path: root/patch-ids.c
diff options
authorJeff King <>2018-08-28 21:22:55 (GMT)
committerJunio C Hamano <>2018-08-29 18:32:49 (GMT)
commitcc00e5ce6b50cf4197e137b87a33209568b1e662 (patch)
tree9916928816a1c27728736f4702e7371e7add0fcd /patch-ids.c
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 <>
Diffstat (limited to 'patch-ids.c')
1 files changed, 4 insertions, 4 deletions
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;