Re: [PATCH] Turn on LRA on all targets

[Segher Boessenkool <segher@kernel.crashing.org>]

Hi!

On Mon, Apr 24, 2023 at 11:46:50AM +0200, Uros Bizjak wrote:
> On Mon, Apr 24, 2023 at 11:19 AM Segher Boessenkool
> <segher@kernel.crashing.org> wrote:
> > We still need someone to test this on alpha now, years later, and give
> > a final okay, but hearing this is encouraging :-)
> 
> Please note that bootstrap worked on alpha*EV6*, not plain alpha.
> 
> Plain alpha is !BWX architecture and uses {un,}aligned_memory_operand
> predicates that call resolve_reload_operand function. Unfortunately,
> this function peeks deep into reload internals (reg_equiv_memory_loc)
> that has no equivalent in LRA. As said in the comment, this internal
> function resolves what reload is going to do with OP if it is a
> register.

Bootstrap works with everything I tried, but building Linux fails with a
few things like
/home/segher/src/kernel/drivers/tty/serial/serial_core.c:1029:1: internal compiler error: maximum number of generated reload insns per insn achieved (90)
(it uses -mcpu=ev5 there; to reproduce just (try to) build a defconfig).


Segher