Newsgroups:	comp.os.msdos.djgpp
From:	Elliott Oti <e DOT oti AT stud DOT warande DOT ruu DOT nl>
Subject:	Re: Disabling use of registers
Sender:	usenet AT fys DOT ruu DOT nl (News system Tijgertje)
Message-ID:	<34651599.3CBA@stud.warande.ruu.nl>
Date:	Sun, 9 Nov 1997 01:44:57 GMT
References:	<O6EQDcF78GA DOT 198 AT upnetnews03>
Mime-Version:	1.0
Organization:	Bipolar Widgets International
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Carolyn Kelly-Pajot wrote:
> 
> Is there a way of making GCC not use a certain register? I'm trying to use some
> registers to speed up code, and want to make sure they are not used by the rest
> of my code.

Not as far as I know. But what's the problem? The 386 has only six
general registers ( seven, if you count %ebp ), and that is not much;
denying gcc the use of a register is likely to make the code slower. 
If your concern is that inline code tends to get mangled by the
optimiser, try declaring your inline assembler code as asm volatile
instead of plain asm.

-- 
------------ Elliott Oti ---------------
   ------------- http://www.fys.ruu.nl/~oti  ---------

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