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From: "acoplan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99523] New: Declarations for variable names
 missing in GIMPLE dump
Date: Wed, 10 Mar 2021 17:10:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99523

            Bug ID: 99523
           Summary: Declarations for variable names missing in GIMPLE dump
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

For the following testcase:

int f(__builtin_va_list *ap) { return __builtin_va_arg(*ap, int); }

on AArch64 at -O2 with -fdump-tree-optimized=3D-, we get:

;; Function f (f, funcdef_no=3D0, decl_uid=3D3583, cgraph_uid=3D1, symbol_o=
rder=3D0)

f (struct  * ap)
{
  int D.3591;
  void * D.3592;
  int * iftmp.2;
  sizetype D.3596;
  sizetype D.3597;
  sizetype D.3598;
  void * D.3599;
  int D.3601;
  int * iftmp.3;
  void * D.3607;
  sizetype D.3608;
  int _4;

  <bb 2> [local count: 1073741824]:
  _9 =3D ap_2(D)->__gr_offs;
  _10 =3D ap_2(D)->__stack;
  if (_9 >=3D 0)
    goto <bb 3>; [59.00%]
  else
    goto <bb 4>; [41.00%]

where the variables _9 and _10 are apparently missing declarations in the IR
dump. I believe the variables came from calls to get_initialized_tmp_var in
aarch64_gimplify_va_arg_expr.

Not sure if this is some missing bookkeeping around the gimplification or
perhaps a bug in the dumping code?=