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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/104381] New: [12 Regression] -gtoggle no longer
 applied when using optimize attribute
Date: Fri, 04 Feb 2022 12:36:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104381

            Bug ID: 104381
           Summary: [12 Regression] -gtoggle no longer applied when using
                    optimize attribute
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

int foo (int x)
{
  int tem =3D x + 1;
  int tem2 =3D tem - 1;
  return tem2;
}

int __attribute__((optimize("no-tree-pre"))) bar (int x)
{
  int tem =3D x + 1;
  int tem2 =3D tem - 1;
  return tem2;
}

with

> ./xgcc -B. t.c -O2 -g -gtoggle -fdump-tree-optimized -c

I get

;; Function foo (foo, funcdef_no=3D0, decl_uid=3D1979, cgraph_uid=3D1,
symbol_order=3D0)

int foo (int x)
{
  <bb 2> [local count: 1073741824]:
  return x_1(D);

}



;; Function bar (bar, funcdef_no=3D1, decl_uid=3D1984, cgraph_uid=3D2,
symbol_order=3D1)

__attribute__((optimize ("no-tree-pre")))
int bar (int x)
{
  <bb 2> [local count: 1073741824]:
  # DEBUG tem =3D> x_1(D) + 1
  # DEBUG tem2 =3D> x_1(D)
  return x_1(D);

}

so -gtoggle is not applied to 'bar'.  This works fine with GCC 11.=