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

[ienkovich at gcc dot gnu.org]

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

--- Comment #22 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
(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.