[Bug middle-end/69454] [6 Regression] ix86_expand_prologue internal compiler error: Segmentation fault

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69454

--- Comment #23 from H.J. Lu <hjl.tools at gmail dot com> ---
(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.