[Bug tree-optimization/102892] [12 Regression] Dead Code Elimination Regression at -O3 (trunk vs 11.2.0)

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102892

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu.org
         Resolution|FIXED                       |---
             Status|RESOLVED                    |REOPENED

--- Comment #8 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
The test fails (to link) on SPARC though, here's the .optimized dump at -O3:

;; Function main (main, funcdef_no=0, decl_uid=1488, cgraph_uid=1,
symbol_order=1) (executed once)

Removing basic block 8
Removing basic block 9
Removing basic block 10
Removing basic block 11
int main ()
{
  unsigned int ivtmp.8;
  long int a;
  long int _1;
  void * _2;
  unsigned int _17;

  <bb 2> [local count: 44232128]:
  if (a_9(D) != 1)
    goto <bb 6>; [89.00%]
  else
    goto <bb 7>; [11.00%]

  <bb 3> [local count: 715863673]:
  # ivtmp.8_23 = PHI <ivtmp.8_24(5), ivtmp.8_7(6)>
  bar ();
  _2 = (void *) ivtmp.8_23;
  _1 = MEM[(long int *)_2];
  if (_1 == 1)
    goto <bb 4>; [20.24%]
  else
    goto <bb 5>; [79.76%]

  <bb 4> [local count: 144890806]:
  foo ();

  <bb 5> [local count: 715863674]:
  ivtmp.8_24 = ivtmp.8_23 + 4;
  if (_17 != ivtmp.8_24)
    goto <bb 3>; [66.67%]
  else
    goto <bb 7>; [33.33%]

  <bb 6> [local count: 238597362]:
  ivtmp.8_7 = (unsigned int) &b;
  _17 = ivtmp.8_7 + 8;
  goto <bb 3>; [100.00%]

  <bb 7> [local count: 44232131]:
  return 0;
}