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hash: add an algo member to struct object_id

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Now that we're working with multiple hash algorithms in the same repo,
it's best if we label each object ID with its algorithm so we can
determine how to format a given object ID. Add a member called algo to
struct object_id.

Performance testing on object ID-heavy workloads doesn't reveal a clear
change in performance.  Out of performance tests t0001 and t1450, there
are slight variations in performance both up and down, but all
measurements are within the margin of error.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson 2021-04-26 01:02:49 +00:00 committed by Junio C Hamano
parent 89b43f80a5
commit cf0983213c
1 changed files with 1 additions and 0 deletions
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hash.h
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@ -181,6 +181,7 @@ static inline int hash_algo_by_ptr(const struct git_hash_algo *p)
struct object_id { struct object_id {
unsigned char hash[GIT_MAX_RAWSZ]; unsigned char hash[GIT_MAX_RAWSZ];
int algo;
}; };
#define the_hash_algo the_repository->hash_algo #define the_hash_algo the_repository->hash_algo