[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 #32 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #31)
> Maybe we can use HJ's patch from Comment #27 and communicate converted_insns
> flag from convert_scalars_to_vector to ix86_finalize_stack_realign_flags?
> The i_f_s_r function is able to cancel the realignment just before prologue
> generation, when realignment is not needed.

I don't see how it resolves DRAP register problem.  Patch will indicate we need
to realign but won't provide a DRAP for it.  And as I mentioned before it might
be unsafe to allocate DRAP after STV due to tail calls.