[Bug target/56564] movdqa on possibly-8-byte-aligned struct with -O3

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56564

--- Comment #16 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
On x86_64-apple-darwin10.8 at revision 199935, I get the following failures for
the tests added at revision 199898:

FAIL: gcc.target/i386/pr56564-1.c scan-tree-dump-times optimized "&s" 1
FAIL: gcc.target/i386/pr56564-1.c scan-tree-dump-times optimized "return 0" 1
FAIL: gcc.target/i386/pr56564-3.c scan-tree-dump-times optimized "&s" 1
FAIL: gcc.target/i386/pr56564-3.c scan-tree-dump-times optimized "&t" 1

The optimized dumps are (blank lines removed):

[macbook] f90/bug% cat pr56564-1.c.165t.optimized
;; Function foo (foo, funcdef_no=0, decl_uid=1741, symbol_order=2)
foo ()
{
  <bb 2>:
  return 0;
}
;; Function bar (bar, funcdef_no=1, decl_uid=1744, symbol_order=3)
bar ()
{
  <bb 2>:
  return 0;
}

[macbook] f90/bug% cat pr56564-3.c.165t.optimized
;; Function foo (foo, funcdef_no=0, decl_uid=1741, symbol_order=2)
foo ()
{
  struct S * D.1770;
  long int s.0;
  int _2;
  int _3;
  <bb 2>:
  _5 = __builtin___emutls_get_address (&__emutls_v.s);
  s.0_1 = (long int) _5;
  _2 = (int) s.0_1;
  _3 = _2 & 15;
  return _3;
}
;; Function bar (bar, funcdef_no=1, decl_uid=1744, symbol_order=3)
bar ()
{
  char * D.1769;
  char[16] * D.1768;
  long int _1;
  int _2;
  int _3;
  <bb 2>:
  _5 = __builtin___emutls_get_address (&__emutls_v.t);
  _6 = &*_5[0];
  _1 = (long int) _6;
  _2 = (int) _1;
  _3 = _2 & 15;
  return _3;
}