[LLVMdev] Double spills with Greedy regalloc

[Borja Ferrer]

No, but after doing it that fixed it, thanks Jakob!

2012/1/27 Jakob Stoklund Olesen <stoklund at 2pi.dk>

>
> On Jan 27, 2012, at 10:20 AM, Borja Ferrer wrote:
>
> > Hello,
> >
> > I noticed the following interesting code sequence while compiling a
> piece of code with the backend I'm developing. Probably this issue is for
> Jakob, but anyways this is what I'm getting:
> >
> >     STDWPtrQRr <fi#12>, 0, %R25R24; mem:ST2[FixedStack12](align=1)
> >     STDWPtrQRr <fi#12>, 0, %R25R24; mem:ST2[FixedStack12](align=1)
> >     STDWPtrQRr <fi#13>, 0, %R23R22; mem:ST2[FixedStack13](align=1)
> >     STDWPtrQRr <fi#13>, 0, %R23R22; mem:ST2[FixedStack13](align=1)
> >     STDWPtrQRr <fi#14>, 0, %R21R20; mem:ST2[FixedStack14](align=1)
> >     STDWPtrQRr <fi#14>, 0, %R21R20; mem:ST2[FixedStack14](align=1)
> >     STDWPtrQRr <fi#15>, 0, %R19R18; mem:ST2[FixedStack15](align=1)
> >     STDWPtrQRr <fi#15>, 0, %R19R18; mem:ST2[FixedStack15](align=1)
> >
> > Each STDWPtrQRr is a spill instruction, but notice that it's spilling
> everything twice to each frame index. I'm only getting this with the Greedy
> regalloc, PBQP will not duplicate the spills.
> > Is there something here that I'm missing or could it be a bug? I haven't
> attached the C code now to not spam the message or the huge debug output of
> the regalloc, but I will supply any information as requested.
>
> Did you implement isStoreToStackSlot() ?
>
>
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