This is the mail archive of the gcc-help@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: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations

From: Miles Bader <miles at gnu dot org>
To: Jeff Law <law at redhat dot com>
Cc: Jeff Kenton <jkenton at tilera dot com>, Ian Lance Taylor <iant at google dot com>, David Brown <david at westcontrol dot com>, Georg-Johann Lay <avr at gjlay dot de>, gcc-help at gcc dot gnu dot org, charfiasma at yahoo dot fr
Date: Tue, 27 Sep 2011 14:12:34 +0900
Subject: Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
References: <1316712613.83211.YahooMailNeo@web28503.mail.ukl.yahoo.com> <1316721552.42227.YahooMailNeo@web28508.mail.ukl.yahoo.com> <j5hb1j$pgl$1@dough.gmane.org> <4E7C4771.40803@gjlay.de> <4E7C4CCA.2010001@westcontrol.com> <mcr4o03wapm.fsf@coign.corp.google.com> <4E7CAB71.10901@tilera.com> <4E7CAE48.4090005@redhat.com> <buo39fiinic.fsf@dhlpc061.dev.necel.com> <buoty7yh8ri.fsf@dhlpc061.dev.necel.com>

Miles Bader <miles@gnu.org> writes:
>> Hmm, actually testing with a recent gcc snapshot, it _is_ merging the
>> two if-blocks:
> ...
>
> and in fact, gcc 4.4.6, 4.5.3, and 4.6.1 seem to do the same thing!
>
> So I dunno... what's the complaint again...?

I note that this optimization only takes place at -O2 or above; maybe
the original poster simply didn't use a high-enough optimization level?

-miles

-- 
I'd rather be consing.

Follow-Ups:
- Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: Amker.Cheng
- Re : Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: charfi asma

References:
- Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: charfi asma
- Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: David Brown
- Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: Georg-Johann Lay
- Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: David Brown
- Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: Ian Lance Taylor
- Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: Jeff Kenton
- Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: Jeff Law
- Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: Miles Bader
- Re: Tr : [redundency elimination, code motion, commun expression elimination] GCC optimizations
  - From: Miles Bader

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