diff options
authorJeff King <>2018-08-28 21:22:55 (GMT)
committerJunio C Hamano <>2018-08-29 18:32:49 (GMT)
commitcc00e5ce6b50cf4197e137b87a33209568b1e662 (patch)
parent67947c34ae8f666e72b9406a38984fe8386f5e50 (diff)
convert hashmap comparison functions to oideq()
The comparison functions used for hashmaps don't care about strict ordering; they only want to compare entries for equality. Let's use the oideq() function instead, which can potentially be better optimized. Note that unlike the previous patches mass-converting calls like "!oidcmp()", this patch could actually provide an improvement even with the current implementation. Those comparison functions are passed around as function pointers, so at compile-time the compiler cannot realize that the caller (which is in another file completely) will treat the return value as a boolean. Note that this does change the return values in quite a subtle way (it's still an int, but now the sign bit is irrelevant for ordering). Because of their funny hashmap-specific signature, it's unlikely that any of these static functions would be reused for more generic ordering. But to be double-sure, let's stop using "cmp" in their names. Calling them "eq" doesn't quite work either, because the hashmap convention is actually _inverted_. "0" means "same", and non-zero means "different". So I've called them "neq" by convention here. Signed-off-by: Jeff King <> Signed-off-by: Junio C Hamano <>
3 files changed, 13 insertions, 13 deletions
diff --git a/builtin/describe.c b/builtin/describe.c
index 1e7c75b..22c0541 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)
@@ -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/oidmap.c b/oidmap.c
index d9fb19b..b0841a0 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/patch-ids.c b/patch-ids.c
index 8f7c25d..960ea24 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",
- 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;
- hashmap_init(&ids->patches, patch_id_cmp, &ids->diffopts, 256);
+ hashmap_init(&ids->patches, patch_id_neq, &ids->diffopts, 256);
return 0;