[Bug tree-optimization/104010] [12 regression] short loop no longer vectorized with Neon after r12-3362

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104010

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Earnshaw from comment #7)
> Options to reproduce on arm-none-eabi:
> 
> -O3 -mcpu=cortex-a9 -mfpu=neon-fp16 -mfloat-abi=hard -o - vect.c -S
> -fdump-tree-all-details

Can you create a testcase suitable to be put in gcc.target/arm/ with
the required dg- stuff?  Alternatively it would fit in
gcc.dg/vect/costmodel/ but there's no arm specific directory there.