https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80155
--- Comment #22 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Thomas Preud'homme from comment #21)
>
> I can see this behavior for Cortex-M0+ indeed but the results are different
> for Cortex-M7 for me:
>
> <with code hoisting>
> % arm-none-linux-gnueabi-gcc -S ~/cortex-m0plus_reproducer.c -O2
> -mcpu=cortex-m7 -mthumb -fdump-tree-pre-details -fdump-tree-crited
> -fdump-tree-all -funroll-all-loops
>
> % grep push cortex-m0plus_reproducer.s
> push {r4, r5}
>
>
> <without code hoisting>
> % arm-none-linux-gnueabi-gcc -S ~/cortex-m0plus_reproducer.c -O2
> -mcpu=cortex-m7 -mthumb -fdump-tree-pre-details -fdump-tree-crited
> -fdump-tree-all -funroll-all-loops -fno-code-hoisting
>
> % grep push cortex-m0plus_reproducer.s
> push {r4}
>
> Would you mind checking again?
btw, this toolchain was built on 2017-04-04 in case that's the issue.
