Re: Difference between -O3 and -O2 with the -f options -O3 adds

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To: Matthias Kretz <Matthias.Kretz@xxxxxxxxxxxxxxxxxxxxx>, GCC-help <gcc-help@xxxxxxxxxxx>
Subject: Re: Difference between -O3 and -O2 with the -f options -O3 adds
From: "John (Eljay) Love-Jensen" <eljay@xxxxxxxxx>
Date: Wed, 29 Jul 2009 08:52:27 -0700
In-reply-to: <200907291743.25681.Matthias.Kretz@xxxxxxxxxxxxxxxxxxxxx>
User-agent: Microsoft-Entourage/13.0.0.090518

Hi Mattias,

> Any ideas how to debug this regression further?

Any interesting deltas between these two outputs (O2.s and O3.s):

touch Empty.cpp
gcc -O2 -fverbose-asm -S Empty.cpp -o O2.s
gcc -O3 -fverbose-asm -S Empty.cpp -o O3.s

HTH,
--Eljay

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