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[Bug middle-end/69454] [6 Regression] ix86_expand_prologue internal compiler error: Segmentation fault
- From: "ienkovich at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 26 Jan 2016 14:01:06 +0000
- Subject: [Bug middle-end/69454] [6 Regression] ix86_expand_prologue internal compiler error: Segmentation fault
- Auto-submitted: auto-generated
- References: <bug-69454-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69454
--- Comment #24 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #23)
> (In reply to Ilya Enkovich from comment #22)
> > (In reply to H.J. Lu from comment #21)
> > > In another word, STV needs 128-bit aligned stack only when it generates
> > > 12-bit vector instructions.
> >
> > STV never generates such instructions. But RA may spill SSE registers and
> > aligned moves are used for that. I actually expected RA to fix-up alignment
> > requirements or even use DI spills/fills (since we never use full register
> > for STV) but it doesn't happen.
>
> RA should be OK. We have addressed all RA issues on Linux when we
> implemented stack realignment. RA should only spill/fill the part
> of registers which is used.
Well, I'll try to just remove alignment code from STV and see what happens.