[Bug rtl-optimization/88770] Redundant load opt. or CSE pessimizes code

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88770

--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> ---
Shouldn't pass_store_merging be better place to handle such optimization?
currently store-merging only merges .a and .b, fails to merge .c and .d

202t.store-merging

void caller ()
{
  struct guu D.4030;
  struct guu D.4029;

  <bb 2> [local count: 1073741824]:
  MEM <unsigned long> [(int *)&D.4029] = 21474836483;
  D.4029.c = 7.0e+0;
  D.4029.d = 9;
  test (D.4029);
  MEM <unsigned long> [(int *)&D.4030] = 21474836483;
  D.4030.c = 7.0e+0;
  D.4030.d = 9;
  test (D.4030);
  D.4029 ={v} {CLOBBER};
  D.4030 ={v} {CLOBBER};
  return;