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: [gfortran,patch] Use short-circuiting IF and AND expressions in gfortran

From: "Andrew Pinski" <pinskia at gmail dot com>
To: "FX Coudert" <fxcoudert at gmail dot com>
Cc: "gfortran List" <fortran at gcc dot gnu dot org>, "gcc-patches List" <gcc-patches at gcc dot gnu dot org>
Date: Mon, 5 Mar 2007 12:02:34 -0800
Subject: Re: [gfortran,patch] Use short-circuiting IF and AND expressions in gfortran
References: <D24AF731-F78B-4D8E-A467-C6D2ED60C4F3@gmail.com>

On 3/4/07, FX Coudert <fxcoudert@gmail.com> wrote:

Hi all,
I'm not sure whether this can really help the middle-end and
optimizers, and couldn't measure any performance gain on some
generated executables, but I think it's worth doing nonetheless.


I doubt it will middle-end as most of time (at least on x86), the
short-circuiting ones are converted back to the non short-circuiting
ones if there is no side effects on both sides.  So really you might
end up slowing down the compiler :).

-- Pinski

References:
- [gfortran,patch] Use short-circuiting IF and AND expressions in gfortran
  - From: FX Coudert

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