Julian Brown wrote:
> On Tue, 7 Sep 2010 12:55:59 +0200
> Loïc Minier <loic.min...@linaro.org> wrote:
> 
>> On Tue, Sep 07, 2010, Julian Brown wrote:
>>>                                                                       Do
>>> you still have the code fragment handy (I don't remember exactly how
>>> it went)?
>>  You can extract it from the wiki history with the "Info" action on
>> the page and then diffing revisions:
> 
> Oh right, I should have realised that :-).
> 

> 
> So yeah, I think there is indeed a possible improvement here (and we
> don't even need to break the EABI, I don't think). Unless I've
> overlooked something, anyway...
Julian,
I revert back the first example, and add your comments in it.
https://wiki.linaro.org/YaoQi/Sandbox/Thumb2SizeOptimize

In order to teach gcc chooses low register when keeping stack alignment,
which part of gcc shall I have a look? Is it about RA or regrename?

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