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Subject: [Bug middle-end/52244] [4.5/4.6/4.7 Regression] wrong code for function returning union between int and _Bool at O > 2, with no-early-inlining
Date: Tue, 14 Feb 2012 10:52:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52244

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |jamborm at gcc dot gnu.org
   Target Milestone|---                         |4.5.4

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-02-14 10:51:53 UTC ---
Confirmed, testcase for x86_64-linux:
extern void abort (void);

union U { _Bool b; unsigned char c; };

union U
bar (void)
{
  union U u;
  u.c = 0xaa;
  return u;
}

union U __attribute__ ((noinline))
foo (void)
{
  union U u;
  u.b = 1;
  u = bar ();
  return u;
}

int
main ()
{
  union U u = foo ();
  if (u.c != 0xaa)
    abort ();
  return 0;
}

Started with http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=147980