From: Bakul Shah <bakul@bitblocks.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] some pcc questions
Date: Mon, 23 Apr 2012 07:37:52 -0700 [thread overview]
Message-ID: <166D6D22-2379-4200-94B8-355CFF8B277B@bitblocks.com> (raw)
In-Reply-To: <be234b67ea66906d62cbc5298e49f3c0@kw.quanstro.net>
On Apr 23, 2012, at 6:42 AM, erik quanstrom <quanstro@quanstro.net> wrote:
> crazy idea i haven't tried.
>
> why not use X in sam or acme to mass-edit fu:bar -> fu[bar] and just make
> fu an array.
? How will that work for something like
struct X {int a:5, :8, c:12,:7; float d;} x;
Usually you can convert bitfields ops to operations under masked -- what the compiler has to do. So reading x.c becomes ((x.i>>7)&0xfff) etc. Where x.i represents the same word where a &c are stored. I thought that (except for pcc) bitfields code gen & performance issues got fixed a long time ago?
prev parent reply other threads:[~2012-04-23 14:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-20 16:01 Jens Staal
2012-04-20 16:24 ` cinap_lenrek
2012-04-20 16:29 ` cinap_lenrek
2012-04-20 17:31 ` Charles Forsyth
2012-04-23 6:30 ` Jens Staal
2012-04-23 13:23 ` Comeau At9Fans
2012-04-23 13:19 ` Comeau At9Fans
[not found] ` <CAE9W7-gU72RNgbs6Pcuxp5KEtXBUsApZNGzNiEpvTgLtbL7wjw@mail.gmail.c>
2012-04-23 13:42 ` erik quanstrom
2012-04-23 14:37 ` Bakul Shah [this message]
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