[m68k] register renaming not properly tracking used registers

[Mark Mitchell]

Peter Barada wrote:

>>>>gcc/ChangeLog:
>>>>2004-09-103  Peter Barada <peter@the-baradas.com>
>>>>    * config/m68k/m68k.h (HARD_REGNO_RENAME_OK): New macro.
>>>>    * config/m68k/m68k.c (m68k_hard regno_rename_ok): Disallow
>>>>      renaming of non-live registers in interrupt functions.
>>>>    * config/m68k/m68k-protos.h (m68k_hard_regno_rename_ok): Add 
>>>>prototype.
>>>>        
>>>>
>>>
>>>Thanks, I've committed your patch on mainline (with a couple of
>>>trivial spacing fixes).
>>>
>>>I'd also like to backport it to 3.4, with Mark's approval.
>>>      
>>>
>>Does it fix a regression?
>>    
>>
>
>BTW, I *completely* messed up the date in the ChangeLog entry...
>
>I don't know if its a regression.
>
>I can pull out and build previous versions to see if this bug is there
>or not if you want.  Which gcc versions should I check?
>  
>
Any and all previous ones; if there's a previous release that gets this 
right, then we would want to apply the fix to the 3.4 branch.

Thanks,

-- 
Mark Mitchell
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