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

[tkoeppe at google dot com]

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

--- Comment #11 from Thomas Köppe <tkoeppe at google dot com> ---
Created attachment 33240
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33240&action=edit
Further fixing: Uses uintptr_ts for the difference

On Jonathan's suggestion I changed the distance computation to go through a
uintptr_t conversion.

Jonathan suggested compiling with -fno-elide-constructors, and indeed the
attached code breaks when that option is passed. As you said, the UB caused by
the distance computations of automatic objects seems to be the stumbling point.