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Re: what is -O1 doing?

From: FX Coudert <fxcoudert at gmail dot com>
To: Mike Kumbera <kumbera1 at llnl dot gov>
Cc: GFORTRAN List <fortran at gcc dot gnu dot org>, gcc-help at gcc dot gnu dot org
Date: Fri, 13 Apr 2007 23:57:51 +0200
Subject: Re: what is -O1 doing?
References: <20070413214528.GA29167@oldben.llnl.gov>

I was trying to find out which O1 optimization was causing the
problems but I can't reproduce the crash when I specify:
-fdefer-pop -fdelayed-branch -fguess-branch-probability -fcprop- registers -fif-conversion -fif-conversion2 -ftree-ccp -ftree-dce -ftree- dominator-opts -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename - ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants

which is what the gcc man page reports for -O1 flags... Is there a way to get from gfortan a set of flags it's setting when it is given a -O1?

This is more a question for gcc-help. I think not all the behaviour implied by -O1 can be controled by individual -f options.

FX

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