[Bug tree-optimization/107910] Missed optimization of struct members with mixed sizes

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107910

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> The problem is an interaction between the SLP vectorizer and store merging.

Supposedly store-merging doesn't consider splitting loads/stores to re-merge
them.  Like with copying

struct StructC __attribute__((packed)) {
  int32_t v00;
  int32_t v01;
  int32_t v02;
  int64_t v03;
  int32_t v04;
};