From: Jason Rumney <jasonr@gnu.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org, Kenichi Handa <handa@m17n.org>
Subject: Re: glyphless
Date: Mon, 26 Mar 2012 21:17:28 +0800 [thread overview]
Message-ID: <87zkb37b87.fsf@gnu.org> (raw)
In-Reply-To: <83haxcsgyk.fsf@gnu.org> (Eli Zaretskii's message of "Sun, 25 Mar 2012 19:55:47 +0200")
Eli Zaretskii <eliz@gnu.org> writes:
> /* Sub-stretch for type == GLYPHLESS_GLYPH. */
> struct
> {
> /* Value is an enum of the type glyphless_display_method. */
> unsigned method : 2;
> /* 1 iff this glyph is for a character of no font. */
> unsigned for_no_font : 1;
> /* Length of acronym or hexadecimal code string (at most 8). */
> unsigned len : 4;
> /* Character to display. Actually we need only 22 bits. */
> unsigned ch : 22; <<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> } glyphless;
>
> I though Andreas said that using 25 here, so that the entire member
> fits in 32 bits, would be better (performance-wise, I presume)?
Probably better is to define an extra member "padding" or "spare", to
make it clear that the ch portion is only 22 bits.
prev parent reply other threads:[~2012-03-26 13:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-25 17:55 glyphless Eli Zaretskii
2012-03-25 19:19 ` glyphless Andreas Schwab
2012-03-26 13:17 ` Jason Rumney [this message]
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