[Bug tree-optimization/70848] g++ arm-none-eabi ignores volatile qualifier

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70848

ktkachov at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |arm
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |4.9.4, 5.3.1
           Keywords|                            |wrong-code
   Last reconfirmed|                            |2016-04-28
          Component|c++                         |tree-optimization
                 CC|                            |ktkachov at gcc dot gnu.org
     Ever confirmed|0                           |1
   Target Milestone|---                         |6.2
      Known to fail|                            |6.1.0, 7.0

--- Comment #4 from ktkachov at gcc dot gnu.org ---
Confirmed, also doesn't happen on aarch64.
The changes happen at tree-level. 035t.mergephi1 contains

void test() ()
{
  <bb 2>:
  MEM[(volatile int *)327221280B] = 97;
  MEM[(volatile int *)327221280B] = 98;
  MEM[(volatile int *)327221280B] = 99;
  return;
}

but 036t.dse1 contains:

void test() ()
{
  <bb 2>:
  MEM[(volatile int *)327221280B] = 99;
  return;
}