Re: [PATCH 2/2] pretty: use fmt_output_email_subject()

["René Scharfe" <l.s.r@web.de>]

Am 01.03.2017 um 12:37 schrieb René Scharfe:
> Add the email-style subject prefix (e.g. "Subject: [PATCH] ") directly
> when it's needed instead of letting log_write_email_headers() prepare
> it in a static buffer in advance.  This simplifies storage ownership and
> code flow.
>
> Signed-off-by: Rene Scharfe <l.s.r@web.de>
> ---
> This slows down the last three tests in p4000 by ca. 3% for some reason,
> so we may want to only do the first part for now, which is performance
> neutral on my machine.

Update below.

> diff --git a/commit.h b/commit.h
> index 9c12abb911..459daef94a 100644
> --- a/commit.h
> +++ b/commit.h
> @@ -142,21 +142,24 @@ static inline int cmit_fmt_is_mail(enum cmit_fmt fmt)
>  	return (fmt == CMIT_FMT_EMAIL || fmt == CMIT_FMT_MBOXRD);
>  }
>
> +struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
> +
>  struct pretty_print_context {
>  	/*
>  	 * Callers should tweak these to change the behavior of pp_* functions.
>  	 */
>  	enum cmit_fmt fmt;
>  	int abbrev;
> -	const char *subject;
>  	const char *after_subject;
>  	int preserve_subject;
>  	struct date_mode date_mode;
>  	unsigned date_mode_explicit:1;
> +	unsigned print_email_subject:1;

Turning this into an int restores performance according to p4000. 
Didn't know that bitfields can be *that* expensive.

René