[Bug tree-optimization/117423] [12/13/14/15 Regression] union not written to with particular layout

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117423

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
     Ever confirmed|0                           |1
   Target Milestone|---                         |12.5
             Status|UNCONFIRMED                 |NEW
            Summary|union not written to with   |[12/13/14/15 Regression]
                   |particular layout           |union not written to with
                   |                            |particular layout
   Last reconfirmed|                            |2024-11-03
          Component|middle-end                  |tree-optimization

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.


Before esra:
  rv.DATA.var_0._1 = 2;
  var7 = f2 (arg0_5(D));
  rv.DATA.var_0._0 = var7;
  D.2927 = rv;

After:
  rv$DATA$var_0$_1_17 = 2;
  var7 = f2 (arg0_5(D));
  rv.DATA.var_0._0 = var7;
  MEM <unsigned char> [(struct s2 *)&D.2927] = rv$DATA$var_0$_1_17;
  MEM <long int> [(struct s2 *)&D.2927 + 8B] = rv$DATA$var_1$_1_18(D);


Notice var7 is not copied correctly.