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Re: Does IRA support spilling to registers instead of stack?
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On 07/18/11 15:20, dpadgett_mail-000@yahoo.com wrote:
> Hello,
>
> Does gcc IRA provide a mechanism to support spilling to registers
> instead of the stack? For the particular target I'm looking at,
> there are some non-general-purpose registers that can be copied to
> and from more quickly than the stack, so would be preferable to use
> as a form of shareable spill slot in some cases. One limitation,
> which is perhaps a significant one, is that these registers are not
> callee save, so one would only want to save to and restore from them
> when there is no intervening function call. If there is no current
> support for such a mechanism, any opinions on the value and
> practicality of adding one would be much appreciated.
Not directly. However, I think this should fall out fairly naturally
from the range splitting work I've done.
Dealing with the caller-save issue would be an extension to the existing
work, but one well worth doing. The current model of caller-save.c is
just a PITA to work with. I believe caller-saving can be modeled as a
special case of range splitting.
Vlad's LRA work might help as well.
jeff
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