From cc00e5ce6b50cf4197e137b87a33209568b1e662 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Tue, 28 Aug 2018 17:22:55 -0400 Subject: [PATCH] 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 --- builtin/describe.c | 6 +++--- oidmap.c | 12 ++++++------ patch-ids.c | 8 ++++---- 3 files changed, 13 insertions(+), 13 deletions(-) diff --git a/builtin/describe.c b/builtin/describe.c index 1e7c75ba82..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) @@ -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 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/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; } -- 2.43.2