From: "Alexei A. Frounze" <alex DOT fru AT mtu-net DOT ru>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: THE -O2 PROBLEM - PART II
Date: Sat, 15 Apr 2000 12:16:41 +0400
Organization: MTU-Intel ISP
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To: djgpp AT delorie DOT com
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it eliminates C code but not inline asembly.

For example:

if (KeyMap[sTab]) {		// key is pressed
  do_something();
  while (KeyMap[sTab]) {};	// this line is replaced with infinite loop
}

But I need that line AS-IS.

thanks.
Alexei A. Frounze
-----------------------------------------
Homepage: http://alexfru.chat.ru
Mirror:   http://members.xoom.com/alexfru

Eli Zaretskii wrote:
> 
> "Alexei A. Frounze" wrote:
> >
> > But with optimizations enabled, I simply get faulty code, since compiler
> > eliminates checking of the array. How to prevent this from optimizations?
> 
> If the compiler eliminates the entire inline asm block, one way to prevent it
> is with "__asm__ __volatile__" instead of just "__asm__" or "asm".
> 
> If that's not the problem, I suggest to post the offending code fragment and
> its surroundings.