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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102892] [12 Regression] Dead Code Elimination
 Regression at -O3 (trunk vs 11.2.0)
Date: Mon, 28 Mar 2022 09:18:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102892

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu.o=
rg
         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=3D0, decl_uid=3D1488, cgraph_uid=3D1,
symbol_order=3D1) (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) !=3D 1)
    goto <bb 6>; [89.00%]
  else
    goto <bb 7>; [11.00%]

  <bb 3> [local count: 715863673]:
  # ivtmp.8_23 =3D PHI <ivtmp.8_24(5), ivtmp.8_7(6)>
  bar ();
  _2 =3D (void *) ivtmp.8_23;
  _1 =3D MEM[(long int *)_2];
  if (_1 =3D=3D 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 =3D ivtmp.8_23 + 4;
  if (_17 !=3D ivtmp.8_24)
    goto <bb 3>; [66.67%]
  else
    goto <bb 7>; [33.33%]

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

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