[Bug target/88656] [7/8/9 Regression] lr clobbered by thumb prologue before __builtin_return_address(0) reads from it

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88656

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-02-08
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |ktkachov at gcc dot gnu.org,
                   |                            |ramana at gcc dot gnu.org,
                   |                            |rearnsha at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Confirmed with -march=armv6-m -mthumb -O2
void baz (void);

void *
foo (void)
{
  asm volatile("" : : : "r8", "r9", "r4");
  return __builtin_return_address (0);
}

void *
bar (void)
{
  asm volatile("" : : : "r8", "r9", "r4");
  baz ();
  return __builtin_return_address (0);
}