https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91776
Wilco <wilco at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-09-18
Ever confirmed|0 |1
--- Comment #4 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to yhr-_-yhr from comment #2)
> > I think it's BM2837, ie. Cortex-A53. Or did you mean a different Pi?
> oops you're right, I just got this pointed out when I showed this post to my
> friend. I just copied it from `cat /proc/cpuinfo`.
>
> > Can you try using -mno-strict-it on your examples and see whether that
> > helps?
> Did you mean -mno-restrict-it? I followed gcc's correction info.
Yes - but it looks like your compiler defaults to Arm (which is strange), so it
has no effect.
With GCC8 I can reproduce this for Arm, but not on newer compilers. On Thumb-2
it still is an issue due to -mrestrict-it (comment 1). Basically it shows how
important conditional execution is for performance even on modern CPUs.
