This is the mail archive of the gcc-patches@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: [patch] Empty loop removal

From: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>
To: Andrew Pinski <pinskia at physics dot uc dot edu>
Cc: gcc-patches at gcc dot gnu dot org
Date: Fri, 1 Jul 2005 01:04:15 +0200
Subject: Re: [patch] Empty loop removal
References: <20050630214110.GA15576@atrey.karlin.mff.cuni.cz> <07cb3715c026b892a151e7cba8a5eb13@physics.uc.edu>

Hello,

> >+   for (i = 0; i != n; i += 2)
> >+     ;
> 
> Can't we just convert this loop to:
> if ((n%2) != 0)
>   while (true) ;
> 
> Or do we need to know more information?

yes, we can.  But I don't see any practical gain in implementing
this optimization.

Zdenek

References:
- [patch] Empty loop removal
  - From: Zdenek Dvorak
- Re: [patch] Empty loop removal
  - From: Andrew Pinski

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