			count_distinct++;
 	}
 
@@ -797,7 +797,7 @@ void write_commit_graph(const char *obj_dir,
 	num_extra_edges = 0;
 	for (i = 0; i < oids.nr; i++) {
 		int num_parents = 0;
-		if (i > 0 && !oidcmp(&oids.list[i-1], &oids.list[i]))
+		if (i > 0 && oideq(&oids.list[i - 1], &oids.list[i]))
 			continue;
 
 		commits.list[commits.nr] = lookup_commit(the_repository, &oids.list[i]);
@@ -918,7 +918,7 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g)
 	f = hashfd(devnull, NULL);
 	hashwrite(f, g->data, g->data_len - g->hash_len);
 	finalize_hashfile(f, checksum.hash, CSUM_CLOSE);
-	if (hashcmp(checksum.hash, g->data + g->data_len - g->hash_len)) {
+	if (!hasheq(checksum.hash, g->data + g->data_len - g->hash_len)) {
 		graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt"));
 		verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH;
 	}
@@ -978,7 +978,7 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g)
 			continue;
 		}
 
-		if (oidcmp(&get_commit_tree_in_graph_one(g, graph_commit)->object.oid,
+		if (!oideq(&get_commit_tree_in_graph_one(g, graph_commit)->object.oid,
 			   get_commit_tree_oid(odb_commit)))
 			graph_report("root tree OID for commit %s in commit-graph is %s != %s",
 				     oid_to_hex(&cur_oid),
@@ -995,7 +995,7 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g)
 				break;
 			}
 
-			if (oidcmp(&graph_parents->item->object.oid, &odb_parents->item->object.oid))
+			if (!oideq(&graph_parents->item->object.oid, &odb_parents->item->object.oid))
 				graph_report("commit-graph parent for %s is %s != %s",
 					     oid_to_hex(&cur_oid),
 					     oid_to_hex(&graph_parents->item->object.oid),
diff --git a/commit.c b/commit.c
index d6f7f5e4d2..d0f199e122 100644
--- a/commit.c
+++ b/commit.c
@@ -46,7 +46,7 @@ struct commit *lookup_commit_or_die(const struct object_id *oid, const char *ref
 	struct commit *c = lookup_commit_reference(the_repository, oid);
 	if (!c)
 		die(_("could not parse %s"), ref_name);
-	if (oidcmp(oid, &c->object.oid)) {
+	if (!oideq(oid, &c->object.oid)) {
 		warning(_("%s %s is not a commit!"),
 			ref_name, oid_to_hex(oid));
 	}
diff --git a/connect.c b/connect.c
index 94547e5056..24281b6082 100644
--- a/connect.c
+++ b/connect.c
@@ -224,7 +224,7 @@ static int process_dummy_ref(const char *line)
 		return 0;
 	name++;
 
-	return !oidcmp(&null_oid, &oid) && !strcmp(name, "capabilities^{}");
+	return oideq(&null_oid, &oid) && !strcmp(name, "capabilities^{}");
 }
 
 static void check_no_capabilities(const char *line, int len)
diff --git a/contrib/coccinelle/commit.cocci b/contrib/coccinelle/commit.cocci
index aec3345adb..c49aa558f0 100644
--- a/contrib/coccinelle/commit.cocci
+++ b/contrib/coccinelle/commit.cocci
@@ -15,10 +15,10 @@ expression c;
 identifier f !~ "^(get_commit_tree|get_commit_tree_in_graph_one|load_tree_for_commit)$";
 expression c;
 @@
-  f(...) {...
+  f(...) {<...
 - c->maybe_tree
 + get_commit_tree(c)
-  ...}
+  ...>}
 
 @@
 expression c;
diff --git a/contrib/coccinelle/object_id.cocci b/contrib/coccinelle/object_id.cocci
index 09afdbf994..d8bdb48712 100644
--- a/contrib/coccinelle/object_id.cocci
+++ b/contrib/coccinelle/object_id.cocci
@@ -20,10 +20,10 @@ expression E1;
 identifier f != oid_to_hex;
 expression E1;
 @@
-  f(...) {...
+  f(...) {<...
 - sha1_to_hex(E1->hash)
 + oid_to_hex(E1)
-  ...}
+  ...>}
 
 @@
 expression E1, E2;
@@ -35,10 +35,10 @@ expression E1, E2;
 identifier f != oid_to_hex_r;
 expression E1, E2;
 @@
-   f(...) {...
+   f(...) {<...
 - sha1_to_hex_r(E1, E2->hash)
 + oid_to_hex_r(E1, E2)
-  ...}
+  ...>}
 
 @@
 expression E1;
@@ -50,10 +50,10 @@ expression E1;
 identifier f != oidclr;
 expression E1;
 @@
-  f(...) {...
+  f(...) {<...
 - hashclr(E1->hash)
 + oidclr(E1)
-  ...}
+  ...>}
 
 @@
 expression E1, E2;
@@ -65,10 +65,10 @@ expression E1, E2;
 identifier f != oidcmp;
 expression E1, E2;
 @@
-  f(...) {...
+  f(...) {<...
 - hashcmp(E1->hash, E2->hash)
 + oidcmp(E1, E2)
-  ...}
+  ...>}
 
 @@
 expression E1, E2;
@@ -92,10 +92,10 @@ expression E1, E2;
 identifier f != oidcpy;
 expression E1, E2;
 @@
-  f(...) {...
+  f(...) {<...
 - hashcpy(E1->hash, E2->hash)
 + oidcpy(E1, E2)
-  ...}
+  ...>}
 
 @@
 expression E1, E2;
@@ -108,3 +108,33 @@ expression E1, E2;
 @@
 - hashcpy(E1.hash, E2->hash)
 + oidcpy(&E1, E2)
+
+@@
+expression E1, E2;
+@@
+- oidcmp(E1, E2) == 0
++ oideq(E1, E2)
+
+@@
+identifier f != hasheq;
+expression E1, E2;
+@@
+  f(...) {<...
+- hashcmp(E1, E2) == 0
++ hasheq(E1, E2)
+  ...>}
+
+@@
+expression E1, E2;
+@@
+- oidcmp(E1, E2) != 0
++ !oideq(E1, E2)
+
+@@
+identifier f != hasheq;
+expression E1, E2;
+@@
+  f(...) {<...
+- hashcmp(E1, E2) != 0
++ !hasheq(E1, E2)
+  ...>}
diff --git a/diff-lib.c b/diff-lib.c
index 70cddbf436..30bf9a2399 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -342,7 +342,7 @@ static int show_modified(struct rev_info *revs,
 	}
 
 	if (revs->combine_merges && !cached &&
-	    (oidcmp(oid, &old_entry->oid) || oidcmp(&old_entry->oid, &new_entry->oid))) {
+	    (!oideq(oid, &old_entry->oid) || !oideq(&old_entry->oid, &new_entry->oid))) {
 		struct combine_diff_path *p;
 		int pathlen = ce_namelen(new_entry);
 
@@ -366,7 +366,7 @@ static int show_modified(struct rev_info *revs,
 	}
 
 	oldmode = old_entry->ce_mode;
-	if (mode == oldmode && !oidcmp(oid, &old_entry->oid) && !dirty_submodule &&
+	if (mode == oldmode && oideq(oid, &old_entry->oid) && !dirty_submodule &&
 	    !revs->diffopt.flags.find_copies_harder)
 		return 0;
 
diff --git a/diff.c b/diff.c
index 0549fc6e2c..71ff247702 100644
--- a/diff.c
+++ b/diff.c
@@ -2948,16 +2948,11 @@ static void show_dirstat(struct diff_options *options)
 		struct diff_filepair *p = q->queue[i];
 		const char *name;
 		unsigned long copied, added, damage;
-		int content_changed;
 
 		name = p->two->path ? p->two->path : p->one->path;
 
-		if (p->one->oid_valid && p->two->oid_valid)
-			content_changed = oidcmp(&p->one->oid, &p->two->oid);
-		else
-			content_changed = 1;
-
-		if (!content_changed) {
+		if (p->one->oid_valid && p->two->oid_valid &&
+		    oideq(&p->one->oid, &p->two->oid)) {
 			/*
 			 * The SHA1 has not changed, so pre-/post-content is
 			 * identical. We can therefore skip looking at the
@@ -3004,7 +2999,7 @@ static void show_dirstat(struct diff_options *options)
 		 * made to the preimage.
 		 * If the resulting damage is zero, we know that
 		 * diffcore_count_changes() considers the two entries to
-		 * be identical, but since content_changed is true, we
+		 * be identical, but since the oid changed, we
 		 * know that there must have been _some_ kind of change,
 		 * so we force all entries to have damage > 0.
 		 */
@@ -3419,7 +3414,7 @@ static void builtin_diff(const char *name_a,
 		if (!one->data && !two->data &&
 		    S_ISREG(one->mode) && S_ISREG(two->mode) &&
 		    !o->flags.binary) {
-			if (!oidcmp(&one->oid, &two->oid)) {
+			if (oideq(&one->oid, &two->oid)) {
 				if (must_show_header)
 					emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
 							 header.buf, header.len,
@@ -3584,7 +3579,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
 		return;
 	}
 
-	same_contents = !oidcmp(&one->oid, &two->oid);
+	same_contents = oideq(&one->oid, &two->oid);
 
 	if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
 		data->is_binary = 1;
@@ -3780,7 +3775,7 @@ static int reuse_worktree_file(const char *name, const struct object_id *oid, in
 	 * This is not the sha1 we are looking for, or
 	 * unreusable because it is not a regular file.
 	 */
-	if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
+	if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
 		return 0;
 
 	/*
@@ -4185,7 +4180,7 @@ static void fill_metainfo(struct strbuf *msg,
 	default:
 		*must_show_header = 0;
 	}
-	if (one && two && oidcmp(&one->oid, &two->oid)) {
+	if (one && two && !oideq(&one->oid, &two->oid)) {
 		const unsigned hexsz = the_hash_algo->hexsz;
 		int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
 
@@ -5347,7 +5342,7 @@ int diff_unmodified_pair(struct diff_filepair *p)
 	 * dealing with a change.
 	 */
 	if (one->oid_valid && two->oid_valid &&
-	    !oidcmp(&one->oid, &two->oid) &&
+	    oideq(&one->oid, &two->oid) &&
 	    !one->dirty_submodule && !two->dirty_submodule)
 		return 1; /* no change */
 	if (!one->oid_valid && !two->oid_valid)
@@ -5481,7 +5476,7 @@ static void diff_resolve_rename_copy(void)
 			else
 				p->status = DIFF_STATUS_RENAMED;
 		}
-		else if (oidcmp(&p->one->oid, &p->two->oid) ||
+		else if (!oideq(&p->one->oid, &p->two->oid) ||
 			 p->one->mode != p->two->mode ||
 			 p->one->dirty_submodule ||
 			 p->two->dirty_submodule ||
diff --git a/diffcore-break.c b/diffcore-break.c
index c64359f489..e11fcfdb39 100644
--- a/diffcore-break.c
+++ b/diffcore-break.c
@@ -58,7 +58,7 @@ static int should_break(struct diff_filespec *src,
 	}
 
 	if (src->oid_valid && dst->oid_valid &&
-	    !oidcmp(&src->oid, &dst->oid))
+	    oideq(&src->oid, &dst->oid))
 		return 0; /* they are the same */
 
 	if (diff_populate_filespec(src, 0) || diff_populate_filespec(dst, 0))
diff --git a/diffcore-rename.c b/diffcore-rename.c
index d775183c2f..daddd9b28a 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -286,7 +286,7 @@ static int find_identical_files(struct hashmap *srcs,
 		struct diff_filespec *source = p->filespec;
 
 		/* False hash collision? */
-		if (oidcmp(&source->oid, &target->oid))
+		if (!oideq(&source->oid, &target->oid))
 			continue;
 		/* Non-regular files? If so, the modes must match! */
 		if (!S_ISREG(source->mode) || !S_ISREG(target->mode)) {
diff --git a/dir.c b/dir.c
index 995b8e3261..47c2fca8dc 100644
--- a/dir.c
+++ b/dir.c
@@ -1282,7 +1282,7 @@ static void prep_exclude(struct dir_struct *dir,
 		 * order, though, if you do that.
 		 */
 		if (untracked &&
-		    oidcmp(&oid_stat.oid, &untracked->exclude_oid)) {
+		    !oideq(&oid_stat.oid, &untracked->exclude_oid)) {
 			invalidate_gitignore(dir->untracked, untracked);
 			oidcpy(&untracked->exclude_oid, &oid_stat.oid);
 		}
@@ -2248,12 +2248,12 @@ static struct untracked_cache_dir *validate_untracked_cache(struct dir_struct *d
 
 	/* Validate $GIT_DIR/info/exclude and core.excludesfile */
 	root = dir->untracked->root;
-	if (oidcmp(&dir->ss_info_exclude.oid,
+	if (!oideq(&dir->ss_info_exclude.oid,
 		   &dir->untracked->ss_info_exclude.oid)) {
 		invalidate_gitignore(dir->untracked, root);
 		dir->untracked->ss_info_exclude = dir->ss_info_exclude;
 	}
-	if (oidcmp(&dir->ss_excludes_file.oid,
+	if (!oideq(&dir->ss_excludes_file.oid,
 		   &dir->untracked->ss_excludes_file.oid)) {
 		invalidate_gitignore(dir->untracked, root);
 		dir->untracked->ss_excludes_file = dir->ss_excludes_file;
diff --git a/fast-import.c b/fast-import.c
index af6514fdea..95600c78e0 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -573,7 +573,7 @@ static struct object_entry *find_object(struct object_id *oid)
 	unsigned int h = oid->hash[0] << 8 | oid->hash[1];
 	struct object_entry *e;
 	for (e = object_table[h]; e; e = e->next)
-		if (!oidcmp(oid, &e->idx.oid))
+		if (oideq(oid, &e->idx.oid))
 			return e;
 	return NULL;
 }
@@ -584,7 +584,7 @@ static struct object_entry *insert_object(struct object_id *oid)
 	struct object_entry *e = object_table[h];
 
 	while (e) {
-		if (!oidcmp(oid, &e->idx.oid))
+		if (oideq(oid, &e->idx.oid))
 			return e;
 		e = e->next;
 	}
@@ -1534,7 +1534,7 @@ static int tree_content_set(
 			if (!*slash1) {
 				if (!S_ISDIR(mode)
 						&& e->versions[1].mode == mode
-						&& !oidcmp(&e->versions[1].oid, oid))
+						&& oideq(&e->versions[1].oid, oid))
 					return 0;
 				e->versions[1].mode = mode;
 				oidcpy(&e->versions[1].oid, oid);
@@ -2650,7 +2650,7 @@ static int parse_from(struct branch *b)
 		struct object_entry *oe = find_mark(idnum);
 		if (oe->type != OBJ_COMMIT)
 			die("Mark :%" PRIuMAX " not a commit", idnum);
-		if (oidcmp(&b->oid, &oe->idx.oid)) {
+		if (!oideq(&b->oid, &oe->idx.oid)) {
 			oidcpy(&b->oid, &oe->idx.oid);
 			if (oe->pack_id != MAX_PACK_ID) {
 				unsigned long size;
@@ -2668,7 +2668,7 @@ static int parse_from(struct branch *b)
 	else
 		die("Invalid ref name or SHA1 expression: %s", from);
 
-	if (b->branch_tree.tree && oidcmp(&oid, &b->branch_tree.versions[1].oid)) {
+	if (b->branch_tree.tree && !oideq(&oid, &b->branch_tree.versions[1].oid)) {
 		release_tree_content_recursive(b->branch_tree.tree);
 		b->branch_tree.tree = NULL;
 	}
diff --git a/fetch-pack.c b/fetch-pack.c
index 88a078e9be..75047a4b2a 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -599,7 +599,7 @@ static void filter_refs(struct fetch_pack_args *args,
 			continue;
 		if (parse_oid_hex(ref->name, &oid, &p) ||
 		    *p != '\0' ||
-		    oidcmp(&oid, &ref->old_oid))
+		    !oideq(&oid, &ref->old_oid))
 			continue;
 
 		if ((allow_unadvertised_object_request &
diff --git a/http-push.c b/http-push.c
index 91fdc7e1d5..1bbb0cdb6d 100644
--- a/http-push.c
+++ b/http-push.c
@@ -1859,7 +1859,7 @@ int cmd_main(int argc, const char **argv)
 			continue;
 		}
 
-		if (!oidcmp(&ref->old_oid, &ref->peer_ref->new_oid)) {
+		if (oideq(&ref->old_oid, &ref->peer_ref->new_oid)) {
 			if (push_verbosely)
 				fprintf(stderr, "'%s': up-to-date\n", ref->name);
 			if (helper_status)
diff --git a/http-walker.c b/http-walker.c
index 7cdfb2f24c..b3334bf657 100644
--- a/http-walker.c
+++ b/http-walker.c
@@ -483,7 +483,7 @@ static int fetch_object(struct walker *walker, unsigned char *sha1)
 
 	list_for_each(pos, head) {
 		obj_req = list_entry(pos, struct object_request, node);
-		if (!hashcmp(obj_req->oid.hash, sha1))
+		if (hasheq(obj_req->oid.hash, sha1))
 			break;
 	}
 	if (obj_req == NULL)
@@ -543,7 +543,7 @@ static int fetch_object(struct walker *walker, unsigned char *sha1)
 	} else if (req->zret != Z_STREAM_END) {
 		walker->corrupt_object_found++;
 		ret = error("File %s (%s) corrupt", hex, req->url);
-	} else if (hashcmp(obj_req->oid.hash, req->real_sha1)) {
+	} else if (!hasheq(obj_req->oid.hash, req->real_sha1)) {
 		ret = error("File %s has bad hash", hex);
 	} else if (req->rename < 0) {
 		struct strbuf buf = STRBUF_INIT;
diff --git a/http.c b/http.c
index 4162860ee3..98ff122585 100644
--- a/http.c
+++ b/http.c
@@ -2394,7 +2394,7 @@ int finish_http_object_request(struct http_object_request *freq)
 		unlink_or_warn(freq->tmpfile.buf);
 		return -1;
 	}
-	if (hashcmp(freq->sha1, freq->real_sha1)) {
+	if (!hasheq(freq->sha1, freq->real_sha1)) {
 		unlink_or_warn(freq->tmpfile.buf);
 		return -1;
 	}
diff --git a/log-tree.c b/log-tree.c
index e5b353ea2d..7a83e99250 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -474,7 +474,7 @@ static int which_parent(const struct object_id *oid, const struct commit *commit
 	const struct commit_list *parent;
 
 	for (nth = 0, parent = commit->parents; parent; parent = parent->next) {
-		if (!oidcmp(&parent->item->object.oid, oid))
+		if (oideq(&parent->item->object.oid, oid))
 			return nth;
 		nth++;
 	}
@@ -508,8 +508,8 @@ static int show_one_mergetag(struct commit *commit,
 	if (parse_tag_buffer(the_repository, tag, extra->value, extra->len))
 		strbuf_addstr(&verify_message, "malformed mergetag\n");
 	else if (is_common_merge(commit) &&
-		 !oidcmp(&tag->tagged->oid,
-			  &commit->parents->next->item->object.oid))
+		 oideq(&tag->tagged->oid,
+		       &commit->parents->next->item->object.oid))
 		strbuf_addf(&verify_message,
 			    "merged tag '%s'\n", tag->tag);
 	else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
diff --git a/match-trees.c b/match-trees.c
index 37653308d3..2b6d31ef9d 100644
--- a/match-trees.c
+++ b/match-trees.c
@@ -106,7 +106,7 @@ static int score_trees(const struct object_id *hash1, const struct object_id *ha
 			update_tree_entry(&two);
 		} else {
 			/* path appears in both */
-			if (oidcmp(one.entry.oid, two.entry.oid)) {
+			if (!oideq(one.entry.oid, two.entry.oid)) {
 				/* they are different */
 				score += score_differs(one.entry.mode,
 						       two.entry.mode,
diff --git a/merge-recursive.c b/merge-recursive.c
index d9d78ec383..45a163c555 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -157,7 +157,7 @@ static struct tree *shift_tree_object(struct tree *one, struct tree *two,
 		shift_tree_by(&one->object.oid, &two->object.oid, &shifted,
 			      subtree_shift);
 	}
-	if (!oidcmp(&two->object.oid, &shifted))
+	if (oideq(&two->object.oid, &shifted))
 		return two;
 	return lookup_tree(the_repository, &shifted);
 }
@@ -180,7 +180,7 @@ static int oid_eq(const struct object_id *a, const struct object_id *b)
 {
 	if (!a && !b)
 		return 2;
-	return a && b && oidcmp(a, b) == 0;
+	return a && b && oideq(a, b);
 }
 
 enum rename_type {
diff --git a/notes-merge.c b/notes-merge.c
index 12dfdf6c17..5764e2b0ef 100644
--- a/notes-merge.c
+++ b/notes-merge.c
@@ -152,7 +152,7 @@ static struct notes_merge_pair *diff_tree_remote(struct notes_merge_options *o,
 		mp = find_notes_merge_pair_pos(changes, len, &obj, 1, &occupied);
 		if (occupied) {
 			/* We've found an addition/deletion pair */
-			assert(!oidcmp(&mp->obj, &obj));
+			assert(oideq(&mp->obj, &obj));
 			if (is_null_oid(&p->one->oid)) { /* addition */
 				assert(is_null_oid(&mp->remote));
 				oidcpy(&mp->remote, &p->two->oid);
@@ -219,7 +219,7 @@ static void diff_tree_local(struct notes_merge_options *o,
 			continue;
 		}
 
-		assert(!oidcmp(&mp->obj, &obj));
+		assert(oideq(&mp->obj, &obj));
 		if (is_null_oid(&p->two->oid)) { /* deletion */
 			/*
 			 * Either this is a true deletion (1), or it is part
@@ -230,7 +230,7 @@ static void diff_tree_local(struct notes_merge_options *o,
 			 * (3) mp->local is uninitialized; set it to null_sha1
 			 *     (will be overwritten by following addition)
 			 */
-			if (!oidcmp(&mp->local, &uninitialized))
+			if (oideq(&mp->local, &uninitialized))
 				oidclr(&mp->local);
 		} else if (is_null_oid(&p->one->oid)) { /* addition */
 			/*
@@ -242,7 +242,7 @@ static void diff_tree_local(struct notes_merge_options *o,
 			 * (3) mp->local is null_sha1;     set to p->two->sha1
 			 */
 			assert(is_null_oid(&mp->local) ||
-			       !oidcmp(&mp->local, &uninitialized));
+			       oideq(&mp->local, &uninitialized));
 			oidcpy(&mp->local, &p->two->oid);
 		} else { /* modification */
 			/*
@@ -250,8 +250,8 @@ static void diff_tree_local(struct notes_merge_options *o,
 			 * match mp->base, and mp->local shall be uninitialized.
 			 * Set mp->local to p->two->sha1.
 			 */
-			assert(!oidcmp(&p->one->oid, &mp->base));
-			assert(!oidcmp(&mp->local, &uninitialized));
+			assert(oideq(&p->one->oid, &mp->base));
+			assert(oideq(&mp->local, &uninitialized));
 			oidcpy(&mp->local, &p->two->oid);
 		}
 		trace_printf("\t\tStored local change for %s: %.7s -> %.7s\n",
@@ -481,14 +481,14 @@ static int merge_changes(struct notes_merge_options *o,
 		       oid_to_hex(&p->local),
 		       oid_to_hex(&p->remote));
 
-		if (!oidcmp(&p->base, &p->remote)) {
+		if (oideq(&p->base, &p->remote)) {
 			/* no remote change; nothing to do */
 			trace_printf("\t\t\tskipping (no remote change)\n");
-		} else if (!oidcmp(&p->local, &p->remote)) {
+		} else if (oideq(&p->local, &p->remote)) {
 			/* same change in local and remote; nothing to do */
 			trace_printf("\t\t\tskipping (local == remote)\n");
-		} else if (!oidcmp(&p->local, &uninitialized) ||
-			   !oidcmp(&p->local, &p->base)) {
+		} else if (oideq(&p->local, &uninitialized) ||
+			   oideq(&p->local, &p->base)) {
 			/* no local change; adopt remote change */
 			trace_printf("\t\t\tno local change, adopted remote\n");
 			if (add_note(t, &p->obj, &p->remote,
@@ -622,14 +622,14 @@ int notes_merge(struct notes_merge_options *o,
 			oid_to_hex(&local->object.oid),
 			oid_to_hex(base_oid));
 
-	if (!oidcmp(&remote->object.oid, base_oid)) {
+	if (oideq(&remote->object.oid, base_oid)) {
 		/* Already merged; result == local commit */
 		if (o->verbosity >= 2)
 			printf("Already up to date!\n");
 		oidcpy(result_oid, &local->object.oid);
 		goto found_result;
 	}
-	if (!oidcmp(&local->object.oid, base_oid)) {
+	if (oideq(&local->object.oid, base_oid)) {
 		/* Fast-forward; result == remote commit */
 		if (o->verbosity >= 2)
 			printf("Fast-forward\n");
diff --git a/notes.c b/notes.c
index 32d3dbcc1e..25cdce28b7 100644
--- a/notes.c
+++ b/notes.c
@@ -147,7 +147,7 @@ static struct leaf_node *note_tree_find(struct notes_tree *t,
 	void **p = note_tree_search(t, &tree, &n, key_sha1);
 	if (GET_PTR_TYPE(*p) == PTR_TYPE_NOTE) {
 		struct leaf_node *l = (struct leaf_node *) CLR_PTR_TYPE(*p);
-		if (!hashcmp(key_sha1, l->key_oid.hash))
+		if (hasheq(key_sha1, l->key_oid.hash))
 			return l;
 	}
 	return NULL;
@@ -206,7 +206,7 @@ static void note_tree_remove(struct notes_tree *t,
 	if (GET_PTR_TYPE(*p) != PTR_TYPE_NOTE)
 		return; /* type mismatch, nothing to remove */
 	l = (struct leaf_node *) CLR_PTR_TYPE(*p);
-	if (oidcmp(&l->key_oid, &entry->key_oid))
+	if (!oideq(&l->key_oid, &entry->key_oid))
 		return; /* key mismatch, nothing to remove */
 
 	/* we have found a matching entry */
@@ -266,9 +266,9 @@ static int note_tree_insert(struct notes_tree *t, struct int_node *tree,
 	case PTR_TYPE_NOTE:
 		switch (type) {
 		case PTR_TYPE_NOTE:
-			if (!oidcmp(&l->key_oid, &entry->key_oid)) {
+			if (oideq(&l->key_oid, &entry->key_oid)) {
 				/* skip concatenation if l == entry */
-				if (!oidcmp(&l->val_oid, &entry->val_oid))
+				if (oideq(&l->val_oid, &entry->val_oid))
 					return 0;
 
 				ret = combine_notes(&l->val_oid,
diff --git a/object.c b/object.c
index 51c4594515..e54160550c 100644
--- a/object.c
+++ b/object.c
@@ -95,7 +95,7 @@ struct object *lookup_object(struct repository *r, const unsigned char *sha1)
 
 	first = i = hash_obj(sha1, r->parsed_objects->obj_hash_size);
 	while ((obj = r->parsed_objects->obj_hash[i]) != NULL) {
-		if (!hashcmp(sha1, obj->oid.hash))
+		if (hasheq(sha1, obj->oid.hash))
 			break;
 		i++;
 		if (i == r->parsed_objects->obj_hash_size)
diff --git a/oidmap.c b/oidmap.c
index d9fb19ba6a..b0841a0f58 100644
--- a/oidmap.c
+++ b/oidmap.c
@@ -1,14 +1,14 @@
 #include "cache.h"
 #include "oidmap.h"
 
-static int cmpfn(const void *hashmap_cmp_fn_data,
-		 const void *entry, const void *entry_or_key,
-		 const void *keydata)
+static int oidmap_neq(const void *hashmap_cmp_fn_data,
+		      const void *entry, const void *entry_or_key,
+		      const void *keydata)
 {
 	const struct oidmap_entry *entry_ = entry;
 	if (keydata)
-		return oidcmp(&entry_->oid, (const struct object_id *) keydata);
-	return oidcmp(&entry_->oid,
+		return !oideq(&entry_->oid, (const struct object_id *) keydata);
+	return !oideq(&entry_->oid,
 		      &((const struct oidmap_entry *) entry_or_key)->oid);
 }
 
@@ -21,7 +21,7 @@ static int hash(const struct object_id *oid)
 
 void oidmap_init(struct oidmap *map, size_t initial_size)
 {
-	hashmap_init(&map->map, cmpfn, NULL, initial_size);
+	hashmap_init(&map->map, oidmap_neq, NULL, initial_size);
 }
 
 void oidmap_free(struct oidmap *map, int free_entries)
diff --git a/pack-check.c b/pack-check.c
index d3a57df34f..fa5f0ff8fa 100644
--- a/pack-check.c
+++ b/pack-check.c
@@ -79,10 +79,10 @@ static int verify_packfile(struct packed_git *p,
 	} while (offset < pack_sig_ofs);
 	the_hash_algo->final_fn(hash, &ctx);
 	pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
-	if (hashcmp(hash, pack_sig))
+	if (!hasheq(hash, pack_sig))
 		err = error("%s pack checksum mismatch",
 			    p->pack_name);
-	if (hashcmp(index_base + index_size - the_hash_algo->hexsz, pack_sig))
+	if (!hasheq(index_base + index_size - the_hash_algo->hexsz, pack_sig))
 		err = error("%s pack checksum does not match its index",
 			    p->pack_name);
 	unuse_pack(w_curs);
@@ -180,7 +180,7 @@ int verify_pack_index(struct packed_git *p)
 	the_hash_algo->init_fn(&ctx);
 	the_hash_algo->update_fn(&ctx, index_base, (unsigned int)(index_size - the_hash_algo->rawsz));
 	the_hash_algo->final_fn(hash, &ctx);
-	if (hashcmp(hash, index_base + index_size - the_hash_algo->rawsz))
+	if (!hasheq(hash, index_base + index_size - the_hash_algo->rawsz))
 		err = error("Packfile index for %s hash mismatch",
 			    p->pack_name);
 	return err;
diff --git a/pack-objects.c b/pack-objects.c
index 7f7b7dddf6..7e624c30eb 100644
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -16,7 +16,7 @@ static uint32_t locate_object_entry_hash(struct packing_data *pdata,
 	while (pdata->index[i] > 0) {
 		uint32_t pos = pdata->index[i] - 1;
 
-		if (!hashcmp(sha1, pdata->objects[pos].idx.oid.hash)) {
+		if (hasheq(sha1, pdata->objects[pos].idx.oid.hash)) {
 			*found = 1;
 			return i;
 		}
diff --git a/pack-write.c b/pack-write.c
index a9d46bc03f..29d17a9bec 100644
--- a/pack-write.c
+++ b/pack-write.c
@@ -124,7 +124,7 @@ const char *write_idx_file(const char *index_name, struct pack_idx_entry **objec
 		}
 		hashwrite(f, obj->oid.hash, the_hash_algo->rawsz);
 		if ((opts->flags & WRITE_IDX_STRICT) &&
-		    (i && !oidcmp(&list[-2]->oid, &obj->oid)))
+		    (i && oideq(&list[-2]->oid, &obj->oid)))
 			die("The same object %s appears twice in the pack",
 			    oid_to_hex(&obj->oid));
 	}
@@ -260,7 +260,7 @@ void fixup_pack_header_footer(int pack_fd,
 		if (partial_pack_offset == 0) {
 			unsigned char hash[GIT_MAX_RAWSZ];
 			the_hash_algo->final_fn(hash, &old_hash_ctx);
-			if (hashcmp(hash, partial_pack_hash) != 0)
+			if (!hasheq(hash, partial_pack_hash))
 				die("Unexpected checksum for %s "
 				    "(disk corruption?)", pack_name);
 			/*
diff --git a/packfile.c b/packfile.c
index cbef7033c3..841b36182f 100644
--- a/packfile.c
+++ b/packfile.c
@@ -550,7 +550,7 @@ static int open_packed_git_1(struct packed_git *p)
 	if (read_result != hashsz)
 		return error("packfile %s signature is unavailable", p->pack_name);
 	idx_hash = ((unsigned char *)p->index_data) + p->index_size - hashsz * 2;
-	if (hashcmp(hash, idx_hash))
+	if (!hasheq(hash, idx_hash))
 		return error("packfile %s does not match index", p->pack_name);
 	return 0;
 }
@@ -1122,7 +1122,7 @@ void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1)
 {
 	unsigned i;
 	for (i = 0; i < p->num_bad_objects; i++)
-		if (!hashcmp(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i))
+		if (hasheq(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i))
 			return;
 	p->bad_object_sha1 = xrealloc(p->bad_object_sha1,
 				      st_mult(GIT_MAX_RAWSZ,
@@ -1138,8 +1138,8 @@ const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
 
 	for (p = the_repository->objects->packed_git; p; p = p->next)
 		for (i = 0; i < p->num_bad_objects; i++)
-			if (!hashcmp(sha1,
-				     p->bad_object_sha1 + the_hash_algo->rawsz * i))
+			if (hasheq(sha1,
+				   p->bad_object_sha1 + the_hash_algo->rawsz * i))
 				return p;
 	return NULL;
 }
@@ -1937,8 +1937,8 @@ static int fill_pack_entry(const struct object_id *oid,
 	if (p->num_bad_objects) {
 		unsigned i;
 		for (i = 0; i < p->num_bad_objects; i++)
-			if (!hashcmp(oid->hash,
-				     p->bad_object_sha1 + the_hash_algo->rawsz * i))
+			if (hasheq(oid->hash,
+				   p->bad_object_sha1 + the_hash_algo->rawsz * i))
 				return 0;
 	}
 
diff --git a/patch-ids.c b/patch-ids.c
index 8f7c25d5db..960ea24054 100644
--- a/patch-ids.c
+++ b/patch-ids.c
@@ -28,14 +28,14 @@ int commit_patch_id(struct commit *commit, struct diff_options *options,
 /*
  * When we cannot load the full patch-id for both commits for whatever
  * reason, the function returns -1 (i.e. return error(...)). Despite
- * the "cmp" in the name of this function, the caller only cares about
+ * the "neq" in the name of this function, the caller only cares about
  * the return value being zero (a and b are equivalent) or non-zero (a
  * and b are different), and returning non-zero would keep both in the
  * result, even if they actually were equivalent, in order to err on
  * the side of safety.  The actual value being negative does not have
  * any significance; only that it is non-zero matters.
  */
-static int patch_id_cmp(const void *cmpfn_data,
+static int patch_id_neq(const void *cmpfn_data,
 			const void *entry,
 			const void *entry_or_key,
 			const void *unused_keydata)
@@ -53,7 +53,7 @@ static int patch_id_cmp(const void *cmpfn_data,
 	    commit_patch_id(b->commit, opt, &b->patch_id, 0))
 		return error("Could not get patch ID for %s",
 			oid_to_hex(&b->commit->object.oid));
-	return oidcmp(&a->patch_id, &b->patch_id);
+	return !oideq(&a->patch_id, &b->patch_id);
 }
 
 int init_patch_ids(struct patch_ids *ids)
@@ -63,7 +63,7 @@ int init_patch_ids(struct patch_ids *ids)
 	ids->diffopts.detect_rename = 0;
 	ids->diffopts.flags.recursive = 1;
 	diff_setup_done(&ids->diffopts);
-	hashmap_init(&ids->patches, patch_id_cmp, &ids->diffopts, 256);
+	hashmap_init(&ids->patches, patch_id_neq, &ids->diffopts, 256);
 	return 0;
 }
 
diff --git a/read-cache.c b/read-cache.c
index d7b617f320..8d04d78a58 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -213,7 +213,7 @@ static int ce_compare_data(const struct cache_entry *ce, struct stat *st)
 	if (fd >= 0) {
 		struct object_id oid;
 		if (!index_fd(&oid, fd, st, OBJ_BLOB, ce->name, 0))
-			match = oidcmp(&oid, &ce->oid);
+			match = !oideq(&oid, &ce->oid);
 		/* index_fd() closed the file descriptor already */
 	}
 	return match;
@@ -254,7 +254,7 @@ static int ce_compare_gitlink(const struct cache_entry *ce)
 	 */
 	if (resolve_gitlink_ref(ce->name, "HEAD", &oid) < 0)
 		return 0;
-	return oidcmp(&oid, &ce->oid);
+	return !oideq(&oid, &ce->oid);
 }
 
 static int ce_modified_check_fs(const struct cache_entry *ce, struct stat *st)
@@ -767,7 +767,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
 	/* It was suspected to be racily clean, but it turns out to be Ok */
 	was_same = (alias &&
 		    !ce_stage(alias) &&
-		    !oidcmp(&alias->oid, &ce->oid) &&
+		    oideq(&alias->oid, &ce->oid) &&
 		    ce->ce_mode == alias->ce_mode);
 
 	if (pretend)
@@ -1668,7 +1668,7 @@ static int verify_hdr(struct cache_header *hdr, unsigned long size)
 	the_hash_algo->init_fn(&c);
 	the_hash_algo->update_fn(&c, hdr, size - the_hash_algo->rawsz);
 	the_hash_algo->final_fn(hash, &c);
-	if (hashcmp(hash, (unsigned char *)hdr + size - the_hash_algo->rawsz))
+	if (!hasheq(hash, (unsigned char *)hdr + size - the_hash_algo->rawsz))
 		return error("bad index file sha1 signature");
 	return 0;
 }
@@ -2030,7 +2030,7 @@ int read_index_from(struct index_state *istate, const char *path,
 	base_oid_hex = oid_to_hex(&split_index->base_oid);
 	base_path = xstrfmt("%s/sharedindex.%s", gitdir, base_oid_hex);
 	ret = do_read_index(split_index->base, base_path, 1);
-	if (oidcmp(&split_index->base_oid, &split_index->base->oid))
+	if (!oideq(&split_index->base_oid, &split_index->base->oid))
 		die("broken index, expect %s in %s, got %s",
 		    base_oid_hex, base_path,
 		    oid_to_hex(&split_index->base->oid));
@@ -2396,7 +2396,7 @@ static int verify_index_from(const struct index_state *istate, const char *path)
 	if (n != the_hash_algo->rawsz)
 		goto out;
 
-	if (hashcmp(istate->oid.hash, hash))
+	if (!hasheq(istate->oid.hash, hash))
 		goto out;
 
 	close(fd);
diff --git a/refs.c b/refs.c
index de81c7be7c..a7a75b4cc0 100644
--- a/refs.c
+++ b/refs.c
@@ -702,7 +702,7 @@ static int write_pseudoref(const char *pseudoref, const struct object_id *oid,
 				    pseudoref);
 			rollback_lock_file(&lock);
 			goto done;
-		} else if (oidcmp(&actual_old_oid, old_oid)) {
+		} else if (!oideq(&actual_old_oid, old_oid)) {
 			strbuf_addf(err, _("unexpected object ID when writing '%s'"),
 				    pseudoref);
 			rollback_lock_file(&lock);
@@ -744,7 +744,7 @@ static int delete_pseudoref(const char *pseudoref, const struct object_id *old_o
 		}
 		if (read_ref(pseudoref, &actual_old_oid))
 			die(_("could not read ref '%s'"), pseudoref);
-		if (oidcmp(&actual_old_oid, old_oid)) {
+		if (!oideq(&actual_old_oid, old_oid)) {
 			error(_("unexpected object ID when deleting '%s'"),
 			      pseudoref);
 			rollback_lock_file(&lock);
@@ -875,13 +875,13 @@ static int read_ref_at_ent(struct object_id *ooid, struct object_id *noid,
 		 */
 		if (!is_null_oid(&cb->ooid)) {
 			oidcpy(cb->oid, noid);
-			if (oidcmp(&cb->ooid, noid))
+			if (!oideq(&cb->ooid, noid))
 				warning(_("log for ref %s has gap after %s"),
 					cb->refname, show_date(cb->date, cb->tz, DATE_MODE(RFC2822)));
 		}
 		else if (cb->date == cb->at_time)
 			oidcpy(cb->oid, noid);
-		else if (oidcmp(noid, cb->oid))
+		else if (!oideq(noid, cb->oid))
 			warning(_("log for ref %s unexpectedly ended on %s"),
 				cb->refname, show_date(cb->date, cb->tz,
 						       DATE_MODE(RFC2822)));
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 1f1a98e4cb..16ef9325e0 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -841,7 +841,7 @@ static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock,
 			return 0;
 		}
 	}
-	if (old_oid && oidcmp(&lock->old_oid, old_oid)) {
+	if (old_oid && !oideq(&lock->old_oid, old_oid)) {
 		strbuf_addf(err, "ref '%s' is at %s but expected %s",
 			    lock->ref_name,
 			    oid_to_hex(&lock->old_oid),
@@ -2307,7 +2307,7 @@ static int check_old_oid(struct ref_update *update, struct object_id *oid,
 			 struct strbuf *err)
 {
 	if (!(update->flags & REF_HAVE_OLD) ||
-		   !oidcmp(oid, &update->old_oid))
+		   oideq(oid, &update->old_oid))
 		return 0;
 
 	if (is_null_oid(&update->old_oid))
@@ -2443,7 +2443,7 @@ static int lock_ref_for_update(struct files_ref_store *refs,
 	    !(update->flags & REF_DELETING) &&
 	    !(update->flags & REF_LOG_ONLY)) {
 		if (!(update->type & REF_ISSYMREF) &&
-		    !oidcmp(&lock->old_oid, &update->new_oid)) {
+		    oideq(&lock->old_oid, &update->new_oid)) {
 			/*
 			 * The reference already has the desired
 			 * value, so we don't need to write it.
diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index d447a731da..74e2996e93 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -1160,7 +1160,7 @@ static int write_with_updates(struct packed_ref_store *refs,
 						    "reference already exists",
 						    update->refname);
 					goto error;
-				} else if (oidcmp(&update->old_oid, iter->oid)) {
+				} else if (!oideq(&update->old_oid, iter->oid)) {
 					strbuf_addf(err, "cannot update ref '%s': "
 						    "is at %s but expected %s",
 						    update->refname,
diff --git a/refs/ref-cache.c b/refs/ref-cache.c
index 9b110c8494..b7052f72e2 100644
--- a/refs/ref-cache.c
+++ b/refs/ref-cache.c
@@ -272,7 +272,7 @@ static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2
 		/* This is impossible by construction */
 		die("Reference directory conflict: %s", ref1->name);
 
-	if (oidcmp(&ref1->u.value.oid, &ref2->u.value.oid))
+	if (!oideq(&ref1->u.value.oid, &ref2->u.value.oid))
 		die("Duplicated ref, and SHA1s don't match: %s", ref1->name);
 
 	warning("Duplicated ref: %s", ref1->name);
diff --git a/remote.c b/remote.c
index 9a07951769..682f2a01f9 100644
--- a/remote.c
+++ b/remote.c
@@ -1389,7 +1389,7 @@ void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
 
 		ref->deletion = is_null_oid(&ref->new_oid);
 		if (!ref->deletion &&
-			!oidcmp(&ref->old_oid, &ref->new_oid)) {
+			oideq(&ref->old_oid, &ref->new_oid)) {
 			ref->status = REF_STATUS_UPTODATE;
 			continue;
 		}
@@ -1404,7 +1404,7 @@ void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
 		 * branch.
 		 */
 		if (ref->expect_old_sha1) {
-			if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
+			if (!oideq(&ref->old_oid, &ref->old_oid_expect))
 				reject_reason = REF_STATUS_REJECT_STALE;
 			else
 				/* If the ref isn't stale then force the update. */
@@ -2001,7 +2001,7 @@ struct ref *guess_remote_head(const struct ref *head,
 	/* If refs/heads/master could be right, it is. */
 	if (!all) {
 		r = find_ref_by_name(refs, "refs/heads/master");
-		if (r && !oidcmp(&r->old_oid, &head->old_oid))
+		if (r && oideq(&r->old_oid, &head->old_oid))
 			return copy_ref(r);
 	}
 
@@ -2009,7 +2009,7 @@ struct ref *guess_remote_head(const struct ref *head,
 	for (r = refs; r; r = r->next) {
 		if (r != head &&
 		    starts_with(r->name, "refs/heads/") &&
-		    !oidcmp(&r->old_oid, &head->old_oid)) {
+		    oideq(&r->old_oid, &head->old_oid)) {
 			*tail = copy_ref(r);
 			tail = &((*tail)->next);
 			if (!all)
diff --git a/revision.c b/revision.c
index 494cc041fa..e18bd530e4 100644
--- a/revision.c
+++ b/revision.c
@@ -3238,7 +3238,7 @@ static void track_linear(struct rev_info *revs, struct commit *commit)
 		struct commit_list *p;
 		for (p = revs->previous_parents; p; p = p->next)
 			if (p->item == NULL || /* first commit */
-			    !oidcmp(&p->item->object.oid, &commit->object.oid))
+			    oideq(&p->item->object.oid, &commit->object.oid))
 				break;
 		revs->linear = p != NULL;
 	}
diff --git a/sequencer.c b/sequencer.c
index 9ba873b875..00cefd129e 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -614,7 +614,7 @@ static int is_index_unchanged(void)
 	if (!(cache_tree_oid = get_cache_tree_oid()))
 		return -1;
 
-	return !oidcmp(cache_tree_oid, get_commit_tree_oid(head_commit));
+	return oideq(cache_tree_oid, get_commit_tree_oid(head_commit));
 }
 
 static int write_author_script(const char *message)
@@ -1221,7 +1221,7 @@ static int parse_head(struct commit **head)
 		current_head = lookup_commit_reference(the_repository, &oid);
 		if (!current_head)
 			return error(_("could not parse HEAD"));
-		if (oidcmp(&oid, &current_head->object.oid)) {
+		if (!oideq(&oid, &current_head->object.oid)) {
 			warning(_("HEAD %s is not a commit!"),
 				oid_to_hex(&oid));
 		}
@@ -1291,9 +1291,9 @@ static int try_to_commit(struct strbuf *msg, const char *author,
 		goto out;
 	}
 
-	if (!(flags & ALLOW_EMPTY) && !oidcmp(current_head ?
-					      get_commit_tree_oid(current_head) :
-					      the_hash_algo->empty_tree, &tree)) {
+	if (!(flags & ALLOW_EMPTY) && oideq(current_head ?
+					    get_commit_tree_oid(current_head) :
+					    the_hash_algo->empty_tree, &tree)) {
 		res = 1; /* run 'git commit' to display error message */
 		goto out;
 	}
@@ -1398,7 +1398,7 @@ static int is_original_commit_empty(struct commit *commit)
 		ptree_oid = the_hash_algo->empty_tree; /* commit is root */
 	}
 
-	return !oidcmp(ptree_oid, get_commit_tree_oid(commit));
+	return oideq(ptree_oid, get_commit_tree_oid(commit));
 }
 
 /*
@@ -1678,7 +1678,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 		unborn = get_oid("HEAD", &head);
 		/* Do we want to generate a root commit? */
 		if (is_pick_or_similar(command) && opts->have_squash_onto &&
-		    !oidcmp(&head, &opts->squash_onto)) {
+		    oideq(&head, &opts->squash_onto)) {
 			if (is_fixup(command))
 				return error(_("cannot fixup root commit"));
 			flags |= CREATE_ROOT_COMMIT;
@@ -1721,7 +1721,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 			oid_to_hex(&commit->object.oid));
 
 	if (opts->allow_ff && !is_fixup(command) &&
-	    ((parent && !oidcmp(&parent->object.oid, &head)) ||
+	    ((parent && oideq(&parent->object.oid, &head)) ||
 	     (!parent && unborn))) {
 		if (is_rebase_i(opts))
 			write_author_script(msg.message);
@@ -2426,7 +2426,7 @@ static int rollback_is_safe(void)
 	if (get_oid("HEAD", &actual_head))
 		oidclr(&actual_head);
 
-	return !oidcmp(&actual_head, &expected_head);
+	return oideq(&actual_head, &expected_head);
 }
 
 static int reset_for_rollback(const struct object_id *oid)
@@ -2987,7 +2987,7 @@ static int do_merge(struct commit *commit, const char *arg, int arg_len,
 	}
 
 	if (opts->have_squash_onto &&
-	    !oidcmp(&head_commit->object.oid, &opts->squash_onto)) {
+	    oideq(&head_commit->object.oid, &opts->squash_onto)) {
 		/*
 		 * When the user tells us to "merge" something into a
 		 * "[new root]", let's simply fast-forward to the merge head.
@@ -3056,8 +3056,8 @@ static int do_merge(struct commit *commit, const char *arg, int arg_len,
 	 * commit, we cannot fast-forward.
 	 */
 	can_fast_forward = opts->allow_ff && commit && commit->parents &&
-		!oidcmp(&commit->parents->item->object.oid,
-			&head_commit->object.oid);
+		oideq(&commit->parents->item->object.oid,
+		      &head_commit->object.oid);
 
 	/*
 	 * If any merge head is different from the original one, we cannot
@@ -3067,7 +3067,7 @@ static int do_merge(struct commit *commit, const char *arg, int arg_len,
 		struct commit_list *p = commit->parents->next;
 
 		for (j = to_merge; j && p; j = j->next, p = p->next)
-			if (oidcmp(&j->item->object.oid,
+			if (!oideq(&j->item->object.oid,
 				   &p->item->object.oid)) {
 				can_fast_forward = 0;
 				break;
@@ -3135,8 +3135,8 @@ static int do_merge(struct commit *commit, const char *arg, int arg_len,
 	write_message("no-ff", 5, git_path_merge_mode(the_repository), 0);
 
 	bases = get_merge_bases(head_commit, merge_commit);
-	if (bases && !oidcmp(&merge_commit->object.oid,
-			     &bases->item->object.oid)) {
+	if (bases && oideq(&merge_commit->object.oid,
+			   &bases->item->object.oid)) {
 		ret = 0;
 		/* skip merging an ancestor of HEAD */
 		goto leave_merge;
@@ -3382,9 +3382,9 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 				 */
 				if (item->command == TODO_REWORD &&
 				    !get_oid("HEAD", &oid) &&
-				    (!oidcmp(&item->commit->object.oid, &oid) ||
+				    (oideq(&item->commit->object.oid, &oid) ||
 				     (opts->have_squash_onto &&
-				      !oidcmp(&opts->squash_onto, &oid))))
+				      oideq(&opts->squash_onto, &oid))))
 					to_amend = 1;
 
 				return res | error_with_patch(item->commit,
@@ -3599,7 +3599,7 @@ static int commit_staged_changes(struct replay_opts *opts,
 		if (get_oid_hex(rev.buf, &to_amend))
 			return error(_("invalid contents: '%s'"),
 				rebase_path_amend());
-		if (!is_clean && oidcmp(&head, &to_amend))
+		if (!is_clean && !oideq(&head, &to_amend))
 			return error(_("\nYou have uncommitted changes in your "
 				       "working tree. Please, commit them\n"
 				       "first and then run 'git rebase "
@@ -3611,7 +3611,7 @@ static int commit_staged_changes(struct replay_opts *opts,
 		 * the commit message and if there was a squash, let the user
 		 * edit it.
 		 */
-		if (is_clean && !oidcmp(&head, &to_amend) &&
+		if (is_clean && oideq(&head, &to_amend) &&
 		    opts->current_fixup_count > 0 &&
 		    file_exists(rebase_path_stopped_sha())) {
 			const char *p = opts->current_fixups.buf;
@@ -4578,7 +4578,7 @@ int skip_unnecessary_picks(void)
 		if (item->commit->parents->next)
 			break; /* merge commit */
 		parent_oid = &item->commit->parents->item->object.oid;
-		if (hashcmp(parent_oid->hash, oid->hash))
+		if (!oideq(parent_oid, oid))
 			break;
 		oid = &item->commit->object.oid;
 	}
diff --git a/sha1-array.c b/sha1-array.c
index 265941fbf4..b94e0ec0f5 100644
--- a/sha1-array.c
+++ b/sha1-array.c
@@ -69,7 +69,7 @@ int oid_array_for_each_unique(struct oid_array *array,
 
 	for (i = 0; i < array->nr; i++) {
 		int ret;
-		if (i > 0 && !oidcmp(array->oid + i, array->oid + i - 1))
+		if (i > 0 && oideq(array->oid + i, array->oid + i - 1))
 			continue;
 		ret = fn(array->oid + i, data);
 		if (ret)
diff --git a/sha1-file.c b/sha1-file.c
index 97b7423848..d85f4e93e1 100644
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -149,10 +149,10 @@ static struct cached_object *find_cached_object(const struct object_id *oid)
 	struct cached_object *co = cached_objects;
 
 	for (i = 0; i < cached_object_nr; i++, co++) {
-		if (!oidcmp(&co->oid, oid))
+		if (oideq(&co->oid, oid))
 			return co;
 	}
-	if (!oidcmp(oid, the_hash_algo->empty_tree))
+	if (oideq(oid, the_hash_algo->empty_tree))
 		return &empty_tree;
 	return NULL;
 }
@@ -825,7 +825,7 @@ int check_object_signature(const struct object_id *oid, void *map,
 
 	if (map) {
 		hash_object_file(map, size, type, &real_oid);
-		return oidcmp(oid, &real_oid) ? -1 : 0;
+		return !oideq(oid, &real_oid) ? -1 : 0;
 	}
 
 	st = open_istream(oid, &obj_type, &size, NULL);
@@ -852,7 +852,7 @@ int check_object_signature(const struct object_id *oid, void *map,
 	}
 	the_hash_algo->final_fn(real_oid.hash, &c);
 	close_istream(st);
-	return oidcmp(oid, &real_oid) ? -1 : 0;
+	return !oideq(oid, &real_oid) ? -1 : 0;
 }
 
 int git_open_cloexec(const char *name, int flags)
@@ -1671,7 +1671,7 @@ static int write_loose_object(const struct object_id *oid, char *hdr,
 		die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid),
 		    ret);
 	the_hash_algo->final_fn(parano_oid.hash, &c);
-	if (oidcmp(oid, &parano_oid) != 0)
+	if (!oideq(oid, &parano_oid))
 		die(_("confused by unstable object source data for %s"),
 		    oid_to_hex(oid));
 
@@ -2213,7 +2213,7 @@ static int check_stream_sha1(git_zstream *stream,
 	}
 
 	the_hash_algo->final_fn(real_sha1, &c);
-	if (hashcmp(expected_sha1, real_sha1)) {
+	if (!hasheq(expected_sha1, real_sha1)) {
 		error(_("sha1 mismatch for %s (expected %s)"), path,
 		      sha1_to_hex(expected_sha1));
 		return -1;
diff --git a/sha1-name.c b/sha1-name.c
index fbcd2f78eb..faa60f69e3 100644
--- a/sha1-name.c
+++ b/sha1-name.c
@@ -46,7 +46,7 @@ static void update_candidates(struct disambiguate_state *ds, const struct object
 		oidcpy(&ds->candidate, current);
 		ds->candidate_exists = 1;
 		return;
-	} else if (!oidcmp(&ds->candidate, current)) {
+	} else if (oideq(&ds->candidate, current)) {
 		/* the same as what we already have seen */
 		return;
 	}
diff --git a/submodule-config.c b/submodule-config.c
index fc2c41b947..e04ba756d9 100644
--- a/submodule-config.c
+++ b/submodule-config.c
@@ -45,7 +45,7 @@ static int config_path_cmp(const void *unused_cmp_data,
 	const struct submodule_entry *b = entry_or_key;
 
 	return strcmp(a->config->path, b->config->path) ||
-	       oidcmp(&a->config->gitmodules_oid, &b->config->gitmodules_oid);
+	       !oideq(&a->config->gitmodules_oid, &b->config->gitmodules_oid);
 }
 
 static int config_name_cmp(const void *unused_cmp_data,
@@ -57,7 +57,7 @@ static int config_name_cmp(const void *unused_cmp_data,
 	const struct submodule_entry *b = entry_or_key;
 
 	return strcmp(a->config->name, b->config->name) ||
-	       oidcmp(&a->config->gitmodules_oid, &b->config->gitmodules_oid);
+	       !oideq(&a->config->gitmodules_oid, &b->config->gitmodules_oid);
 }
 
 static struct submodule_cache *submodule_cache_alloc(void)
diff --git a/submodule.c b/submodule.c
index 058fc9f885..ed05339b58 100644
--- a/submodule.c
+++ b/submodule.c
@@ -537,7 +537,7 @@ static void show_submodule_header(struct diff_options *o, const char *path,
 			fast_backward = 1;
 	}
 
-	if (!oidcmp(one, two)) {
+	if (oideq(one, two)) {
 		strbuf_release(&sb);
 		return;
 	}
diff --git a/t/helper/test-dump-cache-tree.c b/t/helper/test-dump-cache-tree.c
index 98a4891f1d..6a3f88f5f5 100644
--- a/t/helper/test-dump-cache-tree.c
+++ b/t/helper/test-dump-cache-tree.c
@@ -33,7 +33,7 @@ static int dump_cache_tree(struct cache_tree *it,
 	}
 	else {
 		dump_one(it, pfx, "");
-		if (oidcmp(&it->oid, &ref->oid) ||
+		if (!oideq(&it->oid, &ref->oid) ||
 		    ref->entry_count != it->entry_count ||
 		    ref->subtree_nr != it->subtree_nr) {
 			/* claims to be valid but is lying */
diff --git a/transport.c b/transport.c
index 06ffea2774..1c76d64aba 100644
--- a/transport.c
+++ b/transport.c
@@ -1228,7 +1228,7 @@ int transport_fetch_refs(struct transport *transport, struct ref *refs)
 		nr_refs++;
 		if (rm->peer_ref &&
 		    !is_null_oid(&rm->old_oid) &&
-		    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
+		    oideq(&rm->peer_ref->old_oid, &rm->old_oid))
 			continue;
 		ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 		heads[nr_heads++] = rm;
diff --git a/tree-diff.c b/tree-diff.c
index 553bc0e63a..425668e1e0 100644
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -491,7 +491,7 @@ static struct combine_diff_path *ll_diff_tree_paths(
 						continue;
 
 					/* diff(t,pi) != ø */
-					if (oidcmp(t.entry.oid, tp[i].entry.oid) ||
+					if (!oideq(t.entry.oid, tp[i].entry.oid) ||
 					    (t.entry.mode != tp[i].entry.mode))
 						continue;
 
diff --git a/unpack-trees.c b/unpack-trees.c
index 55f864ac57..65f157b9de 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -679,7 +679,7 @@ static int switch_cache_bottom(struct traverse_info *info)
 
 static inline int are_same_oid(struct name_entry *name_j, struct name_entry *name_k)
 {
-	return name_j->oid && name_k->oid && !oidcmp(name_j->oid, name_k->oid);
+	return name_j->oid && name_k->oid && oideq(name_j->oid, name_k->oid);
 }
 
 static int all_trees_same_as_cache_tree(int n, unsigned long dirmask,
@@ -1678,7 +1678,7 @@ static int same(const struct cache_entry *a, const struct cache_entry *b)
 	if ((a->ce_flags | b->ce_flags) & CE_CONFLICTED)
 		return 0;
 	return a->ce_mode == b->ce_mode &&
-	       !oidcmp(&a->oid, &b->oid);
+	       oideq(&a->oid, &b->oid);
 }
 
 
@@ -1810,7 +1810,7 @@ static int verify_clean_subdirectory(const struct cache_entry *ce,
 		 * If we are not going to update the submodule, then
 		 * we don't care.
 		 */
-		if (!sub_head && !oidcmp(&oid, &ce->oid))
+		if (!sub_head && oideq(&oid, &ce->oid))
 			return 0;
 		return verify_clean_submodule(sub_head ? NULL : oid_to_hex(&oid),
 					      ce, error_type, o);
diff --git a/wt-status.c b/wt-status.c
index 5ffab61015..1c8746d0ea 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -453,8 +453,8 @@ static void wt_status_collect_changed_cb(struct diff_queue_struct *q,
 			d->worktree_status = p->status;
 		if (S_ISGITLINK(p->two->mode)) {
 			d->dirty_submodule = p->two->dirty_submodule;
-			d->new_submodule_commits = !!oidcmp(&p->one->oid,
-							    &p->two->oid);
+			d->new_submodule_commits = !oideq(&p->one->oid,
+							  &p->two->oid);
 			if (s->status_format == STATUS_FORMAT_SHORT)
 				d->worktree_status = short_submodule_status(d);
 		}
@@ -1487,10 +1487,10 @@ static void wt_status_get_detached_from(struct wt_status_state *state)
 
 	if (dwim_ref(cb.buf.buf, cb.buf.len, &oid, &ref) == 1 &&
 	    /* sha1 is a commit? match without further lookup */
-	    (!oidcmp(&cb.noid, &oid) ||
+	    (oideq(&cb.noid, &oid) ||
 	     /* perhaps sha1 is a tag, try to dereference to a commit */
 	     ((commit = lookup_commit_reference_gently(the_repository, &oid, 1)) != NULL &&
-	      !oidcmp(&cb.noid, &commit->object.oid)))) {
+	      oideq(&cb.noid, &commit->object.oid)))) {
 		const char *from = ref;
 		if (!skip_prefix(from, "refs/tags/", &from))
 			skip_prefix(from, "refs/remotes/", &from);
@@ -1500,7 +1500,7 @@ static void wt_status_get_detached_from(struct wt_status_state *state)
 			xstrdup(find_unique_abbrev(&cb.noid, DEFAULT_ABBREV));
 	oidcpy(&state->detached_oid, &cb.noid);
 	state->detached_at = !get_oid("HEAD", &oid) &&
-			     !oidcmp(&oid, &state->detached_oid);
+			     oideq(&oid, &state->detached_oid);
 
 	free(ref);
 	strbuf_release(&cb.buf);
diff --git a/xdiff-interface.c b/xdiff-interface.c
index ec6e574e4a..e7af95db86 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -186,7 +186,7 @@ void read_mmblob(mmfile_t *ptr, const struct object_id *oid)
 	unsigned long size;
 	enum object_type type;
 
-	if (!oidcmp(oid, &null_oid)) {
+	if (oideq(oid, &null_oid)) {
 		ptr->ptr = xstrdup("");
 		ptr->size = 0;
 		return;