Re: [PATCH 3/3] path: remove redundant function calls

[Junio C Hamano <gitster@pobox.com>]

K Jayatheerth <jayatheerthkulkarni2005@gmail.com> writes:

> We fetch the exact same setting up to four times.
> We fix this by evaluating it once, storing it in a local variable,
> and referencing that variable.
>
> Signed-off-by: K Jayatheerth <jayatheerthkulkarni2005@gmail.com>
> ---
>  path.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)

The function body is guarded with "we initialize this just once and
return the value stored in a structure member", so 3 among four of
these calls incur only cost for a no-op call/return, but using a
temporary variable on this caller's side makes it clear that we are
not expecting any recomputation in the callee.

> diff --git a/path.c b/path.c
> index 56be5e1726..5cd38b2a16 100644
> --- a/path.c
> +++ b/path.c
> @@ -741,18 +741,18 @@ int calc_shared_perm(struct repository *repo,
>  		     int mode)
>  {
>  	int tweak;
> -
> -	if (repo_settings_get_shared_repository(repo) < 0)
> -		tweak = -repo_settings_get_shared_repository(repo);
> +	int shared_repo = repo_settings_get_shared_repository(repo);
> +	if (shared_repo < 0)
> +		tweak = -shared_repo;
>  	else
> -		tweak = repo_settings_get_shared_repository(repo);
> +		tweak = shared_repo;
>  
>  	if (!(mode & S_IWUSR))
>  		tweak &= ~0222;
>  	if (mode & S_IXUSR)
>  		/* Copy read bits to execute bits */
>  		tweak |= (tweak & 0444) >> 2;
> -	if (repo_settings_get_shared_repository(repo) < 0)
> +	if (shared_repo < 0)
>  		mode = (mode & ~0777) | tweak;
>  	else
>  		mode |= tweak;