Re: [PATCH v2 12/22] tree-diff.c: move S_DIFFTREE_IFXMIN_NEQ define from cache.h

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On Sat, Apr 22 2023, Elijah Newren via GitGitGadget wrote:

> From: Elijah Newren <newren@xxxxxxxxx>
>
> S_DIFFTREE_IFXMIN_NEQ is *only* used in tree-diff.c, so there is no
> point exposing it in cache.h.  Move it to tree-diff.c.
>
> Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
> ---
>  cache.h     | 15 ---------------
>  tree-diff.c | 13 +++++++++++++
>  2 files changed, 13 insertions(+), 15 deletions(-)
>
> diff --git a/cache.h b/cache.h
> index ad741e70bc2..7a46f300d9b 100644
> --- a/cache.h
> +++ b/cache.h
> @@ -10,21 +10,6 @@
>  #include "object.h"
>  #include "statinfo.h"
>  
> -/*
> - * Some mode bits are also used internally for computations.
> - *
> - * They *must* not overlap with any valid modes, and they *must* not be emitted
> - * to outside world - i.e. appear on disk or network. In other words, it's just
> - * temporary fields, which we internally use, but they have to stay in-house.
> - *
> - * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git
> - *   codebase mode is `unsigned int` which is assumed to be at least 32 bits )
> - */
> -
> -/* used internally in tree-diff */
> -#define S_DIFFTREE_IFXMIN_NEQ	0x80000000
> -
> -
>  /*
>   * Basic data structures for the directory cache
>   */
> diff --git a/tree-diff.c b/tree-diff.c
> index 69031d7cbae..a76e6dae619 100644
> --- a/tree-diff.c
> +++ b/tree-diff.c
> @@ -6,6 +6,19 @@
>  #include "diffcore.h"
>  #include "tree.h"
>  
> +/*
> + * Some mode bits are also used internally for computations.
> + *
> + * They *must* not overlap with any valid modes, and they *must* not be emitted
> + * to outside world - i.e. appear on disk or network. In other words, it's just
> + * temporary fields, which we internally use, but they have to stay in-house.
> + *
> + * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git
> + *   codebase mode is `unsigned int` which is assumed to be at least 32 bits )
> + */
> +
> +#define S_DIFFTREE_IFXMIN_NEQ	0x80000000
> +
>  /*
>   * internal mode marker, saying a tree entry != entry of tp[imin]
>   * (see ll_diff_tree_paths for what it means there)

As it's only used in tree-diff.c, should this change not be instead
changing how we define S_IFXMIN_NEQ itself, and combining the two
comments seen here (the latter only partially, in the context).

Not that this makes things worse or anything...



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