[Bug tree-optimization/62006] Bad code generation with -O3 (possibly due to -ftree-partial-pre)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, points-to handles this conservatively, so -fno-tree-pta isn't a real fix
either.  We didn't yet spot the real bogus transform.

But indeed makes sure you are computing differences within one arena only.