Re: Fix PR24908: ICE in dwarf2out for cpu2000 with -funroll-loops

[Geoff Keating <geoffk at geoffk dot org>]

On 18/11/2005, at 1:40 PM, Richard Henderson wrote:

> On Fri, Nov 18, 2005 at 11:46:25AM -0800, Geoff Keating wrote:
> > The assert is because it's ambiguous; for instance, you can't tell if
> > it's a save of lr in r26, or a restore of r26 from lr.
>
> Not at all; first of all, we don't model restores.

I'm pretty sure we can generate them even in the prolog; you see code  
like

	mflr r12  // save return address in r12
	bl __GLOBAL_OFFSET_TABLE__@local
	mflr r28  // save GOT address in r28 (not frame related)
	mtlr r12  // restore return address from r12

I don't know if this code tries to deal with that or not; maybe we  
just don't mark the save/restore as frame related and hope that no  
trapping operation gets scheduled between the 'mflr' and the 'mtlr'.

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