[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 #29 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jakub Jelinek from comment #28)
> 
> Which will likely penalize even code where the stv pass wouldn't do anything.

In normal case it is a nop since the incoming stack is 128-bit
aligned.

> Isn't it better to just disable the stv pass if the stack isn't aligned
> enough
> (like in the #c4 or #c5 patches)?

Ilya, please run your tests with -mpreferred-stack-boundary=2 to see
which approach is preferred.