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Re: Reload bug
> > What you have done is to teach the reload pass to silently transform any
> > non-accessible part of a multi-word register into the low part.
>
> In the case the subreg is undable (ie it is in the SSE), or can this
> happen in the integer register too?
Only when the logic should have triggered, i.e with MMX and SSE regs but not
with general regs since it doesn't trigger for them.
> Or we can backport the CANNOT_CHANGE_MODE_PATCH.
Big patch.
> I would be happy about any alternative for 3.2
Well, there aren't too many possibilities:
- either we prevent such invalid subregs from being created in the first
place (but it appears that doing so brings about collateral damages in the
form of (subreg:SI xmm:DI 0) being now rejected?),
- or we restore the machinery that was able to handle them.
--
Eric Botcazou