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Re: [avr-gcc-list] regression in size from 4.2.2 to 4.5.0

From: Sean D'Epagnier
Subject: Re: [avr-gcc-list] regression in size from 4.2.2 to 4.5.0
Date: Thu, 7 May 2009 00:20:34 -0600

Thanks for all the input.

I will do some more investigating myself and hopefully produce a small
test case as well as try to track down the actual commits to gcc which
caused it.  Unfortunately I suspect there are multiple causes to
blame.  I will post back when I have more information.  I thought
someone might have a guess or know right away what might have caused


On 5/6/09, Weddington, Eric <address@hidden> wrote:
>> -----Original Message-----
>> From:
>> address@hidden
>> [mailto:address@hidden
>> org] On Behalf Of Sean D'Epagnier
>> Sent: Wednesday, May 06, 2009 12:45 PM
>> To: address@hidden
>> Subject: [avr-gcc-list] regression in size from 4.2.2 to 4.5.0
>> Hi,
>> I was trying to reduce the size of my binary so it would fit on some
>> 128kb parts.  I normally used gcc 4.2.2 for this project, but decided
>> to try gcc 4.5.0.  To my surprise, the resulting binary was 3.5kb
>> _larger_ with the newer gcc.  This is a serious bug imho and should be
>> fixed.  I'm not quite sure why it did occur, but I have some guesses.
>> I have here the old (4.2.2 gcc) then the new (4.5.0 gcc) disassembly:
> The first step is to fill out a bug report at the GCC project. Let me know
> the bug number so I can track it.
> Next, it needs to be determined which version caused the biggest problem.
> 4.2.x? 4.3.x? 4.4.0? Or HEAD/4.5? It could just get progressively worse with
> each version, or perhaps there is some big jump in code size.

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