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

From: Weddington, Eric
Subject: RE: [avr-gcc-list] regression in size from 4.2.2 to 4.5.0
Date: Wed, 6 May 2009 14:01:25 -0600


> -----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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