[Bug debug/104938] Possibly wrong location definition in DWARF with -ftree-cpp at -Og only

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104938

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-03-16
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  With -O it works, if you mark foo noinline the only difference at
RTL expansion is

@@ -25,11 +24,11 @@
   # DEBUG l_3 => &b
   # DEBUG BEGIN_STMT
   # DEBUG e => &l_3
-  a.0_1 = a;

   <bb 3> [local count: 1073741824]:
 f:
   # DEBUG BEGIN_STMT
+  a.0_1 = a;
   if (a.0_1 != 0)
     goto <bb 3>; [89.00%]
   else

that is, the load from a is hoisted out of the loop with -O but not with -Og
which makes the first block empty.