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Re: -O3 and new optimizations in 4.4.0
- From: "Joseph S. Myers" <joseph at codesourcery dot com>
- To: David Ronis <ronis at ronispc dot chem dot mcgill dot ca>
- Cc: gcc at gcc dot gnu dot org
- Date: Thu, 23 Apr 2009 15:57:50 +0000 (UTC)
- Subject: Re: -O3 and new optimizations in 4.4.0
- References: <1240502045.3828.3.camel@ronispc.chem.mcgill.ca>
On Thu, 23 Apr 2009, David Ronis wrote:
> >From the info pages it seems that the new optimizations,
> -floop-interchange, -floop-strip-mine, and -floop-block, are NOT turned
> on when -O3 is specified. Is this correct and if so, why aren't they?
Because the behavior of -O3 must not depend on whether optional libraries
are linked into GCC, and we did not decide to make PPL and CLooG required
to build GCC, so -O3 cannot enable any optimizations using optional
libraries.
--
Joseph S. Myers
joseph@codesourcery.com