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

[jakub at gcc dot gnu.org]

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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I need additional -march=x86-64 to trigger this.
I'd say either we have to pessimistically assume what the STV pass might be
doing already during expansion, or the STV pass would need to perform parts of
what expand_stack_alignment is doing (basically check if what the STV pass
created causes any differences in decision during expand_stack_alignment, and
if yes, tweak things so that the end result looks as if those decisions were
done already during the expansion (STV is pre-RA pass, so maybe it still could
work), or maybe easiest fix is for now disable TARGET_STV if
preferred_stack_boundary is smaller than 4.