This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: Packing booleans?

From: Mattias Karlsson <betasoft at acc dot umu dot se>
To: Nathan Sidwell <nathan at codesourcery dot com>
Cc: Sam Lauber <sam124 at operamail dot com>, gcc at gcc dot gnu dot org
Date: Wed, 4 May 2005 14:21:41 +0200 (MEST)
Subject: Re: Packing booleans?
References: <20050504062627.3691C416118@ws5-2.us4.outblaze.com><4278A497.5040301@codesourcery.com>

On Wed, 4 May 2005, Nathan Sidwell wrote:

Sam Lauber wrote:
Would it be possible to have a -fpack-bools option that packs booleans into the smallest form possible (8 booleans -> 1 8-bit reg, etc.) into a register (or memory, as the case may be)?
why would you want to do this?  Seems to me you might save up to 7 bytes
of data memory at a vastly greater expansion of code size and reduction
in performance.

Unless you are using an architecture with btst, bset, bclr instructions.

Follow-Ups:
- Re: Packing booleans?
  - From: Nathan Sidwell

References:
- Packing booleans?
  - From: Sam Lauber
- Re: Packing booleans?
  - From: Nathan Sidwell

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]